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The overall need for pest and infestation control depends on the duration, storage conditions and type of commodities stored. Food in particular is sensitive to attracting pests, and agencies specializing in food may have special fumigation schedules. A general best practice is to enact fumigation once every six months, however ideally stock should rotate quickly enough to avoid the need for fumigation. In other instances, fumigation may be required every 3-4 months, or as soon as an infestation is discovered. As a general rule , most insect pests under humid tropical conditions can be expected to multiply about 50 -fold every 6 six weeks, meaning an untreated infestation can become a large problem very quickly.

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