Voorbeelden van insecticide

• For the rotation plots, sets of cards for all four insecticides used in the rotation schedule were prepared each week for the bioassays.

• Each of the seasonal factors increased the impact of the insecticide because they lowered the population's growth potential.

• Insecticide treatments (pyrethroids and neonicotinoids) applied before collection of the spring sample may be responsible for such selection.

• To enable measuring the effect of reduced borer densities on maize yield, the maize monocrop and all intercrops were grown with and without insecticide treatment.

• No insecticides were applied to the permanent data trees and two guard rows on either side throughout the study.

• The use of insecticides has been the major control strategy for cowpea and okra pests, especially in the tropics.

• Three chapters are devoted to insecticides, for mulations and application methods, and problems associated with their use, particularly the development by pests of insecticide resistance.

• For this reason, reliance on insecticides as the sole means of managing infestations was considered at best a short term solution.