The efficacy of two bio-rational pesticides on insect pests complex of two varieties of white cabbage ( Brassica olerace
- PDF / 536,550 Bytes
- 10 Pages / 547.087 x 737.008 pts Page_size
- 41 Downloads / 135 Views
ORIGINAL ARTICLE
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 N. T. Ngosong & E. D. Boamah & K. O. Fening & D. A. Kotey & K. Afreh-Nuamah Received: 18 March 2020 / Accepted: 15 October 2020 # Springer Nature B.V. 2020
Abstract Insect population count and yield were used to determine the effectiveness of two bio-rational pesticides -a commercial formulation of Pieris rapae granulosis 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 experiment was laid in a split-plot design with three replications, with the cabbage varieties as main plots and the bio-rational pesticides as subplots. Cabbage plots treated with Bypel 1® and ANKE had the lowest population of Plutella xylostella, Brevicoryne brassicae, Hellula undalis, Bemisia tabaci and Thrips tabaci for both seasons. The control plot consistently had higher pest population in both seasons. There was no detrimental effect of bio-rational pesticides on natural enemies. The biorational 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. Keywords Bio-rational pesticides . Bypel 1® . Aqueous neem kernel extract . Cabbage . P. Xylostella
Introduction N. T. Ngosong (*) : K. O. Fening : K. Afreh-Nuamah African Regional Postgraduate Programme in Insect Science (ARPPIS), College of Basic and Applied Sciences, School of Agriculture, University of Ghana, P. O. Box LG. 68,, Accra, Ghana e-mail: [email protected] E. D. Boamah : D. A. Kotey Council for Scientific and Industrial Research-Plant Genetic Resources Research Institute, Box 7, Bunso, Ghana K. O. Fening Soil and Irrigation Research Centre, Kpong, College of Basic and Applied Sciences, School of Agriculture, University of Ghana, P. O. Box LG. 68, Accra, Ghana
Brassica vegetables such as cabbage (Brassicae oleracea var. capitata l.) which is often grown in Ghana and many other countries, are susceptible to damage by many insect pests which include: diamondback moth, Plutella xylostella (L) (Lepidoptera: Plutellidae), the cabbage webworm, Hellula undalis (F) (Lepidoptera: Crambidae), the cabbage aphid, Brevicoryne brassicae (L) (Hemiptera: Aph
Data Loading...
