The effectiveness of abamectin insecticide in suppressing the population of Liriomyza spp (Diptera: Agromysidae) on red onions

This research was aimed to analyze the effect of insecticide application on the population abundance and fluctuation, the attack percentage and the production of local Lembah Palu red onions, as well as the abundance of parasitoids Liriomyza spp. The work was conducted in the farmers’ fields. There were two treatments, namely abamectin insecticide and without abamectin insecticide. The intensity of Liriomyza spp. applied with Abamectin insecticide was lower (33.84%) compared with the non-treated one (62% on 6 weeks after planting). The effect of Abamectin insecticide lowered the attack percentage than non-treated. The non-treated plots had more population of H. varicornis (67.17%) and N. formosa (28.78%). The average production of red onion applied with insecticide was 9.61 tons per hectare it was higher in comparison with the non-treated one (8.20 tons per hectare). The application of Abamectin insecticide was effective in suppressing the growth of Liriomyza spp. population.