If you’re using Admire Pro + seed treatment, you may or may not need the additional foliar spray. The threshold is two immature thrips per plant, with 25% of the plants injured by thrips. 1 Both species have fairly wide host ranges, feeding on both broadleaf and grass plants, including alfalfa, common bean, grains, grasses, and various weed species. Starting off with a good seed treatment is an excellent way to control insects above and below the ground. The value of the raw cotton and cottonseed produced in the state is worth about half a billion dollars. Although corn thrips are considered an occasional pest, large populations of corn thrips can cause leaves to turn yellow and stunt seedling growth. Be sure to properly identify your pests as thrips before embarking on a mission of thrip control. Cotton aphids scientifically known as Aphis gossypii is a cosmopolitan species broadly distributed in all the cotton growing states of India. We posted an article on how to use the CottonTIP on the ACES website and made a short video with Mr. Eddie McGriff on thrips management. Predatory thrips , green lacewings, minute pirate bugs, mites, and certain parasitic wasps help to control plant-feeding thrips. The Thrips Infestation Predictor for Cotton can be found at https://climate.ncsu.edu/cottonTIP . 1. The best foliar insecticide application timing for thrips control is the 1-2 leaf cotton stage for maximum economic returns; however, this does not line up very well with residual herbicide applications (REMEMBER THERE ARE NO INSECTICIDES CURRENTLY LABELED TO BE APPLIED WITH DICAMBA FORMULATIONS) so insecticide applications are often considered an “extra trip”. lice, feed on cotton plants as secondary pests: the cotton aphid, the cowpea aphid, and the green peach aphid (Fig. Thrips often overwinter on wheat and maturing weeds. 2 thoughts on “ Thrips Control in Cotton ” Richard Jameson says: June 13, 2020 at 8:48 am I just watched Scott Stewart’s YouTube video on thrips control. Extension Weed Specialist & Assistant Professor, Professor of Crop Science & Extension Cotton Specialist, N.C. So where are thrips now? Use a hand lens to look for thrips and inspect fifth trifoliate leaves for feeding damage. As many as 29, 28, and 49 plant families have been documented as feeding host, reproductive hosts, or plants that thrips are transients on for tobacco thrips, western flower thrips, and flower thrips, respectively. Resistance Crop residue and weeds provide an environment for insects, such as thrips, to thrive. either alone or in combination with a nematicide. Thrips can stunt growth and reduce yield potential. Older damage can be misleading. In some situations (high thrips infestations and/or slow seedling growth) supplemental foliar insecticides may be needed in addition to at-plant insecticides. (Optional) 29, 30, and 31). Select 50 plants randomly within a field. It is recommended that specially made blue traps be used, rather than standard yellow traps; the blue traps seem to be more effective and it is easier to see the light-colored nymphs on blue than on yellow. Never pick wet cotton. There are really only two seed treatment options in cotton: neonics and acephate. Keep in mind that these unfavorable growing conditions, when paired with high densities of cotton thrips can wreak havoc on a seedling. Aeris offers growers two effective modes of action against thrips to ensure protection and manage resistance development. While foliar applications after heavy thrips damage will not usually increase cotton yields, early application once thrips are detected can help avoid a negative impact on yield. ©Debra L Ferguson Stock Images Since we aren’t able to have face-to-face cotton scout schools, I have asked Dr. Ron Smith and Dr. Scott Graham to do some YouTube videos with me on cotton scouting and insect control. Soybean thrips also act as a vector for transmission of soybean vein necrosis virus (SVNV) from plant to plant. Always read and follow label instructions. Cotton Thrips Control Numerous Factors affect Thrip pressure and management. Thrips are the smallest of all cotton insect pests with an overall body length of less than one-twelfth of an inch. Many small predators such as predaceous thrips, minute pirate bugs, and spiders feed on thrips. I would suggest this video be saved and shown at the 2021 Cotton Focus to remind growers to take thrips control seriously. Thrips can be found in corn throughout the growing season. Many species of thrips (in the insect order Thysanoptera) infest corn, soybean and cotton crops. Not all products are registered for use in every state. in this video you will know about the best available chemicals to control most dangerous pest of cotton crop. Look for thrips and feeding symptoms on upper and under leaves, especially between leaf veins. Adult thrips migrate into field corn in the spring and early summer. They also superficially resemble some other thrips species that, if mistaken, may result in poor control because the insecticides selected may not be efficient against chilli thrips. Heavy populations of thrips can migrate from nearby weeds and crops, especially wheat. NC State Extension is the largest outreach program at NC State University. Feeding thrips strike cotton leaves and terminal buds. Currently, these pests are resistant to several insecticides, resulting in fewer options for economically viable management. So, it was a surprise to University of Georgia Extension Entomologist Phillip Roberts when he found out some farmers looking for ways to cut input costs were not protecting the crop from thrips. Also remember that tank mixes to control both weeds and thrips can reduce application costs. Control. If one product does not seem to be working, try a different insecticide. Follow IPM guidelines for cotton and always rotate insecticides with different modes of action to effectively manage insecticide resistance in combination with other control practices. For information on a portfolio of products from Bayer that help cotton growers maximize yields and protect their crops, contact your local Bayer representative. Always read and follow label instructions. After the third or fourth leaf stage, cotton plants should be in a vigorous growth mode and relatively secure from thrips yield damage. Avoid planting cotton during cool conditions so that young plants will not be affected when plants are most susceptible to thrips damage. The site may not look or function as expected. Background: Plant bugs (Lygus spp.) The wide range of alternate hosts, especially continuous production of Most soybean thrips develop from egg to adults in 10 to 30 days, depending upon air temperatures. This is a useful tool for predicting whether a foliar insecticide application is needed for thrips control in cotton. If cotton is treated with a systemic insecticide at planting, it should be scouted for thrips … The best approach to managing thrips and other cotton insects is preventative control. Types of Cotton Sucking Pests - Its Management & Control Cotton Aphids. Using the Thrips Infestation Predictor for Cotton. Read our Commitment to Diversity | Read our Privacy Statement. The boll weevil arrived in the state that year and acreage dropped until the weevil was eradicated in the late 70s and early 80s. Some situations may require supplemental insecticide treatment for boll-worm and fall armyworm. They interrupt reproduction and reduce local populations leading to less adults and resulting damage. Thrips are staking claim as the No. Several options are available to control thrips can be found in the Alabama Cotton IPM Guide. Seven species of thrips were found. Plant Date: In general, earlier plantings equal higher Thrips pressure and damage. The best approach to managing thrips and other cotton insects is preventative control. Adults mate, and females inject eggs into young corn seedling tissue. Management Chemical Control. Thrips can be found on numerous crop and weed species, many of which are found within cotton production environment. Concentrate your attention to live yellow immature thrips in terminals. During the larval stage, many of them also live in the same habitat, but in mos… Severe thrips injury on untreated cotton. Cultural Control. Want to see which lists are available? Install blue sticky traps to attract and catch thrips. They may develop high populations in cotton grown near corn and small grains such as wheat. Curtis Fountain, Duplin Co. agent, put it well. Thus, seed or foliar-applied chemical insecticides are typically required to protect cotton from these pest groups. For greenhouse vegetable crops, Orius is most successfully used on peppers and cucumber. Stunted plants can result from thrips feeding, which destroys plant cells and causes crinkled leaves that curl upward. There are a few other pests that can do damage that will look similar to that of thrips, including mites and lacewings. Secondary pests, such as aphids, become a serious problem when broad-spectrum insecticides targeted at primary pests disrupt natural control. Adult corn thrips appear black in color, while immature thrips are lighter in color and smaller in size. Depending on the location, thrips may be behind 2-3 weeks from “normal” in 2014. Consider the extent of crop damage. infection and disease, resulting in ear rot. Annually, thrips are problematic in early panted cotton and peanut. Avoid treating for revenge. No more than 2 ½ to 3 weeks activity can be expected with an insecticidal seed treatment alone. All thrips inhabit secluded areas on plants, such as unopened flower and terminal buds, which reduces exposure to insecticide applications. Dimethoate 4E at 4 – 8 oz product per acre (6 oz is usually the x – rate) Radiant SC * – 1.5 – 3.0 oz product per acre. Chemical Control and Action Thresholds. Thrips infestations in cotton vary by location, planting date, and year. Vigilance — spotting problems early … The threshold for thrips is 2-3 thrips per cotton plant with immatures present. They leap or fly away when disturbed. 1 cotton pest in west Tennessee. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. Typically, thrips themselves do little damage, but they create penetration into corn kernels that allows Fusarium spp. Baythroid® XL insecticide, a pyrethroid, performs on a broad spectrum of insect pests, with fast knockdown and long residual control. Reports of thrips damage on cotton with an insecticidal seed treatment and/or in-furrow neonicotinoid (Admire Pro) have increased over the past week. In this case, separate trips over the field should be made. At-plant insecticides for thrips control provide a consistent yield response. Eggs hatch in about six days after the female thrips’ sharp laying tube inserts them into cotton plants. NC State Extension Research Specialist Dr. Dominic Reisig addresses thrips control in cotton as a part of the CHROME Regional Ag Expo. Thrips are some of the most damaging insect pests to the leaves of onions world-wide. What separates NC State University from other schools? A saturated stand will not grow well and will be more at risk for thrips. The same thing that connects it to every corner of North Carolina: NC State Extension. Corn during the seedling and ear development stage are most vulnerable to thrips injury. Moist soil does not equal saturated soil. Cotton plants are most likely to be harmed by thrips from emergence to the third or fourth leaf stage. The disease is a relatively new soybean threat; it was first detected in 2008 in Tennessee. Outside of cannabis, thrips’ favourite crop seems to be cotton, although they can damage many kinds of crops. In general, they are not host specific; however; species such as onion thrips and tobacco thrips feed on plants in specific families. One of the universal components found in each states management of pests in cotton, is to scout which bugs are present. Usually, soybean seedlings will outgrow thrips injury, and an insecticide treatment is not needed. 1). Right now, it is so dry that thrips pressure might not be as much as in previous years. At-plant insecticides for thrips control provide a consistent yield response. They rarely exceed 0.4 to 0.6 inches in length, depending on the species and the crop they infest. Adult thrips are usually brownish or almost black in appearance and have wings (depends on species, tobacco thrips is the most common thrips species infesting cotton and adults will be dark brown or black). However, we can’t control thrips unless we use a combination of seed treatments, foliar … Despite their small size, these insects have the potential to cause yield reductions of more than 100 pounds of lint per acre; extremely heavy infestations can even cause death of seedling plants. Bidrin 8E at 2 – 3.2 oz product per acre. Chemical efficacy varies by species of thrips being treated. Long-term research indicates thrips are best controlled early with a pre-applied seed treatment, an insecticide applied in-furrow at planting or a foliar insecticide applied as needed after seedlings emerge. However, we need to be prepared because thrips move around and can infest fields.” Cotton can be protected with an insecticide seed treatment, an in-furrow application, and/or a foliar spray. Once seedlings reach the 4-leaf stage and are growing rapidly thrips are rarely an economic concern. The best approach to managing thrips and other insects in soybeans is preventative control. Baythroid XL is a Restricted Use Pesticide. But they really seem to love cannabis! Cotton has been important to North Carolina for many years, both in agricultural production and in the textile industry. An Insecticide to Control Thrips. Hang hole-punched, rectangular adhesive cards around your garden or greenhouse. After removing the adhesive backing paper, use a plastic tie to knot and secure each sticky sheet near any vents, doors, or other openings that a thrips bug could pass through. How to control scale & thrips: 1) Predators. This obviously isn’t a viable solution for your houseplants! DAMAGE TO ONIONS. Foliar application timing for thrips is most effective when cotton is between the expanded cotyledon to first true leaf stage (see photo). There is a predatory mite which controls thrips. Not all products are registered for use in every state. If you’ve used a seed treatment or the Admire Pro at-plant + seed treatment combination, keep in mind that residual begins to decline as soon as seed is planted. In the winter months, they prefer to be on the ground or under plant debris. The presence of numerous immature thrips suggests that the at-plant insecticide is no longer providing acceptable control (i.e. This might be mites or lace bugs. UT recommends the following insecticides: Acephate or Orthene (90 or 97%) at 0.20 – 0.25 lbs product per acre. Immature thrips are lighter in color, while adults will have two pairs of wings. Cotton seedlings are most susceptible to thrips during early stages of development (cotyledon thru 2- leaf). Send Explanation. Thrips damage on cotton leaves — photo courtesy NCSU Cotton Scouting Guide Thrips are the most consistent pest in cotton each year. However, under adverse growing conditions, a foliar treatment may still be necessary. Also remember that tank mixes to control both weeds and thrips can reduce application costs. Adults range in color from black to yellow. On the other hand, in the summer and spring, they are usually in trees, flowers, and fruits. It appears you don't have javascript enabled. Chemical Control of Cotton Thrips Seed treatment with imidacloprid 60FS @ 10 ml/kg OR thiomethaxam 70 WS @ 5 g/kg seeds. Because most tobacco thrips populations are resistant to the neonicotinoid-group insecticide seed treatments, there has been a lot of renewed interest in different at-planting insecticides. However, a tank mix prioritized for weed control applied after the first or early second true leaf stage may expose the seedlings to significant thrips damage. Physical/Mechanical Control. Entomologist, Lubbock; currently Louisiana State University Ag Center Associate Professor and
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