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The effects of different dosages of the insecticide mixtures endosulfan alphamethrin on adults of the biological control agent cyrtobagous salviniae coleoptera curculionidae against salvinia molesta



The effects of different dosages of the insecticide mixtures endosulfan alphamethrin on adults of the biological control agent cyrtobagous salviniae coleoptera curculionidae against salvinia molesta



Madoqua 17(1): 37-40



The effects of the insecticide used for the control of Glossina morsitans (tsetse fly) on the weevil Cyrtobagous salviniae Calder and Sands were investigated. The latter is currently used as a biological control agent against the aquatic weed Salvinia molesta Mitchell. The survival of C. salviniae was measured after the application of an insecticide mixture of endosulfan and alphamethrin at different dosages. The results show that the adult weevil is susceptible to the chemicals, even at low dosages (6 g.ha endosulfan). The results also indicate that the immature stages are minimally affected dosages of 6 and 12 g/ha, but are killed at 18 g.ha dosage. The weevil populations treated with 6 and 12 g/ha dosages recovered remarkedly after three weeks, but those treated with a 18 g/ha dosages failed to fully recover during the time span of the experiment. In order to give the weeevil the best chance of survival it is recommended that sprays against tsetse flies only be applied when the water temperatures are above 21.degree. C and that the intervals of repeated applications be 21 days or more.

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