Control of insect pests of cowpea in the savanna of Roraima, Brazil. = Controle de insetos-praga do feijão-caupi na savana de Roraima.

Abstract

The objective of this study was to evaluate the effects of the insecticides acephate, imidacloprid and neem oil to control major insect pests of cowpea in cerrado of Roraima. The experiment was installed in the experimental area of the CCA/UFRR. The planting of cowpea (c.v. BRS Guariba) was carried out between the double rows of cassava (2.0 x 0.8 x 0.8 m). The rows of cowpea were spaced 0.5 m apart and 0.75 m double rows of cassava. We adopted the experimental design of randomized blocks with five treatments and four replications. The treatments were as follows: T1 - control (without application of products), T2 - Neem oil ( applied to 20, 30, 40 and 50 days after planting - DAP), T3 - Imidacloprid (20 DAP) + Acephate (30 DAP ) + Imidacloprid (40 DAP) + Acephate (50 DAP), T4 - Acephate (20 DAP) + Imidacloprid (30 DAP) + Acephate (40 DAP) + Imidacloprid (50 DAP) T5 - Imidacloprid (20 DAP) + Oil nim (30 DAP) + Acephate (40 DAE) + neem oil (50 DAP). It measured the number of plants located in the middle row with symptoms of pest attack, and the calculation of the percentage of plants attacked. It was found that all treatments were effective in controlling Aphis craccivora, the best treatments for control of Chalcodermus bimaculatus were those who had been cunning application of neem oil, that the treatment using only the neem oil was effective in controlling Aphis craccivora, Bemisia tabaci, Empoasca kraemeri and the Chalcodermus bimaculatus. The treatments used in this study were not effective to control the Cerotoma arcuatus.

Keywords

• Acephate
• Azadirachta indica
• Azadirachtin
• Imidacloprid
• Vigna unguiculata.