Effects of Malathion Dust and Mexican Tea Powder (Chenopodium Chenopodium ambrosoides) Combinations on the Maize W Weevil, Sitophilus zeamais Mostch. (Coleoptera: Curculionidae) on Maize
Keywords:
Malathion 5% D, Mexican tea leaf powder, Maize weevil, Maize hybrid BH-540Abstract
The experiment was conducted in the laboratory at the Bako Agricultural Research Center, from January to July 2013. Combinations of different rates of Malathion and Mexican tea powder were evaluated against the maize weevil in no choice situations. The treatments were laid out in a randomized complete design with three replications. After three months of initial infestation the duration of their effectiveness of the treatments was evaluated by re-infesting with the same number of weevils as the previous. Analysis of variance indicated significant differences among the treatments in all of the parameters measured. The rate of mortality in all of the treatment combinations ranged from 19-100%, while that of the untreated check ranged from 0-3% following 90 days after infestation. Similarly, the number of progeny weevils emerged, percentages of grain damaged and seed weight losses in all of the treatment combinations were significantly lower than that of the untreated check after 90 days of infestation. In terms of adult mortality all of the combinations were as effective as standard check following 90 days after infestation. The combination treatments showed persistent effect and gave significant control over the untreated check for up to five months. However, from economic analysis (cost of treatments) point of view the least cost was observed in treatment six (T 6 ) and can be used as a component of maize weevil management strategy.
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