AVALIAÇÃO DE EXTRATOS VEGETAIS NO CONTROLE DE MOSCA BRANCA EM TOMATE

Abstract

In response to defense against herbivores, plants produce one versatile bioactive molecules synthesized in plant secondary metabolism. This paper aimed to evaluate the efficiency of plant extracts on the population level of whitefly nymphs on tomato cv. IPA 6, assess the number of fruits per treatment, fruit weight, ripeness and irregular pith. The experiment was installed in the field with the tomato crop IPA 6, block design, making use of substances extracted from plants, etanolic extract straw (Ipomoea carnea subsp. Fistulosa), etanolic extract castor (Ricinus communis L.), aqueous extract tingui (Mascagnia rigida Griseb ), aqueous extract Mexican poppy (Argemone mexicana L.) and neem oil (Azadirachta indica A. Juss) for the control of whitefly (Bemisia tabaci biotype B). The spraying was carried out by spraying, between 16 and 18 h, with an interval of seven days. Statistical analysis performed by WinStat and percentage of treatment efficiency calculated by Abbott (1925). The straw (72.41%) and neem oil (67.26%) were the most effective on nymphs. The number and weight of tomato fruits did not differ significantly between treatments. In relation to irregular maturation, extracts of I. carnea and M. rigida were significant. The extracts of I. carnea, M. rigida and A. Mexicana shown to be effective in controlling the pith. All plant extracts used in this experiment show efficiency on nymphs of B. tabaci.