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Asian Journal of Crop Science
  Year: 2019 | Volume: 11 | Issue: 2 | Page No.: 71-76
DOI: 10.3923/ajcs.2019.71.76
 
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Efficacy of Bitter Apple (Solanum incanum) in Relation to Contact Time for Controlling Cabbage Aphids (Brevicoryne brassicae)

Culver Mvumi

Abstract:
Background and Objectives: Southern Africa needs plant pesticidal technologies to control aphids (Brevicoryne brassicae) as alternatives to synthetic chemicals. This study sought to determine the efficacy of Bitter Apple (BA) (Citrullus colosynthis) fruit solution to control cabbage aphids by considering aphid mortality in case of varied BA contact time. Materials and Methods: Treatments were prepared by pounding ripe BA fruits to form a paste, then mixed with distilled water to obtain BA fruit concentrations (30, 60 and 90 mL L1). The treatments were mixed with 3, 6 and 12 g of sugar, respectively. Negative and positive controls were no BA (distilled water only) and dimethoate 40% EC, respectively. Efficacy of each concentration of BA was evaluated at 6, 24 and 48 h after application. Results: Bitter apple was significantly (p<0.001) efficacious to cabbage aphid. All BA concentrations increased aphid mortality at all the contact times as the contact time increased. At a concentration of 90 mL L1, the highest mortality (13.00) was at 6 h and was significantly different from the negative control. The lowest concentration (30 mL L1) was significantly different from the negative control at 24 and 48 h. Conclusion: This study concluded that bitter apple fruit extract should be used at a concentration of 90 mL L1 at 48 h of contact time to obtain highly significant cabbage aphid mortality.
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How to cite this article:

Culver Mvumi , 2019. Efficacy of Bitter Apple (Solanum incanum) in Relation to Contact Time for Controlling Cabbage Aphids (Brevicoryne brassicae). Asian Journal of Crop Science, 11: 71-76.

DOI: 10.3923/ajcs.2019.71.76

URL: https://scialert.net/abstract/?doi=ajcs.2019.71.76

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