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|Title: ||Influence of different nutrient applications on insect populations and damage to cabbage|
|Authors: ||Mochiah, M. B.|
Baidoo, P. K.
|Issue Date: ||2011|
|Publisher: ||Journal of Applied Biosciences|
|Citation: ||Journal of Applied Biosciences 38: 2564 - 2572|
|Abstract: ||Objective: Amendments aiming to improve soil fertility have been found to increase pest populations on
plants. This study was conducted to evaluate the effects of organic (poultry manure) and synthetic (NPK)
fertilizers on insect populations associated with cabbage.
Methodology and results: Two field experiments were conducted at the Theoretical and Applied Biology
Department Garden of Kwame Nkrumah University of Science and Technology and CSIR-Crops Research
Institute, Kumasi, Ghana from October 2008 to January 2009 and May to August 2009, respectively. Three
main treatments, i.e. NPK 15:15:15 fertilizer at 10g/cabbage plant; poultry manure at 50g/cabbage plant
and control (no nutrients) were applied. The experimental set up was a Randomized Complete Block
design (RCBD) with three replications. Parameters studied included insect pests’ numbers and their natural
enemies. The percentage leaf damage, fruit damage, plant with multiple head damage and yield were
determined. Major insect pest recorded included Brevicoryne brassicae, Plutella xylostella, Hellula undalis
and Pieris rapae which caused damage to the cabbage plant (Brassica oleracae var. oxyllus). The natural
enemies of pests of cabbage identified were the ladybird beetle, (Cheilomenes sp), huntsman spider,
Heteropoda venotoria and black carpenter ant Camponotus pennsylvanicus. The control plots recorded
cabbage plants with the highest yield in terms of head weight. Both poultry manure and inorganic fertilizers
(NPK) generally increased insect pest attack on cabbage plants compared to the control.
Conclusions and main findings: It is concluded that when soil amendments such as poultry manure and
inorganic fertilizers are applied to restore or increase fertility, pest control measures such as the use of
chemical insecticides and other pest management options should be put in place to mitigate the effects of
infestation of insect pests on crop productivity.|
|Description: ||An article published by Journal of Applied Biosciences, 2011; 38: 2564 - 2572|
|Appears in Collections:||College of Science|
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