Grower Questions and Answers

  1. “One more question, what do you know about Grandevo, PFR97 and Entrust it terms of their affect on predatory mites? I’m thinking of only using stratiolaepsis, Andersoni, Californicus, Fallacis and Rove Beetles during flowering.  And using the 3 bio-insecticides and Botanigard during veg.  Any thoughts or suggestions?”
Grandevo contains Chromobacterium, a stomach toxin to leaf feeding pests. Grandevo functions primarily as a stomach poison, so it must be ingested by insects and mites to be effective. It does not have systemic activity; therefore, it must be on the feeding surfaces to be effective. Like other stomach poisons, excellent plant coverage is necessary, so use plenty of water and pressure to get complete coverage. Grandevo is more effective on newly hatched larvae and nymph stages of insects and arthropods, so regular scouting and early applications are necessary for good control.
Marrone assures us that it is safe on beneficial insects because they don’t consume the active ingredient.Here is the label statement
In a federally approved study, GRANDEVO was found to be practically non-toxic to honeybees. This product has been evaluated for toxicity to non-target insects in a variety of bioassays and on a variety of crops under various normal growing conditions. However, testing all beneficial insects, in all situations, mixtures and combinations, is not feasible. Prior to treating entire crop where the release of beneficial insects serve as part of an Integrated Pest Management (IPM) program, consult with an extension specialist, a pest control advisor (PCA) or with the product manufacturer.
No observed adverse applying on beneficial arthropods that act as natural enemies of whiteflies such as Macrolophus, Encarsia formosa, Orius laevigatus, Eretmocerus mundus, Phytoseiulus persimilis and Amblyseius swiskii effects, evaluated in laboratory tests and semi-field.
*the statement is from No Fly, which is the same active ingredient as PFR 97.
I would say, in general Spinosad has an impact on predatory mites. The soil dwellers such as rove bettle and stratiolaelaps will likely survive applications.
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