Journal of Economic Entomology (1998) 91, 280-286

Bh. Subramanyam, N. Madamanchi and S. Norwood (1998)
Effectiveness of Insecto applied to shelled maize against stored-product insect larvae
Journal of Economic Entomology 91 (1), 280-286
Abstract: Insecto, a marine diatomaceous earth, is recommended for grain application at 0.5-1 g of formulation per kilogram of grain to control stored-product insects. Mortality and adult emergence of the red flour beetle, Tribolium castaneum (Herbst), sawtoothed grain beetle, Oryzaephilus surinamensis (L.), and Indianmeal moth, Plodia interpunctella (Hübner), exposed as 1st instars to shelled maize, Zea mays L., treated with different rates of Insecto were evaluated in the laboratory. For each species, mortality of 1st instars increased with Insecto rate. All 1st instars of T. castaneum were killed at 0.5 and 1 g/ kg rates of Insecto; at these rates, mortality of O. surinamensis and P. interpunctella 1st instars was 96-97 and 86-97%, respectively. The percentage of adults of the 3 species emerging from 1st instars exposed to treated maize was related inversely to Insecto rate. Complete suppression in emergence of T. castaneum and P. interpunctella adults was achieved at 1 g/kg; at this rate, suppression in emergence of O. surinamensis adults was 98%. Emergence of P. interpunctella adults from 1st, 3rd, and 5th instars exposed to Insecto-treated maize indicated that 1st and 3rd instars of P. interpunctella were more susceptible than 5th instars to Insecto. At 0.5 and 1 g/ kg of Insecto, suppression in emergence. of P. interpunctella adults from exposed 1st, 3rd, and 5th instars was 99-100, 73-92, and 6-37%, respectively. A 2-parameter negative exponential regression model best described the relationship between mean adult emergence and Insecto rate for the species and instars tested.
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Database assignments for author(s): Bhadriraju Subramanyam

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tribolium castaneum	Stored grain
	Plodia interpunctella	Stored grain
	Oryzaephilus surinamensis	Stored grain