Occurrence of insects and use of natural and synthetic insecticides in the storage of seeds of wild radish

Abstract

Knowing the importance of preventive use of insecticides for seed treatment, this study aimed to identify potential insect pests of storage for seeds of radish by means of traps set on the field for six months and to evaluate the effect of natural and synthetic substances insecticides on the emergence of radish seedlings stored for 120 days. The bioassay, field-level, was conducted over a period of six months in the following environments: savannah, area of cultivation of crops, pasture and forest at the Federal Institute Goiano. For each of these environments were placed five traps made of PET bottles, containing respectively in maize, millet, soybean, crambe and wild radish. The traps were inspected every seven days to verify the the occurrence of insects plague. The substances were: 1) saffron, 2) limestone, 3) Gray, 4) neem, 5) diatomaceous earth, 6) chlorpyrifos, 7) deltamethrin and 8) control treatment. The experimental design was randomized blocks in factorial scheme 8 x 2 (8 substances and two storage periods, is not stored seeds and seeds stored for 120 days) with four replications. Were evaluated the percentage of emergence, hold rate of emergence, time to reach 50% emergence and the record of the dry mass of seedlings. The natural and synthetic substances do not interfere with seedling emergence in seeds of wild radish, even after storage for 120 days in a room. In the traps in the field, containing seeds of wild radish noted the presence of the insect Carpophilus sp.