Checking wheat for pests. A man sifting stored grain to detect adult weevils. This method has been used for centuries to test stored grain for signs of infestation. Weevils are beetles that lay their eggs inside grains, which the larvae use as a food supply. Sifting can only detect adult weevils, not the destructive larvae.

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TOP03210793

Source:

達志影像

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RM

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須由TPG 完整授權

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