Bioplaguicide effect of vegetal extracts to control of Spodoptera frugiperda in corn crop (Zea mays).
The corn crop is the second largest cereal in Colombia with 21.9% of the total area produced. The plague Spodoptera frugiperda, attacks the plant from the first weeks of growth, devouring its leaves, stalk and grains; decreasing crop yield. This pest is controlled by the non-controlled use of synthetic pesticides such as, carbofuran, chlorpyrifos and atrazine. In this research, the extracts of Azadirachta indica, Piper nigrum, Petiveria alliacea and their mixtures; and extracts of Nicotiana tabacum, Lippia alba, Allium sativum and their mixtures, were applied as bioplaguicides in corn plants. The application was performed twice a day each two days for seven weeks, after of third week of growth (when the larvae were first observed). The number of dead larvae, plant height and damage in leaves and stems were the study variables. The treated plants grew twice and their degree of affection, according to the Mihm scale, was lesser than plants in the control group. The efficiency percentages of the six plant species and its mixture were representative (>80%), in according to Henderson and Tilton, resulting in these plant extracts are a viable alternative for pest control of S. frugiperda.