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Thrips damage to young onions is more devastating than on larger plants late in the growing season; however, thrips feeding opens up the onion to … How to control onion thrips in 2019 In recent seasons, periods of settled warm and dry weather in late spring and early summer have led to high insect pressure. Phots courtesy of Karen Delahaut (left) and Joe Ogrodnik, Cornell University (right). Onion thrips (Thrips tabaci) are an important annual pest of onion. Natural predators can help manage thrips populations, most effectively later in the season when thrips are more exposed. 2. An excellent natural adaptation capacity? Early in the season, thrips larvae are somewhat protected from … The efficacy of pesticides registered in Canada for thrips control is likely dependent on the species present in your greenhouse, and their source. Phots courtesy of Karen Delahaut (left) and Joe Ogrodnik, Cornell University (right). These conditions are particularly conducive for onion thrips since they get washed away and/or drown in leaf axils in wet weather. At least 25 plant families are infested. Heavy rains and overhead irrigation can wash thrips off of onion leaves. Onion thrips damage to onion leaves (left) and numerous onion thrips adults and nymphs on an onion leaf (right). This insect causes significant economic losses, by reducing yields up to 60%. Onion thrips are most common in areas with hot dry weather during the growing season and can be quite damaging to entire crops of onions. Distribution: It is cosmopolitan in distribution. It is necessary for the product to reach inside the plant base of the leaves where the majority of the thrips are located. Onion thrips is the most important insect pest of onions. Using high pressure and high water volume in the application enables this to occur. In addition, the eggs are laid into the leaf tissues where they may escape control. The most common and harmful species are the onion thrips Thrips tabaci and the western flower thrips Frankliniella occidentalis.These pests are less sensitive to pesticides and cause serious damage to vegetable crops as well as to ornamentals and soft fruit. The secret of thrips chemical control in onions is the placement of the pesticide. Sampling (plant taps) by OMAFRA and University of Guelph student Ashley Summerfield showed that the thrips population was a roughly split between Western flower thrips and onion thrips – a fairly new pest we’ve been seeing in Ontario greenhouses. References Andaloro, J. T. and A. M. Shelton. In United States of America and Canada this pest along with “onion maggot” is considered as serious pest of Onion. Thrips. The presence of high numbers of onion thrips (especially in specific varieties such as “white magnum” and “feelin’ green”) helps explain why the … Onion thrips (117) - Worldwide distribution. Onion thrips is difficult to control because the mobile stages of this insect are found mainly in the narrow spaces between the inner leaves where spray coverage is difficult to accomplish. They can attack many garden crops, but most commonly cause serious damage to onions, leeks and garlic. A similar pattern has been seen in Europe, with onion thrips now a major pest issue for Dutch growers.” With the loss of chlorpyrifos three years ago, and a widespread resistance to pyrethroids, Tracer (spinosad) and Movento (spirotetramat) are currently the only chemical options for growers: 1983. Photo credit: A. Summerfield (UofG). Thrips pictured here include western flower thrips (left), onion thrips (centre) and chrysanthemum thrips (right). Onion thrips damage to onion leaves (left) and numerous onion thrips adults and nymphs on an onion leaf (right). Appearance: Adult onion thrips are about 1 / 12 inch long, thin and pale yellow to brown in color. Genus – Thrips . On onions, a preferred host, but infestations also occur on onion relatives, beans, brassicas, carrot, cotton, cucurbits, legumes, papaya, pineapple, potato, tobacco, tomato and many ornamentals. Appearance: Adult onion … That’s why thrips have become one of the most feared and widespread pests. Species – tabaci . Research has shown that onion fields that are overhead irrigated have lower thrips populations than neighboring fields receiving furrow or drip irrigation. Thrips pierce cells and suck up the contents, leaving white specks. In India T. tabaci is widely distributed throughout the country and is considered as most important pest of onion …

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