Potent Insecticide Plant

In this chapter, we will address the effectiveness of these two powerful insecticidal plant species on the survival of eggs and larvae of Bemisia spp. (Hemiptera), Sordidus spp. (Coleoptera) and Spodoptera spp. (Lepidoptera). To obtain the essential oil, the cold pressing method described by Pinheiro and adapted by Barroso was used, where 900 g of seeds of the plant material was placed in the oven at a temperature of 45 ± 2°C for 48 h, then the seeds were crushed in a Britânia Diamante Black 4 blender at a speed of 900 W. It was pressed manually in an oil press machine. The resulting aqueous material was placed in a container and sealed with parafilm to prevent evaporation. It was left to rest in the dark at a temperature of 18 ± 2°C in an oven for 48 h. It was decanted to separate the essential oil and then filtered to remove suspended solid particles. For the Bioensio with eggs and larvae, four flasks covered with fine mesh were used, each containing 50 eggs of each species, at a temperature of 25 ± 2°C. For both cases, 2 ml of essential oil from the three prepared solutions was used. It was verified that: the essential oils of Ricinus communis are effective on the mortality of Bemisia spp., Spodoptera spp. and Sordidus spp. larvae, reaching 100% mortality in 7, 9 and 9 days of exposure, respectively; the essential oils of Azadirachta indica are effective on the mortality of Bemisiaspp., Spodoptera spp. and Sordidus spp. larvae, reaching 100% mortality in 9, 7 and 6 days of exposure, respectively; the solution of Azadirachta indica and Ricinus communis was the most effective in achieving mortality on Bemissia spp., Spodoptera spp. and Sordidus spp. in 5, 4 and 5 days, respectively.