Therefore, preventative use of seed treatments is a standard practice and is very appropriate. 1 pest of seedling cotton. Active ingredients available for thrips are acephate (not a neonicotinoid), clothianidian, imidacloprid, or thiamethoxam (all neonicotinoids). Additionally, if you are set up to spray in-furrow, acephate at 0.75-1 lb/acre is a very good option in addition to an imidacloprid seed treatment but not in place of. We confirmed a few years ago that certain varieties seem to exhibit some host plant resistance to thrips. Finally, you have foliar rescue treatments as an option. 1 Both species have fairly wide host ranges, feeding on both broadleaf and grass plants, including alfalfa, common bean, grains, grasses, and various weed … So, when you are searching for thrips it can be easy to mistake some dirt of a piece of plant that is stuck to the bottom of the cotton leaves for a thrips. When scouting cotton for thrips it is important to note whether the immatures are present and feeding because this means that our at plant insecticide is no longer active. Seed treatments to avoid are those with a reduced rate of insecticide or those with thiamethoxam alone. either alone or in combination with a nematicide. This is because brand names change and the active ingredients associated with these brands change over time. The boll weevil arrived in the state that year and acreage dropped until the weevil was eradicated in the late 70s and early 80s. or imidacloprid (Gaucho, Aeris, etc.) Plant bugs (Lygus spp.) Want to see which lists are available? As a result, we have switched over almost exclusively to imidacloprid-based products. Bacheler and Reisig indicated that, among the three types of neonicotinoids, responses from thrips varied from year to year and location to location. Seed treatment. There are really only two seed treatment options in cotton: neonics and acephate. It shows selectivity in the other beneficial organisms in crops such as cotton, tomato, Burberry, apple, and many others. The presence of immatures is the key. Cotton has been important to North Carolina for many years, both in agricultural production and in the textile industry. Thrips are considered the No. N.C. You also … Because of this, we strongly recommend using them as partners for seed treatments and encourage growers to use a seed treatment on all their cotton to ensure uniform thrips protection. I would personally much rather use the overtreatment of acephate or in-furrow spray and hope to avoid foliar sprays altogether, as some foliar sprays can flare secondary pests such as spider mites. 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”. When thresholds are met or exceeded, options for foliar sprays of insecticides include, but are not limited to, the organophosphates acephate, dicrotophos, dimethoate, and the spinosyn 11 spinetoram as the most efficacious materials available for post-planting control of … It is important to remember that with both thiamethoxam and imidacloprid seed treatments, this only applies to tobacco thrips, making it a cotton problem that does not transfer over to corn or soybeans. All Rights Reserved. A foliar treatment may also be needed in some cases. Thrips are really little tan colored insects that have the shape of a grain of rice but they are way smaller. March 21, 2020 Cooperative Extension prohibits discrimination and harassment on the basis of race, color, national origin, age, sex (including pregnancy), disability, religion, sexual orientation, gender identity, and veteran status. Working hand-in-hand with our partners at N.C. A&T and 101 local governments, we conduct groundbreaking research that addresses real-world issues in communities across the state. The western flower thrips (WFT), Frankiliniella occidentalis is a recent exotic invader also found in cotton regions. This does not include value added through the North Carolina’s textile industry. Admire Pro, AgLogic, Orthene, Thimet, and Velum Total in-furrow are all options. Cotton acreage rebounded without the boll weevil to contend with in the 80s and 90s, reaching almost a million acres in 2001. NC State Extension is the largest outreach program at NC State University. Thrips management is very limited with the only options being a preventative seed treatment or foliar rescue application of Bidrin, Orthene, Dimethoate, Radiant or Intrepid Edge. The same thing that connects it to every corner of North Carolina: NC State Extension. 6). either alone or in combination with a nematicide. This option is being utilized again this year. Some of the more popular choices for thrips control in Kansas are the seed treatment thiamethoxam, planting-time applications of acephate and phorate, or foliar treatments of a low rate of dimethoate or acephate. UT recommends the following insecticides: Acephate or Orthene (90 or 97%) at 0.20 – 0.25 lbs product per acre. Thrips infestations in cotton vary by location, planting date, and year. BACKGROUND. North Carolina planted about 450,000 acres in 2013, which places the state third in cotton acreage behind Texas and Georgia. Higher rates usually do not improve control. North Carolina citizens each year through local centers in the state's 100 counties Importantly, they can also completely flop without an insecticidal seed treatment in some cases (with the exception of AgLogic which, depending on rate, usually looks as good or sometimes better than a seed treatment). Your rating: However, this phenomenon is not extremely widespread. Dyna-Gro’s Neem Oil. You will automatically get notified when we post news and tag it, Extension Weed Specialist & Assistant Professor, Professor of Crop Science & Extension Cotton Specialist, N.C. Cotton acreage reached its height in 1926, when North Carolina producers planted right at 2 million acres. The best defense against thrips is a rapidly growing cotton … Lots of folks are wondering what to use downstream for thrips in cotton. Thrips are some of the most damaging insect pests to the leaves of onions world-wide. To date, this has still not fully materialized. (6 days post insecticide application), whole seedlings were collected and submerged in soapy water in a glass Mason jar and vigorously shaken to dislodge thrips. It is similar in appearance to F. schultzei but paler, making it easy to distinguish from F. schultzei but hard to distinguish from T. tabaci.WFT causes similar damage to cotton seedlings and also eats mite eggs. Active ingredients available for thrips are acephate (not a neonicotinoid), clothianidian, imidacloprid, or thiamethoxam (all neonicotinoids). On 6-13-17 (4 days post insecticide treatment), untreated terminals with 2018 Beltwide Cotton … Also, there are many “look-a-like” thrips symptoms commonly seen in cotton from sandblasting and the use of residual herbicides. Although there are many species of thrips, the western flower and onion thrips are the most common species in North America. In 2011, we began observing reduced tobacco thrips control with the active ingredient thiamethoxam. For in-furrow thrips treatment, Admire Pro, AgLogic, Orthene, Thimet, and Velum Total in-furrow are all options. Adults are winged and capable of drifting long distances in the wind. or imidacloprid (Gaucho, Aeris, etc.) Please refer to the most recent Cotton Insect Management Guide for material rates and control options. Rarely is it ever economical to treat thrips past the fourth-leaf stage. Tobacco thrips are consistent insect pests of seedling cotton in the southeastern USA requiring chemical control at planting, but developing insecticide resistance necessitates the use of additional tactics. are two of the most economically important insect pest groups impacting cotton production in the USA today, but are not controlled by current transgenic cotton varieties.Thus, seed or foliar‐applied chemical insecticides are typically required to protect cotton from these pest groups. Some of these may be packaged with nematicides, such as abamectin and thiodicarb, that have some activity on thrips. Acephate (Orthene) seed treatment has provided moderate control in our environment and should be avoided as a standalone seed treatment. This does not necessarily mean that a foliar insecticide is warranted. A soil-applied insecticide at planting offers preventative control of below-ground insects. (Optional) In 2017, many growers experimented with the additional overtreatment of acephate or in-furrow sprays on top of imidacloprid treated seed and reported excellent results across the state. Tobacco thrips have recently developed resistance to some neonicotinoid insecticides such as thiamethoxam (i.e., Cruiser). Commonly used neonics include thiamethoxam (Cruiser, Avicta, etc.) Poor seedling growth will almost always delay maturity and make plant bug management much more difficult. Send Explanation. Many have wondered how long this product will hold up given that it is in the same class of chemistry as thiamethoxam. Cotton seed comes with a variety of seed treatment options that may either be purchased through a seed company or applied by a dealer downstream. What made it so helpful? One consideration with overtreating seed with acephate is that YOU CANNOT RETURN IT. We have been looking at this option for a number of years, and it has looked good. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. All these products in furrow without an insecticidal seed treatment can provide equivalent control to a seed treatment in some cases. It is very important to remember that there will always be adult thrips on cotton. Commonly used neonics include thiamethoxam (Cruiser, Avicta, etc.) In 2015, we began to see a decline in efficacy with imidacloprid in select trials. Cotton seed comes with a variety of seed treatment options that may either be purchased through a seed company or … Stem smearing with imidacloprid 17.8 SL @ 1ml:20 ml water and brush the liquid on the growing tip of the plant. Since that time, resistance in tobacco thrips to thiamethoxam has been confirmed through laboratory bioassays. Once you have this information, you will be able to make a decision. Previous to known thrips resistance, tests from Drs. With the loss of Temik for the 2012 growing season, insecticide seed treatments (ISTs) and over-sprays will be critically important for controlling thrips on seedling cotton. Cooperative Extension has offices in every county, NCDA&CS Agronomic Services – Soil Testing, NCDA&CS Agronomic Services – Plant Tissue Analysis, North Carolina Cotton Insect Scouting Guide, 2014 Cotton Belt Regional Insecticide Efficacy Summary, 2018 Cotton Belt Regional Survey Insecticide Efficacy- Cotton, Corn, Soy, North Carolina Cotton Producers Association, Southern Southeastern Cotton Growers and Ginners, Cotton Cultivated: Cotton Ag Data, Resources & Trends, Guidelines for Use of a Wick Applicator for Applying Mepiquat Chloride, Calibration of a Wick Delivery System for Mepiquat Chloride, Mountain Horticultural Crops Research & Extension Center, Vernon G. James Research & Extension Center, Entomology – Insect Biology and Management, Mountain Horticultural Crops Research and Extension Center, Weed Management in Nurseries, Landscapes & Christmas Trees. In 2011, we began observing reduced tobacco thrips control with the active ingredient thiamethoxam. Incidence of these secondary pests often requires further sprays, which can be expensive. When immatures are showing up, this means that seed treatments are beginning to break down and reproduction is taking place. An important thing to remember is that the first few weeks after plant emergence are critical to set the crop up for the rest of the year. With the loss of Temik for the 2012 growing season, insecticide seed treatments (ISTs) and over-sprays will be critically important for controlling thrips on seedling cotton. Since then, the use has increased substantially. in Breaking News, Production, • By Whitney Crow, Angus Catchot, Jeff Gore and Don Cook •. The finding of 2-3 thrips per plant is our treatment threshold. Subscribe By Email chevron_right. 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