The effects of Annonaceae and Amaryllidaceae extracts in controlling the Thrips tabaci Lindeman (Thysanoptera: Thripidae)

Abstract

The objective of the present study was to evaluate the effects of Annona muricata and Allium fistulosum extracts in controlling Thrips tabaci and to identify the main secondary metabolites. We obtained extracts from A. muricata seeds and of A. fistulosum L. leaves. An in vitro model for evaluating insecticide against T. tabaci was performed. The effect of the extracts was individually and subsequently assessed in mixtures for determining the mean lethal concentration. According to the results obtained with T. tabaci, the A. muricata L. extract showed LC50 = 82.93 mg L-1, the essential oil showed LC50 = 335.29 mg L-1, and the hydrolate showed LC50 = 2348.84 mg L-1. The combinations of extracts reached mortality rates between 50% and 72.62%, which are promising results as alternatives for the comprehensive management of this pest. The analysis of the Annonaceae extract using HPLC indicated the presence of acetogenins and alkaloids, and the analysis of A. fistulosum L. extracts using GC-MS showed the presence of volatile sulfur compounds. The phenol and total flavonoid contents were also determined in the essential oil and in the A. fistulosum L. hydrolate.