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Post-harvest grain temperature, moisture, and insect infestation in steel granaries in Manitoba



Post-harvest grain temperature, moisture, and insect infestation in steel granaries in Manitoba



Canadian Entomologist 117(1): 7-14



Postharvest grain temperature and moisture were consistently higher at the center than at the edge roof openings of steel granaries in Manitoba in 1982 and 1983. In 1982, temperatures at the center were significantly higher in infested than in uninfested granaries and declined only slowly during a 2 wk period. Several kinds of insects [beetles] were found in grain samples or in beetle-detection traps inserted into grain at the center location but none was found in grain or in traps at the edge. The heaviest infestations coincided with the temperatures and moistures at the center. In 1983, initial temperatures at the center and edge roof openings were high when the granaries were filled but declined rapidly, particularly at the edge, during the next 2 mo. Between late Aug. when the granaries were filled and early Nov. moisture content increased at the center and edge roof openings. It was significantly greater at the surface than at a depth of 20-130 cm. Insects were found in traps inserted 1 m into the grain at the center location. The most likely place to find insects in filled granaries is at the center near the surface and the most opportune time to begin checking the grain is 2 mo. after the granaries have been filled.

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Accession: 001433030

Download citation: RISBibTeXText

DOI: 10.4039/ent1177-1


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