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Adults generally begin to appear on direct seeded fields and transplants in early September. Trials conducted on untreated broccoli plots at YAC have shown that mid-September has historically been the time that bagrada begin to show up in large numbers; peak abundance of bagrada bug has occurred from late September to early October (see graphs below). However, there has been a trend of lower bagrada bug abundance since 2012, and last fall was the lightest we’ve recorded bagrada populations since we started tracking them in 2010. Reports of bagrada in commercial cole crops are beginning to trickle in from PCAs, albeit very few and light numbers. Similarly reports out of Imperial Valley and Coachella suggest that populations are light there as well. We have been finding adults and damage on direct seeded broccoli for a week or so at the Yuma Ag Center, but numbers have not exceeded the action threshold yet (>5% of plants with fresh feeding signs). So, what should a PCA expect for this season? Can’t say for sure, but here are a few management tips to consider. (1) When monitoring for bagrada bugs PCAs should focus on fresh feeding signs on new plant tissue, and adults later in the day when they are most active. (2) Direct-seeded and transplanted crops are susceptible to bagrada bug infestations during stand establishment and up to the 6-leaf stage. (3) We recommend that control should be initiated immediately if you can readily find 5% or more of plants with feeding signs. This can include chemigation or aerial applications with pyrethroids. Contact insecticides such as pyrethroids, Lannate, and Lorsban should be used once stands are lined out and pipe is pulled. After stands are established and plant size increases up to the 2 leaf stage, or on tagged transplants, consider alternating to dinotefuron (Venom/Scorpion) for protecting plants from bagrada feeding. This neonicotinoid will also provide knockdown of adult whiteflies and nymphs. (4) Also, growers who planted Nipsit (clothianidin), should begin to closely monitor for fresh feeding damage around 14 days after emergence. More information on bagrada bug management on fall cole crops can be found in: Bagrada Bug Management Tips for the Low Desert-2017. | |||
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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