Laboratory experiments on the side effects of selected herbicides and insecticides on the larvae of three sympatric Poecilus‐species (Col., Carabidae)
1989
Kegel, B.
The side effects of the insecticides EKAMET, DURSBAN and HOSTAQUICK and the herbicides FUSILADE, SIMAZIN, ATRAZIN, ROUNDUP, MCPA and TRIBUNIL on the larvae of 3 Poecilus‐species were investigated by the means of laboratory rearing. The 3 insecticides killed all L1‐larvae of Poecilus versicolor, P. cupreus and P. lepidus within 16 days. The L2‐ and L3‐larvae of P. versicolor were not affected by EKAMET after 28 days. In the case of HOSTAQUICK the number of surviving larvae increased with the age and size of the tested larval instars. All larvae which came in contact with the insecticides showed signs of severe poisoning already after two days. The mortality due to the investigated herbicides was much less than 50% in all cases. Significant reductions of the numbers of hatched adults were observed only for the herbicide MCPA and the species P. versicolor. P. lepidus, which did not reach pupation under the experimental conditions (15 °C), was affected by FUSILADE and ATRAZIN. The time needed for development until the hatching of the adults was found to be significantly longer than normal, when L2‐larvae of P. versicolor were tested with the insecticides EKAMET and HOSTAQUICK. No differences were recorded in the experiments with herbicides. Because of the higher susceptibility of the larval stages of carabid beetles, the described method is useful and discussed as a possible completion to the work of the IOBC/WPRS‐Group “Pesticides and Beneficial Organisms”.
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