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Succinic Acid-2,2-Dimethylhydrazide (SADH) Prevents Whitefly Population Increase1


SADH is utilized in the floricultural industry to control plant ht, increase stem diam, and darken foliage. At the end of an experiment which was primarily devised to determine the effective duration of SADH on petunia (Petunia hybrida Vilm.) cv. Plum Purple, we noted greenhouse whiteflies, Trialeurodes vaporariorum (Westwood), were abundant on the lower surfaces of most leaves on every stem of untreated plants, whereas treated plants were virtually pest-free. Closer examination showed that the leaves on SADH-treated petunias bore a considerable number of whitefly eggs. However, unlike the untreated plants, which sustained very large no. of the insect pest in all stages of development, there were only isolated instances of first instar nymphs and even fewer second, third, or fourth stages on the treated plants. This indicated that although adults do not avoid laying eggs on the sprayed petunias, population build-up does not occur.