Reproduction of Stored-Grain Insects on Varieties of Wheat, Oats, and Barley1

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Abstract
Reproduction of 5 cosmopolitan species of stored-grain insects on as many as 39 varieties of cereal grain grown in western Canada in 1965–66 was determined. Resistance of a cereal to an insect was assumed to be inversely related to reproduction of that insect. The granary weevil, Sitophilus granarius (L.), and the lesser grain borer Rhysopertha dominica (F.), did not multiply on unbroken seeds of hulled oats, but S. granarius multiplied on the hulless variety ‘Vicar.’ The rusty grain beetle, Cryptolestcs ferrugineus (Stephens); the red flour beetle, Tribolium castaneum (Herbst); and the confused flour beetle, T. confusum Jacquelin duVal, developed and reproduced best on crushed oats. Differences (PTriticum dicoccunt Schübl. was the most resistant of the cereals tested to whole-grain feeding insects and most susceptible to broken-grain feeders. The extent of resistance by a variety to whole-grain feeding insects may be related to the presence and nature of the hull on the cereal.

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