EVALUATION OF THE TOXICITY OF DIFFERENT NICOTINESULFATE CONCENTRATIONS IN CONTROLLING NYMPHALINSTARS AND ADULTS OF CABBAGE APHID BREVICORYNEBRASSICAE (L.) ( HOMOPTERA: APHIDIDAE )

Abstract

The aim of this project is to study the efficacy of nicotine (as nicotine sulfate)
extracted from tobacco by- products of the Iraqi Tobacco and Cigarettes Industry
against cabbage aphid Brevicoryne brassicae (L.). On the basis of LC50 values,
laboratory data have indicated a positive correlation between these values and
progress of insect life cycle . The LC50 values for the fourth nymphal instar were 4.9
more than first instar; while it was for apterae 6.5 times more than the first instar for
nicotine sulfate. The alatae were more susceptible to insecticide than apterae, where
LC50 values for apterae were 1.03 times more than that for alatae LC90 for nicotine
sulfate on all stages follow the same trend as for LC50 but with higher values.
Finally, we recommend the use of nicotine sulfate as an insecticide for the control of
cabbage aphid instead of the widely used pesticides compounds which are
environmental pollutants