Examinando por Autor "Pérez, Misael Jorge"

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Control efficacy of Spodoptera frujiperda using the entomopathogens Heterorhabditis bacteriophora and Metarhizium anisopliae with insecticide mixtures in corn
(Universidad EARTH, 2016-12) Bissiwu, Philip; Pérez, Misael Jorge; Walter, Ndonkeu Tita
One of the major concerns in agriculture nowadays is finding efficacy control measures for insect pests. Spodoptera frugiperda has been one of the most devastating pest in corn production and has caused huge significant yield losses over the years. This pest has been the center of interest in many research works to find an effective control method that can significantly suppress its population below the economic threshold. The entomopathogenic nematodes Heterorhabditis bacteriophora and entomopathogenic fungi Metarhizium anisopliae are the most used entomopathogens in biological control of pest worldwide. They have been proven to be virulent and lethal to the S. frugiperda and their combined effect produces synergism and an additive effect and increases the percentage mortality of the S. frugiperda. In this study, these entomopathogens were mixed with a previously screened compatible insecticides Imidacloprid, chlorpyrifos and diazinon at different combinations and were assayed for their synergistic and addictive effects as efficacy control for the Spodoptera frugiperda in corn under field conditions. The results indicated that the combination of the EPN Heterorhabditis bacteriophora + EPF Metarhizium anisopliae was more lethal to S. frugiperda followed by the H. bacteriophora + M. anisopliae + chlorpyrifos combination producing a 100 % and 93.33 % mortality despite the fact that no significant statistical difference was found between these treatments. An evaluation of the foliage damage index of the corn disclosed that the combinations H. bacteriophora + M. anisopliae + chlorpyrifos were the best and produced the minimum foliage damage index of 2.73 on a visual scale of 9. No statistical significant difference was found between the treatments when the feeding effect of the S. frugiperda larvae on the vertical growth and the yield were evaluated.