1. Why Black thrips is difficult to control? 2. Why we use LC50, Why not LC90?

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Lin Tian

Due to high chemical resistance, Strong concealment, and strong activity ability, thrips are difficult to control. if you mentioned black thrips live in cowpea and other beans, it should be Megalurothrips usitatus.

I don't know your purpose regarding LC50. It is valuable if you need a live insect after treatment.

Jainesh Ram

I believe that exposure to LC₉₀ levels may contribute to the development of resistance in target insect populations against the applied pesticides.