Integrated control in colza crops.
The prospects for the integrated control of insect pests of rape (colza) are discussed in relation to the results of investigations in southern France in 1969-1973 and central France in 1974-78. Observations on various pests using traps and studies on the biology and injuriousness of Ceutorhynchus assimilis (Payk.) (and conserving its parasite Trichomalus bracteatus (Wlk.) (herbidus (Wlk.))) led to improved usage of chemical control measures so that C. assimilis (and consequently also Dasineura brassicae (Winn.)) became progressively less important until control measures against them were unnecessary. However, many of the results obtained with other pests were not usable, and the introduction of integrated control against pests of rape is complicated by the fact that there is a succession of 5 or 6 different pests attacking the crop, which develops over 3 seasons.