programme, additional pesticides may also be used. 9) The correct response is (c). Instead than just treating existing insect issues, an IPM programme aims to
One explanation why some pesticides can lose their effectiveness if used repeatedly in the same area is suggested by the discovery that populations of pesticide-degrading microorganisms are substantially higher in soils with a relatively lengthy history of pesticide use than in soils that are free of such chemicals. There are many ways to define a weed. Typical classifications include: an unattractive plant The discovery that there are many suggests one reason why certain pesticides can lose their effectiveness if administered repeatedly in the same location
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