Activity of 1st-instar Diaprepes abbreviatus (L.) was studied to determine their susceptibility to biological and cultural control and to obtain the minimum amount of information needed to develop a bioassay for soil insecticides against the larvae. Results showed that eggs in egg masses between leaves hatched (144 to 224 h after oviposition) before the larvae dropped to the ground (235 to 248 h after oviposition). Larvae remained on the soil surface no longer than 3 h, between 1100 and 2400 h, and penetrated soil optimally (P = 0.05) when its moisture was between 7 and 16.7%. They did not penetrate dry soil. Larvae that were 64 h old penetrated soil most effectively (P = 0.05). A prototype soil-insecticide bioassay chamber developed on the basis of these data showed that 84% of larvae penetrated 10 cm of soil in 13 days.
Document Type: Research Article
Publication date: June 1, 1983
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