DELAY IN MOSAIC-VIRUS ONSET AND APHID VECTOR REDUCTION IN SUMMER SQUASH GROWN ON REFLECTIVE MULCHES

Silver reflective plastic mulches were compared with conventional bare -ground culture of yellow crookneck summer squash (Cucurbita pepo L. v ar. melopepo Alef.) for reducing aphids and the following mosaic virus diseases: cucumber mosaic, watermelon mosaic I and II, zucchini yello ws mosaic, and squash mosaic. Plants grown on silver plastic mulch pro duced higher marketable yields than those grown on bare ground. Other colors (white, yellow, and black with yellow edges) of plastic mulch w ere intermediate in their effects on aphid population and virus diseas e reduction. Silver reflective mulch alone and silver reflective mulch with insecticide were superior to other colors of plastic mulch in re ducing aphid populations. Silver reflective plastic mulch, with or wit hout insecticide, resulted in 10 to 13 days delay in the onset of the mosaic diseases noted.