Gül Üzerinde Metopolophium dirhodum (Walker) (Hemiptera: Aphididae)’un Kontrolunda Bazı Doğal Ürünlerin Etkileri

Abstract

Four products allowed in organic farming (kaolin, insecticidal soap, neem oil soap, spinosad) as alternatives to chemical insecticides, were evaluated for the control of Metopolophium dirhodum (Walker, 1849) (Hem.: Aphididae). In addition, number of the newborn nymph and host selection for the treated and untreated rose (Rosa hybrida L. cv. First Red) leaves were examined. The toxicities of used natural products were compared with the diazinon and control (water). Rose saplings were used as experimental material. The application was repeated twice in the same greenhouse. Evaluations in populations were done on 1, 3, 5, 7, 10 and 14 days after applications. Insecticidal soap showed toxicity between 50.45 % and 74.0 % until fifth day and its toxicity decreased in the following days. Neem oil soap was non-toxic (15.09%–19.71%) at first application but, in the second application, its toxicity was increased (36.96%-72.27%). Repeated kaolin application ended with a positive result of 66.87% control. Spinosad had no effect on aphid. It was observed that M. dirhodum population was decreased by repeated (twice) applications of kaolin, insecticidal soap and neem oil soap. However, they could not control the aphid populations completely. In choice tests, the numbers of living aphids and newborn nymphs on rose leaflets treated with kaolin, neem oil soap, and insecticide soap were lower than those not treated. These three products were found to be repellent for M. dirhodum.