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Vegetable IPM Updates Archive
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Clothianidin Seed Treatment for Bagrada Control (July 22, 2015)
Since the bagrada bug became established in the desert in 2010, growers and PCAs quickly found that preventing excessive feeding damage on newly-established crops is critical to economic broccoli production. Local surveys have estimated that the invasive stink bug annually infests more than 80% of the acreage in Arizona and southern California, resulting on average in more than 10% stand losses and plant injury to direct-seeded broccoli crops. The potential for the pest to cause significant crop losses coupled with the lack of biological control alternatives has left little alternative but to control outbreak populations with foliar applied insecticides. Furthermore, because bagrada bug can quickly cause significant feeding damage to seedling plants, effective insecticide treatments applied in the field need to be quick acting. Currently, vegetable growers in Arizona and California rely heavily on frequent applications of pyrethroid insecticides to control adult infestations on seedling cole crops. Given the magnitude of pyrethroid usage historically applied to desert vegetable crops, alternative insecticides will be needed to protect desert cole crops from bagrada bugs and conserve the pyrethroid chemistry. Among the newer classes of chemistry, foliar-applied neonicotinoids such as Venom/Scorpion have been shown to effectively control bagrada bug adults, but at-planting, soil systemic applications of neonicotinoids such as Admire Pro, Belay and Venom do not prevent bagrada bug from damaging seedling broccoli plants. However, in other parts of the world neonicotinoid seed treatments have been shown to provide protection against bagrada bug. For example, in India, field trials showed that planting mustard seeds treated with imidacloprid resulted in significantly lower plant damage due to bagrada bug. Recently, Valent U.S.A. registered clothianidin as a seed treatment on broccoli under the name of Nipsit®. Based on our research, this technology provides another tool for broccoli growers to use in their annual battle against bagrada bugs in the desert. The results of field trials conducted at the Yuma Ag Center from 2012-2014 that evaluated the effectiveness of Nipsit (clothianidin) seed treatments for preventing bagrada bug feeding damage and yield loss in broccoli can be found in Evaluation of Clothianidin Seed Treatments for Bagrada Bug Control in Broccoli.


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