EFICIÊNCIA DE TECNOLOGIAS DE MILHO BT NO CONTROLE DE Spodoptera frugiperda

Abstract

One of the main challenges for corn producers is the control of pest insects that can attack the crop from seedling emergence to harvest. Among the pests that attack the maize, the main one is the Spodoptera frugiperda (Lepidoptera: Noctuidae) caterpillar. One of the management strategies that has been adopted to control S. frugiperda in culture of corn is the use of Bt technologies. However, during the harvests some technologies have flaws in the control of S. frugiperda. Therefore, the objective of this work was evaluate the efficiency of Bt VT PRO3, PowerCore, Leptra and Viptera 3 maize technologies in control of S. frugiperda in two planting seasons (harvest and off-season). In each planting season two field trials were conducted in the region of Montividiu and Rio Verde in Goiás, in 2019/20 harvest. The intensity of leaf damage caused by natural infestation of S. frugiperda in technologies through the Davis Scale at 25 days after emergence of seedlings (DAE), the number of live caterpillars at 25 and 85 DAE were also evaluated, as well as like damage to the ears. Non-Bt corn was used as a control treatment. Information technologies Bt corn with the protein Vip3Aa20 - Leptra and Viptera 3 showed efficiency in the control of S. frugiperda in the harvest and in the off-season. Meanwhile, VT PRO3 and PowerCore technologies do not demonstrate satisfactory efficiency for the control of S. frugiperda, mainly in the period of the crop with high pressure of the pest.