The efficacy of two bio-rational pesticides on insect pests complex of two varieties of white cabbage (Brassica oleracea var. capitata L.) in the coastal savanna region of Ghana
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Date
2021
Authors
Ngosong, N. T.
Boamah, E. D.
Fening, K. O.
Kotey, D.A.
Afreh-Nuamah, K.
Journal Title
Journal ISSN
Volume Title
Publisher
springer
Abstract
Abstract Insect population count and yield were used
to determine the effectiveness of two bio-rational pesti cides -a commercial formulation of Pieris rapae granu losis virus and Bacillus thuriengensis, Bypel 1® (PrGV
+ Bt) (1.5 g/l w/v) and aqueous neem kernel extract
(ANKE) (50 g/l w/v), on the insect pests complex of
two cabbage varieties, KK cross and Oxylus for two
consecutive cropping seasons of 2016/2017. The exper iment was laid in a split-plot design with three replica tions, with the cabbage varieties as main plots and the
bio-rational pesticides as subplots. Cabbage plots treat ed with Bypel 1® and ANKE had the lowest population
of Plutella xylostella, Brevicoryne brassicae, Hellula
undalis, Bemisia tabaci and Thrips tabaci for both sea sons. The control plot consistently had higher pest population in both seasons. There was no detrimental effect
of bio-rational pesticides on natural enemies. The bio rational pesticides-treated plots produced higher yield
than control plots. Mean numbers of P. xylostella was
higher on KK (0.61, 1.46) compared to Oxylus (0.65,
1.70) in both seasons, respectively. The yield between
the cabbage varieties was not significantly different in
both seasons, although Bypel 1® and ANKE treated
plots generally produced significantly higher yields than
the control plot. Yield between both cropping seasons
was significantly different (p = 0.039). These findings
provide evidence that bio-rational pesticides may offer
effective management of the pest complex of cabbage
and may be successfully used as an integral part of IPM
in Africa as a means to curb the abuse of synthetic
insecticides.
Description
Research Article
Keywords
Bio-rational pesticides, Bypel 1, Aqueous neem kernel extract, Cabbage, Xylostella