When To Spray For Bagworms In Kansas

Gudenkauf Transplanting carries a commercial Pesticide Applicator Certification to spray and treat trees. A bagworm clings to an evergreen tree in downtown Lawrence on Tuesday, August 19, 2008. The most commonly attacked host plants are arborvitae, cedar and other juniper species, black locust, maple, and sycamore. So theoretically, a person might yet (at this late date) consider spraying for bagworms. For those of you that have been waiting patiently or for some…impatiently; it is time to 'get ready' to spray for bagworms. You Don't Need a Dog to Need Flea and Tick Treatment. Because as their name implies, the larva live in bags. Proper coverage is important for good control. For use in the vegetable garden, lawn, and flower bed. A fellow, walking his dog, asked if I knew some of the evergreens had bagworms. There are nearly 500 insecticides labeled for bagworm control in Kansas so it is less important. Bagworms are caterpillars that feed on the foliage of plants such as conifers, junipers, oaks and arborvitae. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. On a related note, it's not uncommon for small twigs to die from the constriction of the old bagworm fibers 2 or 3 years after the bags are attached. Before we can dive into how to control bagworms we must first talk about their life cycle. So, tiny larvae already are chowing down on deciduous plants. We spray bagworms in June, July and August. Bagworms feed primarily on evergreens like Junipers, Spruce and Arborvitaes. They are fastened to the tree. Also, make sure to eliminate as much yard debris as possible, such as leaves and branches. Bagworms can be controlled by spraying the foliage with. Spraying is crucial for residents in keeping bagworms away, and Otte emphasized that how you spray has more of an effect than what product you are spraying. Tree Health Care Services in Kansas City. Bagworms on spruce. Bagworm can be found on numerous trees and shrubs but especially junipers and arborvitae. Once absorbed, it moves up through the tree or shrub, providing year-long protection even into new growth. The first spray application would be from late-May through mid-June and the second following 2 to 3 weeks later in mid-June through the first week of July. Bagworms are. Bagworms are caterpillar larvae that feed on the upper skin of leaves, leaving behind brown spots and weakening plants. Big Bad Bag Worms and How to Kill Them | Life and Lawns - 39 Responses to "Big Bad Bag Worms and How to Kill Them" Lawn Moths, Sod Webworms, and How to Control or Eliminate Them | Life. The bagworms must go. Bagworms are the little pine-cone-shaped-cocoon-forming garden insect that can defoliate an entire evergreen tree or shrub in one season. They may also be among the least well controlled. The most commonly attacked host plants are arborvitae, cedar and other juniper species, black locust, maple, and sycamore. recommend spraying twice. per 100 gal. The insect begins its life as an egg laid by a female moth that never leaves her bag. He also is. spray your junipers for bagworms. Gardenality is a gardening-centric site made by gardeners for gardeners with tools that enhance any gardening for the expert to the weekend gardener. However, again, thorough coverage of all plant parts, especially the tops of trees and shrubs, where bagworms commonly initiate feeding, and frequent applications are required. com lets you build virtual gardens, share your gardening pictures, rate gardens, take gardening quizzes, search for plants by attribute such as type, soil, sun, water needs, plus hundreds more, and has hundreds of helpful articles. October 15, 2019. Host Plants. Jarrin came out. The topic this week is bagworms. Most years, we spray for them in the third week of June, but it is best to spray when they are just forming until they are no larger than one inch in length. These larvae are only 1/25 of an inch long. If the outbreak is severe, a second application may be required. It's an infestation of fall webworms. If they feed on your plant over a period of several years, they can cause enough stress to kill it. In Kansas, May is when we typically see young bagworms hatch and begin feeding on trees and shrubs. Now Is Time to "Nail" Those Bagworms It is now time to "do battle" (I love military metaphors) with that "infamous" of insect pests known as the bagworm (Thyridopteryx ephemeraeformis). Bagworms 5/22/18. Sevin dust is most effective before the bagworms (Psychidae family) exceed lengths. Because as their name implies, the larva live in bags. Before we can dive into how to control bagworms we must first talk about their life cycle. Bagworms — Continue to spray for bagworms if you have a lot of them on trees or shrubs. K-State Research and Ex-tension, based at Kansas State University in Manhattan Kansas, offers programs,. First noted in the Wichita area, young larvae will soon be hatching. Bagworms overwinter as eggs inside the dead female's bag. In Kansas, May is when we typically see young bagworms hatch and begin feeding on trees and shrubs. 99 For Your First Month Get full access to The Wichita Eagle content. Olathe, Kansas (May 28, 2010)--Bagworms are among the most recognized tree and shrub pests. Yes, Sevin kills bagworms. Blooming flowers and healthy grass are signs of one of the best months for gardening in Kansas. The most commonly attacked host plants are arborvitae, cedar and other juniper species, black locust, maple, and sycamore. Is there any pesticide or fertilizer that can be used to cure and prevent this problem?. They may also be among the least well controlled. To help you defend your family, pets, and home, here are the answers to a few frequently asked questions from Custom Lawn & Landscape about flea and tick lawn treatments. Watch for an article on when and what to spray a bit later in the season. The bagworm can be a constant threat to many green and deciduous shrubs used for landscaping in the Kansas City area. Occasionally, bagworms are found on trees and shrubs that are not conifers. They're not some kind of seed or early. Bagworm Bagworms attack both evergreens and de-ciduous trees and shrubs but prefer to consume arborvitae, cedar, juniper, and other evergreens. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. Bagworms and Webworms When the long hot days of summer are upon us, many residents in the Town of Flower Mound begin to notice bagworms and fall webworms afflicting trees throughout town. Department of Agriculture Forest Service. Dear Meadowlark Extension District Patrons, We hope you enjoy our summer edition of the Meadowlark Extension District Newsletter produced by your District Extension Agents. Complete fruit tree spray concentrate containing Captan 12%, Malathion 6%, Carbaryl. These larvae are only 1/25 of an inch long. Treatment For Bagworms - Is there a simple way to treat bagworms? I have heard that a spray with Dawn dish-washing soap might work. They may also be among the least well controlled. "In Kansas, for example, bagworms typically hatch in late May or early June. Natural Guard Spinosad Ready-to-Spray controls bagworms, spider mites, tent caterpillers, and other chewing insects. Compare Homeowner Reviews from Top Kansas City Treat, Protect and Maintain Trees and Shrubs services. Our total vegetation management program eleminates all types of vegetation in prescribed areas for residential, commercial, ind ustrial, and right of way areas. Hire the Best Tree and Shrub Maintenance Companies in Kansas City, MO on HomeAdvisor. A bagworm clings to an evergreen tree in downtown Lawrence on Tuesday, August 19, 2008. There are reports that because Talstar also kills benificial mites, it can therefore lead to an increase in the population of "bad" mites. The sacks are commonly mistaken for small pinecones as they hang from the underside of plant foliage. Bagworms are difficult to control when they are that large. This is the time of year that they are the most visible since the identifying bag that they will overwinter. A fellow, walking his dog, asked if I knew some of the evergreens had bagworms. However, make sure you have living bagworms as sometimes natural predators and parasites provide good levels of control. Bagworms life cycle are differentiated into separate stages, much like any other organism. Choose one that kills both the adults and eggs. So, now is the time to take action against this insect pest. That's when you need to start inspecting closely for signs of activity," he said. Picking bagworms from trees can be a. Unlimited Digital Access: Only $0. They emerge in late spring to early summer, spinning protective cases of silk and foliage around themselves. I'd put this on the plant/tree forum, but a lot of people homesteading have windbreaks or evergreens and maybe aren't looking for bagworms or are. Our total vegetation management program eleminates all types of vegetation in prescribed areas for residential, commercial, ind ustrial, and right of way areas. I had piled up some limbs on the burn pile, with bag worm nests on them the other day. Apply when larvae begin to hatch and spray larvae directly. Bagworms are primarily a pest of conifers but have expanded their host range to include a number of broadleaf plants, such as rose. When to Spray Bagworms bil hir. The larva is also transported to nearby plants by wind. Spray the bagworms while they are still actively eating, for the best control. References: 1. Bagworms are the little pine-cone-shaped-cocoon-forming garden insect that can defoliate an entire evergreen tree or shrub in one season. When it comes to pine trees, their sacks are mistaken for actual small pine cones. Bagworms feed on just about any plant but seem to favor the evergreens. If you can't wait, we do have an article on bagworms. Brings in the woodpeckers and flickers, which not only like suet but bagworms too!. I expected that they not having a food source they'd die right away. An advantage of B. Bagworms, K-State Research and Extension, Entomology Publication MF728 2. EG's require more spray for complete coverage compared to deciduous trees, so more product is needed. The female dies shortly after depositing the egg mass. What to Spray for Bagworms. a single spray in late June to early July may be all that is needed. It is a great, nontoxic to birds and fish. Make sure when spraying to get the underside of the leaves and branches. erpillar pests in Kansas are bagworm, mimosa webworm, cankerworm, and fall webworm. Insecticides must be applied with sufficient sprayer pressure, and in adequate amounts of water carrier to ensure penetration of dense foliage. Bagworms are native to North America and can be found feeding on many landscape bushes, evergreens and trees in Kansas City, but seem most fond of arborvitaes, junipers and spruces. On a related note, it's not uncommon for small twigs to die from the constriction of the old bagworm fibers 2 or 3 years after the bags are attached. If you have never seen bagworms on your junipers it doesn't mean you are out of. A: Most bagworms have finished feeding and retreated into their bags by mid-August. However, if you have had problems in the past with bagworms we always recommend a preventative treatment using Tanglefoot insecticide. Bagworm eggs over winter as eggs inside old bags. The larva is also transported to nearby plants by wind. It is time to get ready to deal with that infamous insect pest known as the bagworm (thyridopteryx ephemeraeformis). Proper coverage is important for good control. If you had bagworms on junipers or cedars last year, even if you think you controlled them, spray again this year. Precious regrowth needs to be protected. THOROUGH SPRAY COVERAGE TO FOLIAGE IS ESSENTIAL FOR CONTROLLING BAGWORM! Controls applied in August are often a waste of time and expense because the larvae are large, tough and may have stopped feeding. Bagworms overwinter as eggs inside the dead female's bag. and it is difficult to keep the spray off of those surfaces when spraying even smaller trees. Although you can pick up the nuts by hand and place them in a bucket, specially made pecan rakes or harvesters can simplify the task. Therefore, Spray #1 should be applied during the first week or week and a half into June for the purpose of eliminating those bagworms which emerged early during the hatching period. The determining factor would be based upon the condition and appearance of the host and the number of bagworms still actively. Kansas Insect Newsletter For Agribusinesses, Applicators, The normal recommended "treatment window" for applying insecticides to control bagworms is during the last Bagworms currently are of sufficient size for easy detection. Bagworms are. For Kansas City Tree Health Care call K. When Should I Spray for Bagworms? By Donald Lewis, Department of Entomology There has been considerable interest and worry in the southern half of Iowa this spring as homeowners and property managers start thinking ahead to whether the bagworm caterpillars will defoliate their spruce, cedar or arborvitae trees again this summer as badly as they. Spray Bagworms Our 5 Step Fertilization & Weed Control Process Our five step program for fertilizing a lawn adds the proper nutrients in the required amounts and at the proper time. ready-to-use hose end sprayer. Then, inspect the branches on your infested tree and use clippers to cut off any egg sacks you find so they fall into the soapy water. Over the past few weeks, I have been receiving many calls about bagworms in area trees. Bagworms (Theridopteryx ephemeraeformis) are moth larvae that feed on various deciduous and evergreen bushes. In addition, Pioneer Bagworm Spray is absorbed by the leaves and moves in the sap stream to all parts of the plant (systemic action). Bagworms feed on just about any plant but seem to favor the evergreens. Lawn Care - Kansas City Northland. On deciduous trees, bagworms will strip the leaves, leaving only bare branches. Bagworms are easily recognized. Most years, we spray for them in the third week of June, but it is best to spray when they are just forming until they are no larger than one inch in length. So, tiny larvae already are chowing down on deciduous plants. THOROUGH SPRAY COVERAGE TO FOLIAGE IS ESSENTIAL FOR CONTROLLING BAGWORM! Controls applied in August are often a waste of time and expense because the larvae are large, tough and may have stopped feeding. Typically, we see bagworm infestations on evergreen trees and shrubs, especially juniper and arborvitae, with an occasional bagworm on a different host plant. It is hard to give a specific date or time of year when we should spray for bagworms, they are dependent on the environment so every year is a little different time. Scout other. Eggs hatch and the larvae leave the bags and then begin feeding and constructing their bags. Bagworms, K-State Research and Extension, Entomology Publication MF728 2. Is it too late to spray them?. In addition, Pioneer Bagworm Spray is absorbed by the leaves and moves in the sap stream to all parts of the plant (systemic action). Rick Jacobs, owner of. Once the eggs hatch, the larva spins a silk strand that hangs down it. I'd put this on the plant/tree forum, but a lot of people homesteading have windbreaks or evergreens and maybe aren't looking for bagworms or are. Also, make sure to eliminate as much yard debris as possible, such as leaves and branches. Females resemble grubs and can't fly. Male bagworm moth Figure 4. per 1,000 square feet (or 5. Now Is Time to "Nail" Those Bagworms It is now time to "do battle" (I love military metaphors) with that "infamous" of insect pests known as the bagworm (Thyridopteryx ephemeraeformis). In large numbers, they can defoliate and kill juniper, spruce, and arborvitae trees. Oils can damage surfaces of houses, lawn furniture, vehicles, swing sets, etc. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. Many chemicals are available to control bagworms. It is time to get ready to deal with that infamous insect pest known as the bagworm (thyridopteryx ephemeraeformis). October 15, 2019. The Absolute Best control for Bagworms is FL Borer, Bagworm, Tent Caterpillar & Leafminer Spray which is now called Natural Guard Spinosad. from Hutchinson, Kansas Messages: 5,855 Ok, I know it's early to think about bagworms already, but I was wondering what some of you that do that type of ornamental spraying are using for those nasty things. They're not some kind of seed or early. In reading our local paper this afternoon, I came across an article by one of the area Extension agents on bagworms ( Thyridopteryx ephemeraeformis ). Proper coverage is important for good control. I've been receiving questions regarding when to spray for bagworms. Lawn Care - Kansas City Northland. Bagworms are one of the most damaging pests to evergreens in Kansas. As the bags become larger control is more difficult. This is the time of year that they are the most visible since the identifying bag that they will overwinter. Blooming flowers and healthy grass are signs of one of the best months for gardening in Kansas. Jarrin came out. "And they are in full force. We are licensed to spray lawns, trees, bare ground and homes for insects. It's an infestation of fall webworms. The most commonly attacked host plants are arborvitae, cedar and other juniper species, black locust, maple, and sycamore. Although you can pick up the nuts by hand and place them in a bucket, specially made pecan rakes or harvesters can simplify the task. Time and timing are both important, according to Dennis Patton, horticulturist with Kansas State University Research and Extension. If the infestation was heavy last year, the initial spray should be done as soon as the small larvae are noticed and a second time two to three weeks later. Bagworms are native to North America and can be found feeding on many landscape bushes, evergreens and trees in Kansas City, but seem most fond of arborvitaes, junipers and spruces. Even though both insects have the word worm as part of their common name, they are actually caterpillars. Again, it is best to treat bagworms while still. The bagworm has been recorded on 128 different plant species in various parts of the United States. Thorough spray coverage of all plant parts, including tree tops and surrounding shrubs, in multiple applications, is essential in keeping bagworm populations at bay. Bagworms and Webworms When the long hot days of summer are upon us, many residents in the Town of Flower Mound begin to notice bagworms and fall webworms afflicting trees throughout town. The BT products have low mammalian toxicities but are only effective against younger larvae. Squirrels and moisture can ruin an entire nut harvest if you don't get them off the ground quickly. among three killed in Kansas. I suggest looking over your spruce, arborvitae, and junipers which includes the eastern redcedars for bagworms. A two-spray schedule is recommended in situations where the previous season's bagworm activities caused serious damage. Birds, insect parasites and insect predators are natural enemies of bagworms. They may also be among the least well controlled. Bagworm Control. Time and timing are both important, according to Dennis Patton, horticulturist with Kansas State University Research and Extension. In Kansas, May is when we typically see young bagworms hatch and begin feeding on trees and shrubs. The insect begins its life as an egg laid by a female moth that never leaves her bag. So, tiny larvae already are chowing down on deciduous plants. , said Graham Herbst, a forester with the Nebraska Forest Service, is that it's a bacterium that targets the bagworm specifically. Bagworms, Thyridopteryx ephemeraeformis, are emerging from eggs, and the young caterpillars are out and- about feeding on plants. The bagworm is an insect native to the United States and is common in eastern Nebraska. Spray with sufficient pressure and in adequate amounts of water carrier to ensure penetration of dense foliage. October 15, 2019. "We hadn't had bagworms in over 25 years then all of a sudden - boom - they're here," said homeowner Don Norton. Do I Need To Spray For Bagworms? Time To Start The Fall Garden June 24-30, 2019 Mosquito Control Blossom End Rot Why No Squash? Tomato Leaf Curl Squash Bugs June 17-23, 2019 Bagworms Throw The Calendar Out The Window Easy On The Fertilizer Grasshoppers Bristly Rose Slugs June 10-16, 2019 Dead Head Peonies Prune Lilacs Treat For Bagworms Why. Applications when larvae are young will be most effective. The best defense against bagworms is an insecticide spray application. pdf) Bagworms have become an increasing problem in Lancaster County, Nebraska and surrounding areas. These little cocoons or sacks may have anywhere from five hundred to a thousand eggs, which hatch in the spring. Bird predation and insect parasitism can help keep bagworm outbreaks brief. Unlimited Digital Access: Only $0. Bagworms are Back! It is the time of year you have all been waiting for, that is, dealing with that "infamous" of insect pests known as the bagworm (Thyridopteryx ephemeraeformis). On deciduous trees, bagworms will strip the leaves, leaving only bare branches. Bagworms are caterpillars that feed on the foliage of plants such as conifers, junipers, oaks and arborvitae. OVERVIEW Note: Please note that insects do not adhere to man-drawn borders on a map and as such they may be found beyond their listed 'reach' showcased on our website. Bagworms will eventually be out and about, feeding on trees and shrubs; both broadleaf and evergreen. Bagworms survive the winter as eggs within the bag of the adult female. Bagworms do not create the large webby masses on the ends of tree. Scout other. They are much easier to kill while small. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. It is time to get ready to deal with that infamous insect pest known as the bagworm (thyridopteryx ephemeraeformis). I have developed a problem with bagworms on my arborvitaes and Leyland cypress trees. Bagworms are native to North America and can be found feeding on many landscape bushes, evergreens and trees in Kansas City, but seem most fond of arborvitaes, junipers and spruces. He also is. EG's require more spray for complete coverage compared to deciduous trees, so more product is needed. Once the worms have emerged, you will need to spray a week or so later, before the worms get too big and are more difficult to kill. Here is a glimpse into the various Bagworm life stages - The eggs of Bagworm moths hatch in end of May and beginning of June. Bagworms — Continue to spray for bagworms if you have a lot of them on trees or shrubs. For many areas in southern Iowa ("bagworm territory"), it is now too late to treat for bagworms. We likely still have a lot of eggs to hatch. Throughout most of Kansas, bagworm eggs have hatched and the young caterpillars are out-and-about feeding on both broadleaf and evergreen trees and. References: 1. Use an insecticide such as permethrin, spinosad or trichorfon, according to the University of Illinois. Evergreen Bagworms attach their bags mainly to evergreen trees making it look like pinecones. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. Bagworms survive the winter as eggs within the bag of the adult female. After that, insecticides are ineffective because they cannot reach the pest. This segment discusses several ways to control bagworms. D's Notes 05-13-19 Bagworms Young bagworms normally hatch in May in Kansas and initially are about 1/25 of an inch long. I expected that they not having a food source they'd die right away. Bagworm moths make their homes in many types of trees, especially cedar trees. Scout other. They are much easier to kill while small. Is it too late to spray for bagworms? That's a good question, and will require some close observation on your part. Bagworms are easy to kill if you spray in June. Secondly, we hang up lots of suet feeders. written by Our State Staff One of the most destructive landscape pests is the bagworm. Unfortunately, so do bagworms. Picking bagworms from trees can be a. I'd put this on the plant/tree forum, but a lot of people homesteading have windbreaks or evergreens and maybe aren't looking for bagworms or are. Our total vegetation management program eleminates all types of vegetation in prescribed areas for residential, commercial, ind ustrial, and right of way areas. Opportunities in Biology - K-State Division of Biology 103 Ackert Hall. So, now is the time to take action against this insect pest. I was wondering if there is a product we could spray to prevent the bagworms and not harm the trees. Is it too late to spray them?. OLATHE, Kan. If this is the case, you are probably wondering about bagworm control. Kansas' bagworm hatch typically begins in mid to late May and continues through mid to late June. Bag worms aren't any worse here this year than normal. Bagworms feed on just about any plant but usually favor the evergreens. Kansas State Air Force ROTC Kansas State University 108 Gen Richard B Myers Hall. Before we can dive into how to control bagworms we must first talk about their life cycle. Here's what we do and it seems to have kept them problem to a minimum. Otte distributed little pamphlets detailing bagworms so residents can have better luck in being able to identify them around their yards, and dissuade them in preventing plants from. Young larvae normally hatch and emerge during mid- to late-May in Kansas. Thorough spray coverage of all plant parts, including tree tops and surrounding shrubs, in multiple applications, is essential in keeping bagworm populations at bay. Also, make sure to eliminate as much yard debris as possible, such as leaves and branches. In Kansas, bagworms normally finish feeding and close their bags during mid-August. Bagworms are commonly found from the Atlantic states westward into Texas, Oklahoma, and Kansas and. Talk about "personality", lol! Great reminder to keep your horses fly free this season with a large selection of fly deterrents available at both our Andover and Maize Woodard Mercantile locations. I did, but I invited him to pick them off if he liked, as I had been told long ago in my garden club that this late in the summer, when the worms. Bagworm life stages are successful drop to the Figure 3. DoMyOwn's selection fo bagworm control products will help stop this damage for strong healthy plants. Bagworms Host: In Oklahoma the most common hosts are eastern red cedar, other junipers, and arborvitae. I suggest looking over your spruce, arborvitae and junipers, which include the eastern redcedars, for bagworms. Evergreen Bagworms attach their bags mainly to evergreen trees making it look like pinecones. But I do try to chop any branches when I see them. How do I control bagworms? Physically remove bags from trees during the winter. Kansas' bagworm hatch typically begins in mid to late May and continues through mid to late June. Therefore, now is the time to initiate action against bagworms once they are observed on plants. Apply a thorough covering of the spray mixture to soak the small developing bags for best results. Applications when larvae are young will be most effective. The insect begins its life as an egg laid by a female moth that never leaves her bag. The bagworm is an insect native to the United States and is common in eastern Nebraska. OLATHE, Kan. If this is the case, do not spray the tree. The spindle-shaped bags reach about 2 inches in length by summer's end, when they. Bagworms, Thyridopteryx ephemeraeformis, are emerging from eggs, and the young caterpillars are out and- about feeding on plants. Bagworms are primarily a pest of conifers but have expanded their host range to include a number of broadleaf plants, such as rose. Females resemble grubs and can't fly. "In Kansas, for example, bagworms typically hatch in late May or early June. Spray the exterior of your home with a residual insecticide every 30 to 90 days to keep roaches out. A fellow, walking his dog, asked if I knew some of the evergreens had bagworms. Kansas Insect Newsletter August 26, 2011 No. Occasionally, bagworms are found on trees and shrubs that are not conifers. It is found in warm, humid climates throughout the Americas although the exact range is difficult to. But I do try to chop any branches when I see them. K-State Research and Ex-tension, based at Kansas State University in Manhattan Kansas, offers programs,. The larvae, pupae and adult females live inside their bag-shaped havens — thus the name bagworm — which the insects construct of leaves, needles, twigs and silk, according to the U. The BT products have low mammalian toxicities but are only effective against younger larvae. If this is the case, you are probably wondering about bagworm control. K-State Research and Ex-tension, based at Kansas State University in Manhattan Kansas, offers programs,. The visible sign that you have an infestation of this pest is the presence of light brown cocoon like bags that are covered with what seems to be juniper needles (3. Q: I have dozens of bagworms on my spruce. We specialize in treating the following pests and diseases. No, we're not talking about pests like those annoying kids down the street (don't worry, we've seen them too) - we're talking about the ones that eat and destroy the plant life around. Most years, we spray for them in the third week of June, but it is best to spray when they are just forming until they are no larger than one inch in length. Bagworms are actually caterpillars that live most of their lives inside web. Bagworms also wrap silk around the twigs they build their bags on, which could kill the tree twigs a few years from now. How to beat a bagworm By Tracey Fitzgibbon / For the Journal. Only when actively feeding are bagworms vulnerable to insecticide sprays. For larger bags, handpicking them off the plant is the best method of removal. If you have a bagworm-infested tree, pull off as many bags as you can for a quick inspection. Lawrence, KS - infoZine - Their timing sets the schedule for three possible control strategies - one of which. Bagworms on spruce. If you leave them until they have tied their bags around the twigs you will have a much more difficult time controlling them. Many chemicals are available to control bagworms.