Resistência ao tripes do prateamento Enneothrips flavens Moulton (Thysanoptera: Thripidae) e potencial produtivo de genótipos de amendoim
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Data
2003-02-05
Autores
Perozini, Alexandre Caetano [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O tripes do prateamento Enneothrips flavens é considerado uma praga limitante a produção de amendoim e o uso de cultivares resistentes evita ou reduz a aplicação de inseticida proporcionando uma maior segurança e lucratividade à atividade. O trabalho foi realizado com os objetivos de avaliar a resistência ao tripes e o potencial produtivo de genótipos de amendoim. Os experimentos foram conduzidos na Fazenda de Ensino e Pesquisa da UNESP/Ilha Solteira, localizada no município de Selvíria-MS. Os dois primeiros experimentos foram instalados na época das águas com semeadura realizada em 12/11/2001 com os genótipos: 1 - IAC-Tatu-ST, IAC 81-12, IAC 88-1, IAC 88-2, IAC 22 e IAC 24, de hábito de crescimento ereto; 2 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua e IAC 5024, hábito de crescimento rasteiro. O terceiro e quarto experimentos foram instalados na época da seca com semeadura realizada em 03/02/2002 com os genótipos: 3 - IAC-Tatu-ST, IAC 81- 12, IAC 88-1, IAC 88-2, IAC 22 e IAC 24, hábito de crescimento ereto, com e sem inseticida e 4 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua e IAC 5024, de hábito de crescimento rasteiro, com e sem inseticida. Nas amostragens foram realizadas contagens de adultos e ninfas de tripes; avaliações de sintomas de danos, de área foliar, de altura de plantas e da produção. Os resultados mostram que as ninfas e adultos mais ninfas por apresentarem populações mais expressivas são mais adequadas para avaliação da resistência de genótipos de amendoim a E. flavens; o sistema de avaliação por atribuição de notas mostrou-se adequado para avaliação de resistência de genótipos de amendoim a E. flavens; nos genótipos de crescimento ereto a maior população de E. flavens ocorre dos 30 aos 72 dias após a emergência das plantas...
The silvering thrips Enneothrips flavens is considered to be a restrictive plague regarding the peanut production, and the use of resistant cultivars avoids or decreases the insecticide application turning the activity and profitability safer. The study was performed in order to evaluate peanut genotypes resistance to thrips and their production potential. The experiments were conducted at the Research and Teaching Facilities Farm of the Engineering University-FE/UNESP, located in Selvíria-MS. The first two experiments were installed at that time of the waters with planting accomplished in 12/11/2001 with the genotypes: 1 - IAC- Tatu-ST, IAC 81-12, IAC 88-1, IAC 88-2, IAC 22 and IAC 24, habit of erect growth; 2 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua and IAC 5024, habit of low growth; The third and fourth experiments were installed at that time of the drought with planting accomplished in 03/02/2002 with the genotypes: 3 - IAC-Tatu-ST, IAC 81-12, IAC 88-1, IAC 88-2, IAC 22 and IAC 24, habit of erect growth, with and without insecticide and 4 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua and IAC 5024, habit of low growth, with and without insecticide. In the samplings, adults and nymphs were counted and damage symptoms of the leaf area and the plants’ height and production were evaluated. The results show that populations of nymphs and populations of nymphs plus adults are more appropriate for the evaluation of the peanut genotypes resistance to E. flavens, as they are more expressive; the grading system proved itself to be appropriate to the evaluation of the peanut genotypes resistance to E. flavens; in the erect growth genotypes, the larger population of E. flavens occurs from the 30 th to the 72 nd day after the plants emerge; the erect growth genotypes IAC 88-1 and IAC-Tatu-ST... (Complete abstract click electronic access below)
The silvering thrips Enneothrips flavens is considered to be a restrictive plague regarding the peanut production, and the use of resistant cultivars avoids or decreases the insecticide application turning the activity and profitability safer. The study was performed in order to evaluate peanut genotypes resistance to thrips and their production potential. The experiments were conducted at the Research and Teaching Facilities Farm of the Engineering University-FE/UNESP, located in Selvíria-MS. The first two experiments were installed at that time of the waters with planting accomplished in 12/11/2001 with the genotypes: 1 - IAC- Tatu-ST, IAC 81-12, IAC 88-1, IAC 88-2, IAC 22 and IAC 24, habit of erect growth; 2 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua and IAC 5024, habit of low growth; The third and fourth experiments were installed at that time of the drought with planting accomplished in 03/02/2002 with the genotypes: 3 - IAC-Tatu-ST, IAC 81-12, IAC 88-1, IAC 88-2, IAC 22 and IAC 24, habit of erect growth, with and without insecticide and 4 - Nahuel, IAC Caiapó, IAC Jumbo, Cavalo, Tégua and IAC 5024, habit of low growth, with and without insecticide. In the samplings, adults and nymphs were counted and damage symptoms of the leaf area and the plants’ height and production were evaluated. The results show that populations of nymphs and populations of nymphs plus adults are more appropriate for the evaluation of the peanut genotypes resistance to E. flavens, as they are more expressive; the grading system proved itself to be appropriate to the evaluation of the peanut genotypes resistance to E. flavens; in the erect growth genotypes, the larger population of E. flavens occurs from the 30 th to the 72 nd day after the plants emerge; the erect growth genotypes IAC 88-1 and IAC-Tatu-ST... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Amendoim - Controle de pragas, Amendoim - Resistência, Peannut production - Plague control
Como citar
PEROZINI, Alexandre Caetano. Resistência ao tripes do prateamento Enneothrips flavens Moulton (Thysanoptera: Thripidae) e potencial produtivo de genótipos de amendoim. 2003. xviii, 106 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, 2003.