Over the past 20 years, there has been an unprecedented development of insecticide chemistry that has had a major impact on how PCAs manage insects on leafy vegetables and melons. Among these were several breakthrough chemistries including the neonicotinoids, spinosyns, ketoenols and diamides. Without question these products (along with other recently registered compounds) are more effective and safer to use than compounds used prior to 1993. It appears that the AgriChemical Industry is beginning a new cycle of insecticide discovery and development where several new products are nearing registration. In 2014, it is anticipated that several new insecticide products will be available for management of the key pest found on desert crops. Closer (Sulfoxaflor) is currently registered for use in leafy vegetables and melons in Arizona and should have an excellent fit for aphid management in leafy vegetables. Although it has a similar target site as the neonicotinoid chemistry, it is not considered a neonicotinoid by IRAC because of differences in how insects metabolize the toxin. Rather, it is classified as a sulfoximine and the first of the chemical class to be registered. Exirel/Verimark (Cyazypyr) are anticipated to be registered in Arizona/California in early 2014. Cyazypyr is not a new chemistry, but rather a 2nd generation Anthanilic diamide. What sets Cyazypyr apart from the other diamides is its unique cross-spectrum activity against major chewing and sucking pests via soil systemic or foliar applications. Two other compounds, Sivanto (flupyradifurone) and Torac (tolfenpyrad) are anticipated to be available in late 2014-early 2015. Sivanto, like Closer, is not a neonicotinoid, but rather is considered a Butenolide. It has good activity against whiteflies as both a foliar spray and as a soil-applied systemic treatment. As a soil systemic in fall melons, it has shown to be very effective against adult whitefly and CYSDV suppression similar to Venom. Finally, Torac is a pyrazole; a mitochondrial complex I electron transport inhibitor. In essence, it is a metabolic toxin that inhibits energy metabolism when the insect comes in contact with the compound. It has shown good thrips activity when used in combination with Radiant or Lannate, and may be an alternative to pyrethroids in tank mixtures. More detailed information on these compounds can be found in the following publications: New Insecticides for Desert Produce and Melons.
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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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