H3-SH-24-D flender atb loher Helical gear boxes H3

Flender/Flender Gear Units/Helical gear boxes H3

Canada 1 INTRODUCTION Controlled atmospheres (CA) are used as periodic treatments to control pests (insects and mites) in stored grain or, less frequently, as long-term storage environments to prevent pest occurrence (insects, mites, and molds) or spontaneous combustion, as in poppy seedsthat must be stored in nitrogen gas (Mills, . The CAs contain either high levels ofcarbon dioxide (CO , or high levels of nitrogen ( , with virtual elimination of oxygen ( . Grain in bulk storage is an immature ecosystem (Sinha, consisting of the living grain itself, numerous species of insects, mites, and molds, both on and in the seed. The nonliving part of the system includes humidity and grain moisture, temperature, andintergranular gases. When the grain is warm ( /H1C) or becomes moist, owing to bin leakage or to moisture migration by convection currents, the biological organisms beginto respire. Oxygen is consumed and heat, moisture, and carbon dioxide are produced. Canada has legally dened zero-tolerance for insect pests in stored grain; hence, they must be controlled whenever detected. Dozens of insects are found in stored grain (Sinha and Watters, in low numbers, and many are fungus feeders that do not directly feed on the grain (White et al., 1a). The most common grain-feeding insectsin western Canada are the rusty grain beetle, Cryptolestes ferrugineus (Stephens) and the red our beetle, Tribolium castaneum (Herbst), often being detected in up to 4% of farm granaries (Madrid et al., . The whole-seed feedersthe rice weevil Sitophilus oryzae 2 White and Jayas . and the lesser grain borer Rhyzopertha dominica .are present (Madrid et al., 1; Fields et al., , but rarely become established in farm-stored grain because they multi-ply relatively slowly (Fields and White, , and the grain generally cools down afterharvest. Few contact insecticides are registered for use on grain because of residue problems (White and Leesch, . The fumigant methyl bromide is