Effect of Different Dosages of Garlic Extracts on Mortality of Margarodes vitis Cysts

Abstract

Margarodes vitis is a subterranean sucking plant insect that causes severe damage on vineyards established in the central valley of Chile. Currently, there are few alternatives for M. vitis control, mainly due to its underground behavior. This pest parasitizes roots affecting the viability of the vine. The aim of this work was to evaluate the effect of different concentrations of an aqueous purple garlic extract on the mortality of cysts of M. vitis on Carmenère (Vitis vinifera L.) vines under experimental conditions. Thus, four treatments were performed at a concentration of 50, 100, 150 and 200g/L of the purple garlic extract. These treatments were compared with a control, in which distilled water was applied. The results showed that the applications performed at a concentration above 50g/L of purple garlic extract produced a higher mortality of cysts compared to the control. However, the application of 50g/L of the purple garlic extract did not have a significant effect on the mortality of the cysts of M. vitis compared to the control. These results are promising since the purple garlic extract could be evaluated on the mortality of other stages of the M. vitis life cycle to optimize its control.