Main content area

Row covers effect on sweetpotato whitefly (Homoptera: Aleyrodidae) densities, incidence of silverleaf, and crop yield in zucchini

Costa, H.S., Johnson, M.W., Ullman, D.E.
Journal of economic entomology 1994 v.87 no.6 pp. 1616-1621
Cucurbita pepo, Bemisia tabaci, Aphis gossypii, population density, plant diseases and disorders, crop yield, crop quality, incidence, cultural control, insect control, disease control, Bemisia argentifolii, disease severity, polyethylene film, Hawaii
The use of polyethylene row covers is an effective method to reduce whitefly, Bemisia tabaci Gennadius, and aphid, Aphis gossypii Glover, densities and the incidence of squash silverleaf in zucchini. Mean densities of whiteflies and aphids were significantly lower in row-cover treated plots than in untreated plots. Under conditions of low silverleaf incidence (< 25% of plants with symptoms), row-cover treatments reduced the incidence of silverleaf, although no significant increase in yield per plant was found, and no relationship between silverleaf incidence and yield was found. Under high levels of silverleaf (> 50% of plants with symptoms), there was a significantly higher total marketable yield per plant in row-cover treated plots than in pesticide-treated or untreated plots. In addition, increased yields were correlated with lower ratings of silverleaf severity and lower proportions of plants with silverleaf.