Insect Infestation in Grain Loaded in Railroad Cars at Primary Elevators in Southern Manitoba, Canada

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Abstract
Infestation by the rusty grain beetle, Cryptolestes ferrugineus (Stephens), was found in the grain loaded in 47 (38%)of 125 railroad cars in 1977 and in 72 (53%)of 136 cars in 1978 at primary elevators near Winnipeg, Manitoba. The grain loaded in about half of the cars contained larvae only. Mites were found in the grain loaded in 78 and 90% of the railroad cars in 1977 and 1978, respectively. Other insects found, in order of decreasing frequency, were psocids, dermestid larvae, and fungus beetles. Oryzaephilus surinamensis (L.), Tribolium castaneum (Herbst), Palorus subdepressus (Wollaston), Tenebrio molitor (L.), and Sitophilus granarius (L.) were found in the grain loaded in five or fewer cars in 1977 and 1978. No more than 6% of the infested carloads found at primary elevators were detected by inspectors at terminal elevators. Less than 5% of the carloads of grain sampled contained rusty grain beetles from grain delivered directly from the farm.

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