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|Title: ||Effects of Neem (Azadirachta indica A. Juss) Products on Aphis craccivora and its Predator Harmonia axyridis on Cowpea|
|Authors: ||Baidoo, P. K.|
Baidoo - Ansah, D.
|Keywords: ||Aphis craccivora|
|Issue Date: ||2012|
|Publisher: ||American Journal of Experimental Agriculture|
|Citation: ||American Journal of Experimental Agriculture 2(2): 198-206, 2012|
|Abstract: ||Aims: To assess the effectiveness of two neem formulations in the control of cowpea
aphid, Aphis craccivora and how these affect its predator Harmonia axyridis.
Study Design: The experiment was conducted in a Randomized Complete Block Design in
which cowpea was planted on raised beds.
Place and Duration of Study: The experiment was conducted on an experimental farm of
the Department of Theoretical and Applied Biology, Kwame Nkrumah University of Science
and Technology, Kumasi, Ghana during the minor rainy season of 2009.
Methodology: Two neem-based products were prepared from dried neem seeds: aqueous
neem kernel extract (ANKE) and neem kernel powder (NKP). A standard chemical
insecticide, lambda cyahalothrin was used as a reference insecticide and a control. There
were four treatments and four replications. The neem formulations and chemical insecticide
were sprayed onto cowpea plants to control A. craccivora. Data were collected on numbers
of A. craccivora, H. axyridis and number of damaged leaves as well as the yield of cowpea.
Results: Significantly more A. craccivora were collected on the control plots than on the
treated plots (P= 0.020). The numbers of A. craccivora on ANKE and NKP-treated plots did
not differ significantly (P=0.320). Harmonia axyridis numbers on the various treatments did
not differ significantly (P=0.301). Significantly more leaves were damaged on the control
plots than the treated plots (P=0.012) but damaged leaves on the 2 neem-treated plots did
not differ significantly.
Conclusion: The two neem products were effective in reducing the population of A.
craccivora. Thus application of neem products can be used as an alternative to chemical
insecticide to control A. craccivora.|
|Description: ||An article published by American Journal of Experimental Agriculture
2(2): 198-206, 2012|
|Appears in Collections:||College of Science|
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