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Call to halt pyrethroid use against Brazil's earworms

Certain pesticides including pyrethroid insecticides should be used sparingly or avoided in control of corn earworms (Helicoverpa spp) on cotton and soybeans, Brazilian media report. They cite agronomist Ricardo Heinz who claims that the insecticides control natural predators of the earworms more than they do the pest. "Farmers should be aware that the use of certain heavy substances – based on pyrethroids – needs to be eliminated, as the applications not only affect earworms but also a complex range of insects," he says. Growers are receiving varied recommendations following several official state of emergency declarations against the pest (Agrow passim).

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