Abstract
Abstract Production of commercial lettuce Lactuca sativa L. is plagued by a wide range of diseases and insects not yet controlled or only imperfectly controlled. These include the viral, virus-like, and mycoplasma diseases such as lettuce mosaic, cucumber mosaic, broad bean wilt, western yellows, big vein, and aster yellows; the fungal diseases—downy mildew and sclerotinia drop; and such insect pests as cabbage looper, beet army worm, white flies, and several species of aphids.
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