Avaliação do efeito da aplicação de produtos naturais no controlo da mosca-branca no coqueiro

Abstract

The whitefly is one of the main pests on coconut in Mozambique, which among other factors, reduce the yield of this crop. This study aimed to evaluate the effect of natural products on the control of nymphs and adults of the whitefly on the coconut tree. For this purpose, two (2) experiments were conducted in the laboratory of the Faculty of Agronomy and Forestry Engineering (FAEF) from January to June 2013. The first experiment was for the control of nymphs and the second for adults using various products such as : cassava peel and pulp (Manihot esculenta), marsh seed and leaf (Azadiractina indica), syringe leaf (Melia azadirach), lemongrass (Cymbopogon citrates), soybean oils (Glycine max), sunflower (Helianthus annuus) , diatomite having as positive control the insecticides abamectin, imidacloprid and as a distilled water control. The evaluated parameters were percentage of mortality, efficiency of the pesticide and Lethal Concentration 50% of individuals (CL 50). The best results in nymph mortality and efficiency were obtained with the use of cassava peel (98 and 97.8%), seed and marlosa leaf (94 and 93.3%; 86 and 84.4%), syringe leaf (80 and 77.7% ), soybean oil (98 and 93.3%) and imidacloprid (100%). The same products had a CL 50 of 23g, 45g, 81g, 97g, 55, 41 ml and 0.55 ml, respectively. With regard to whitefly adults, the highest mortality and efficiency were observed with the use of loam seed (68 and 64.1%), soybean oil (89 and 87.8%) and imidacloprid (95%) with CL 50 of 109g, 62mL and 1 mL, respectively (TRADUÇÃO NOSSA)