Thrips are sneaky; they like to hide. Biocontrol programs against thrips start early in thecrop cycle. Sprenches of nematodes, releases of predatory mites on the foliage and substrate, and when required, a few applications of a biopesticide like BotaniGard (BioWorks) should do the trick, right?Not if you are carrying thrips into your greenhouse, without knowing it, every week.Despite propagators' best efforts, small numbers of pests may be hiding on cuttings, especially pests with widespread resistance to most conventional insecticides, such as western flower thrips (resistant to 30 active ingredients) and two-spotted spidermites (resistant to 95 active ingredients).
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