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INSECTICIDAL POTENCY OF ASYSTASIA VOGELIANA ON BEAN SEEDS (VIGNA UNGUICULATA) IN STORAGE. By: IBOH, C. I., OKON, O. E., AJANG, R. O., OKOI, A. I., ARONG, G. & EFFIOM, O. E.

ABSTRACT

Investigation on the effect of Asystasia vogeliana powder on bean weevil (Callosobruchus  maculatus)  was  carried  out  in  CRUTECH,  Calabar,  with  a  view  to  protecting Vigna unguiculata  and having an alternative means to chemical  application on beans  (Vigna  unguiculata)  in  storage.  The powder of Asystasua vogeliana (Yoseh) was applied at different dosages of 1mg, 3mg and 5mg on stored bean grains (Vigna unguiculata) and tested against the bean weevil, Callosobruchus maculatus, in the laboratory. Adult mortality at 24, 48, 76 and 96 hours were assessed. Adult .emergency and grain damage result showed that 3 and 5 mg powder of the plant leaves were more toxic to C. maculatus and suppressed F1 progeny emergence compared to 1mg powder.  The  efficacy  of  the  powder  on  the  weevil  was  dose  dependent  with  higher  doses  providing greater  protection to  bean grains.  The highest mortality rate of C. maculatus was observed at a concentration of 5mg of A. vogeliana powder after 3 days. The phytochemical screening of the plant revealed the presence of Alkaloids, Flavonoids, Tannins, Glycosides, Saponins, Polyphenol, Steroids, Anthraquinones and reducing compounds. This research work provides the scientific basis for the use of A. vogeliana powder in stored product  protection  at  the  small-scale  farmer  level  to  reduce  the  application  of  toxic synthetic insecticides. 

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