Mar 13, 2017

Crop Protection WCRC Croprotection-LatinAmerica WCRC1
Abstract                                                                         Back to Table of contents

The populations of Anthonomus grandis Boheman that were first reported in Brazil in the state of São Paulo in February 1983, and in the state of the Paraíba in the northeastern region in August 1983, are morphologically similar to the southeastern boll weevil of the United States. All of the principal cotton-growing states in the southern region (São Paulo, Paraná, Minas Gerais, Mato Grosso and Mato Grosso do Sul) and in the northern region (Paraíba, Pernambuco, Rio Grande do Norte, Ceará, Bahia, Piauí, Maranhão and Alagoas) are now infested by the boll weevil.

The losses caused by the boll weevil in the northern region are both direct and indirect, and extend throughout the entire social, financial and economic structure of the region. It is impossible to estimate the losses due to depreciated land value, closing down of cotton gins and oil mills, and other indirect results of the boll weevil introduction.

An estimate of the magnitude of yield loss is afforded by the gains which have been recorded from recent field studies in which boll weevil injury has been eliminated. In the states of the Paraíba and Pernambuco where the boll weevil originally caused yield losses of 54 to 87%, increases in yield of seed-cotton over control (untreated plots) varied from 116 to 657% in tests. We believe that Integrated Pest Management technology using selective insecticides, natural mortality (high temperatures and low humidity and soil moisture, predators, parasitoids and pathogens), short season cotton and stalk destruction will collectively constitute the best management approach for production of a profitable cotton crop.

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