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Searching rate and potential of some natural enemies as bio‐agent against the cotton whitefly, Bemisia tabaci Genn. (Hom., Aleyrodidae)

Abstract: The searching rate of the two aphelinid parasitoids, Eretmocerns mundas Merc. and Prospaltella lutea Masi, and the two predators, Chrysoperla carnea Steph. and Coccinella undecimpunctata L., were evaluated on Bemisia tabaci in the laboratory. Analysis of the obtained data indicated that E. mundus had a high searching rate with relatively low mutual interference in comparison with P. lutea. C. carnea also showed a higher searching rate than C. undecimpunctata. E. mundus exhibited a higher density dependent response to B. tabaci population on Lantana camara than P. lutea in October and December, while P. lutea exhibited the same response in August. Key factor analysis proved that the first instar larvae had the highest rate of mortality among the immature stages. Mortality caused by E. mundus contributed with high fate of total generation mortality (K) in comparison with P. lutea. The same result was obtained in the case of C. carnea against C. undecimpunctata.