Release of two predators and two parasitoids to control aphids and whiteflies

The potential of the two predators, Chrysoperla carnea Steph. and Coccinell a undecimpunctata Reich., as well as the two parasitoids Diaeretiella rapae and Eretmocerus mundus in an open field and under green house were conduct ed after several releases against Aphis gossypii, A. fabae, Brevicorine bra ssicae and Bemisia tabaci. Double releases of C. carnea (1:5 predator: aphids) achieved 100% reduction in A. gossypii after 12 days, A single release of C. undecimpunctata (1:50 predator: aphids) resulted in 99.97% reduction in the same aphid. Releasin g of D. rapae to control B. brassicae at the rate of 1:50 resulted in 29% p arasitism. Releasing E, mundus for the control of B. tabaci in cabbage at t he rate of 5 adults/m(2) resulted in 32% parasitism. Three releases of C. undecimpunctata adults in a greenhouse cultivated with soybean, decreased A. fabae population from 207 to 7.6 aphids/plant.