South Asian Journal of Experimental Biology, Vol 1, No 3 (2011)

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Jul 12
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Efficacy of Senna occidentalis leaves powder on oviposition, hatchability of eggs and emergence of Callosobruchus maculatus (Fab)on treated cowpea seeds

J. M. Adesina, L. A. Afolabi, A. T. Aderibigbe

Abstract


The efficacy of Senna occidentalis leaf powder against Callosobruchus
maculatus (F) on cowpea treated seeds was evaluated under ambient
condition (32±0.64°C and 68±3% R.H.) at the laboratory of Agricultural
Technology of Rufus Giwa Polytechnic, Owo. C. maculatus was obtained
from Oja‐Oba market, Owo, Ondo State of Nigeria. The insects were reared
and bred in the laboratory. The cowpea seeds used for the bioassay were
kept in the freezer for 15 days to eliminate infestation from the field. The
leaf powder was obtained after milling and four dosages of the powder (0.5,
1.0, 1.5 and 2.0g) were separately admixed with 20g of cowpea in separate
petri dishes. Ten pairs of C. maculatus were introduced into each petri‐dish.
Number of adult mortality, egg laid, percentage egg hatching, adult
emergence and weight loss from each treatment were compared with
control treatment. It is concluded that the Senna occidentalis contains toxic
properties valuable for the control of C. maculatus.

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