Evaluation of the Impact of Mesostena picca (Kraatz), a Predator of the Bruchid,Caryedon serratus (Olivier) on Stored Groundnut and Tamarind
2014
The impact of Mesostena picca (Kraatz), a predator of the bruchid,
Caryedon serratus (Olivier) on stored groundnut and tamarind was
evaluated in the Laboratory of the Department of Crop Protection,
Modibbo Adama University of Technology, Yola. Caryedon serratus
(Olivier) is one of the major insect pests of groundnut and
tamarind. Infestation results in characteristic round holes which
causes qualitative and quantitative losses. Considering the
limitations of conventional insecticides, there is a need for an
alternative method of control. In this study, a non-chemical means
of control for both consumption and sowing was sought.
Groundnut and tamarind seeds were treated with the bio- agent,
Mesotena picca Kraatz. The bruchid infestation was significantly
reduced in the treated seeds compared to the control. The least
number of eggs laid and the least mean percentage damaged seeds
was obtained in chemical treated seeds in both stored products
(67.00 and 64.33; 6.00 and 4.67) significantly followed by the
bio-agent treated seeds (93.33 and 92.00; 32.00 and 31.00) and
the highest was recorded in the untreated seeds (303.67 and
301.33; 90.00 and 85.33). The result also shows that, the highest
mean percentage mortality, least mean percentage adults emerged
and the least mean percentage weight loss in both stored products
were observed in chemical treated seeds (97.23 and 95.33; 0.67
and 0.70; 3.67 and 3.33) significantly followed by the bio-agent
treated seeds (86.27 and 86.17; 3.67 and 3.67) respectively. It was
observed that, in the presence of the bio- agent, the bruchids could
not freely feed on the stored products compared to the control.
This reduces the extent of damage on the stored products.
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