International Journal of Horticulture, 2018, Vol.8, No.1, 1-7
6
The results obtained from this study showed that the three plant powders significantly reduced oviposition and
adult emergence of
C. maculatus
on cowpea treated seeds. The effect of the powders on oviposition could be due
to respiratory impairment which probably affects the process of metabolism and consequently other systems of
the body of the insects (Adedire
et al
., 2011; Ileke
et al
.
,
2014). The beetles were unable to move freely within
the treated cowpea seeds due to the presence of the powders and this might have affected mating activities and
sexual communication (Ojo and Ogunleye, 2013). The resultant reduced adult emergence could be to the fact the
C. macualtus
lay eggs on the seed coat thus bringing the eggs and larvae in close contact with the plant powders
as reported by Adedire and Lajide (2001). It is evident in this research work that root bark powder of
S
.
longepedunculata
is effective in controlling the population of
C. maculatus
. The powder could be mixed with
stored cowpea seeds in order to protect them against
C. maculatus.
The root bark powder could therefore serve as
alternatives to synthetic insecticides for use by resource-poor farmers who store small quantities of the seeds for
their consumption, sales and planting since the powder is readily available.
Acknowledgements
The authors would like to thank the technologists at the Department of Crop Science and Horticulture, Federal University, Oye Ekiti,
Ekiti State, Nigeria for their assistance during the preparation of plant powders.
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