Control
Chilli thrips are known to develop resistance to pesticides extremely quickly. This is thought to be a consequence of the short timespan and large capacity of their reproductive cycle, drawing comparisons to spider mites. In addition, they have an extremely wide host range, providing population reservoirs even after the most thorough pesticide application.
Of the reduced risk insecticides, only the spinosyn insecticides and abamectin are known to be effective against this pest. Neem based products are considered effective synergists. Product rotation is integral to resistance prevention programs. Insecticidal soaps and horticultural oils are both effective, but only in very frequent, sometimes impractical spray schedules (at least once a week). Systemic neonicotinoids such as imidacloprid were once considered to be sparing of beneficial insects and natural predators, and recommended for integrated pest management of chilli thrips, especially when used as a soil soak or drip irrigation product. The past decade has revealed that neonicotinoids can seriously impact beneficial insects, especially bees, through effects that are not immediately apparent - even at trace concentrations.
Entomopathogenic fungi are an emerging control method being used against a variety of insects, including chilli thrips. Beauveria bassiana and Metarhizium spp. have both attracted research for this use. Multiple such products are available for use in Asian countries. Only one Beauveria bassiana product is registered as as an insecticide in the United States. Tests of these products show that they are mediocre control agents, but may be useful in rotation with other insecticides or in combination with spray oils. Unfortunately, these agents are broad spectrum insecticides, and do not spare natural predators or desirable insects such as bees and butterflies.
Read more about this topic: Scirtothrips Dorsalis
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