 Leaves appear brownish and/or silvery where the thrips have fed Bean Thrips Adult bean thrips are 1 mm long, cigar-shaped, and dark brown. The front wings have two light- and three dark-brown areas. Nymphs are light yellow-green with red markings on their top side. Plant tissues are damaged when thrips rasp the epidermal cells causing a whitening or “silvering” and desiccation of the leaf surface. Host plants: beans, other legumes, grasses, field and forage crops.
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