Effect of Dockage in the Infestation of Wheat by Some Stored-product Insects1

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Abstract
Survival, development, and multiplication of 9 species and 1 mutant of stored-product insects on clean Manitou wheat and wheat with various percentages of dockage in 10-g food lots were determined at 27±0.5°, 30±0.5°, and 33±0.5°C and 70±2% RH. Dockage comprised 12 components including wild buckwheat, broken wheat, small wheat kernels, and various weed seeds. When reared on clean wheat and on wheat with 2, 5, and 7% dockage at 27±0.5°C, the proponion of eggs that developed to adults was high for Cryptolestes ferrugineus (Stephens), moderate and low for C. turcicus (Grouville), Oryzaephilus mercator (Fauvel), O. surinamensis (L.), Stegobium paniceum (L.), Tribolium castaneum (Herbst), and T. confusum Jacquelin duVal. Presence of dockage significantly increased (P<0.01) the number of adults developing from eggs at the 7% dockage level in O. surinamensis . Adult survival of Ahasverus advena (Waltl) was adversely affected by higher dockage levels at 30±0.5°C and 33±0.5°C but not at 27±0.5°C. Presence of dockage at the 5% level significantly increased the adult emergence of T. audex Halstead at 27±0.5°C and of a T. confusum black mutant at 33±0.5°C. Both 5 and 10% dockage at 33±0.5°C significantly affected adult emergence and the rate of multiplication of F1 progeny of C. ferrugineus, O. surinamensis , and T. castaneum reared on 150-g lots of wheat. O. surinamensis was favorably affected by increasingly high levels of dockage. At 33°C optimum temperature, T. castaneum , unlike O. surinamensis , multiplied well on dockage-free wheat. T. castaneum was favorably affected by dockage only at the 10% level, whereas C. ferrugineus was adversely affected by dockage.

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