Resistência de cultivares de soja a Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE
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Data
2010-02-22
Autores
Veloso, Eliomar Sérgio [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A cultura da soja representa um dos elementos mais fortes da economia brasileira. Entre os fatores que limitam o potencial de produtividade da soja estão às pragas. Dentre as diferentes espécies, Spodoptera frugiperda poderá tornar-se praga importante, devido à intensa exposição da cultura à pressão populacional desse inseto. Desse modo, o presente trabalho teve por objetivo estudar a resistência de cultivares de soja a lagarta-do-cartucho, Spodoptera frugiperda (J. E. SMITH). O trabalho foi dividido em duas partes, sendo que na primeira avaliou-se a atratividade e a não-preferência alimentar, com e sem chance de escolha, de lagartas recém-eclodidas em folhas de dez cultivares de soja. os cultivares BRS Sambaíba, MG/BR-46 Conquista, BRSMT Pintado, FT Cristalina, FMT Tucunaré, MSOY 8001, M-SOY 6001, M-SOY 8400, EMGOPA 313 e BRSMT Uirapuru. No teste de atratividade utilizou-se um sistema de arena em placas de Petri com 20 cm de diâmetro e com dez repetições. Para cada repetição (arena) foram liberadas 05 lagartas recém-eclodidas de S. frugiperda, avaliando a número total de lagartas atraídas pelos discos foliares dos cultivares aos 5, 10, 15, 20, 25, 30 e 60 minutos. Para avaliação de não-preferência alimentar, no teste com chance de escolha, os procedimentos e os materiais utilizados foram os mesmos adotados no teste de atratividade. No teste, sem chance de escolha, os materiais foram individualizados em placas de Petri de 6,0 cm de diâmetro e seu interior foram liberadas 05 lagartas recém-eclodidas por repetição, com 10 repetições. Para avaliação, contou-se o número total de lagartas que estavam se alimentando nos discos foliares dos cultivares após 24 horas da liberação. Na segunda parte foi realizado estudos da biologia da S. frugiperda em cinco cultivares de soja. As lagartas recém-eclodidas foram alimentadas com folhas dos seguintes cultivares de soja...
Soybean is one of the strongest elements in Brazilian economy. Pests are among the factors that limit the productivity potential of soybean. Among pest species, Spodoptera frugiperda may become an important pest due to intense crop exposure to the population pressure by this insect. The objective of this investigation was therefore to study the resistance of soybean cultivars to the fall armyworm, Spodoptera frugiperda (J. E. SMITH). The study was divided into two parts: in the first we evaluated, in free-choice and no-choice tests, the attractiveness and nonpreference for feeding of newly-hatched caterpillars on leaves of ten soybean cultivars: BRS Sambaíba, MG/BR-46 Conquista, BRSMT Pintado, FT Cristalina, FMT Tucunaré, M-SOY 8001, M-SOY 6001, M-SOY 8400, EMGOPA 313, and BRSMT Uirapuru. An arena system was used in the attractiveness test, consisting of Petri dishes (20 cm diameter), with ten replicates. Five newly-hatched S. frugiperda caterpillars were released for each replicate (arena); counts were obtained for the total number of caterpillars attracted to the leaf discs of the various cultivars at 5, 10, 15, 20, 25, 30, and 60 minutes. In the free-choice test to evaluate non-preference for feeding, the same procedures and materials used in the attractiveness test were adopted. In the no-choice test the materials were individualized in Petri dishes (6.0 cm diameter); five newly-hatched caterpillars per replicate were released into the dishes, with 10 replicates. The test was evaluated by counting the total number of caterpillars feeding on the leaf discs of the various cultivars 24 hours after release. In the second part of the investigation we conducted studies on the biology of S. frugiperda on five soybean cultivars. Newly-hatched caterpillars were fed leaves of the following soybean cultivars: BRSMT Uirapuru, MG/BR 46 (Conquista), M-SOY 8400, M-SOY 6101, and FMT Tucunaré... (Complete abstract click electronic access below)
Soybean is one of the strongest elements in Brazilian economy. Pests are among the factors that limit the productivity potential of soybean. Among pest species, Spodoptera frugiperda may become an important pest due to intense crop exposure to the population pressure by this insect. The objective of this investigation was therefore to study the resistance of soybean cultivars to the fall armyworm, Spodoptera frugiperda (J. E. SMITH). The study was divided into two parts: in the first we evaluated, in free-choice and no-choice tests, the attractiveness and nonpreference for feeding of newly-hatched caterpillars on leaves of ten soybean cultivars: BRS Sambaíba, MG/BR-46 Conquista, BRSMT Pintado, FT Cristalina, FMT Tucunaré, M-SOY 8001, M-SOY 6001, M-SOY 8400, EMGOPA 313, and BRSMT Uirapuru. An arena system was used in the attractiveness test, consisting of Petri dishes (20 cm diameter), with ten replicates. Five newly-hatched S. frugiperda caterpillars were released for each replicate (arena); counts were obtained for the total number of caterpillars attracted to the leaf discs of the various cultivars at 5, 10, 15, 20, 25, 30, and 60 minutes. In the free-choice test to evaluate non-preference for feeding, the same procedures and materials used in the attractiveness test were adopted. In the no-choice test the materials were individualized in Petri dishes (6.0 cm diameter); five newly-hatched caterpillars per replicate were released into the dishes, with 10 replicates. The test was evaluated by counting the total number of caterpillars feeding on the leaf discs of the various cultivars 24 hours after release. In the second part of the investigation we conducted studies on the biology of S. frugiperda on five soybean cultivars. Newly-hatched caterpillars were fed leaves of the following soybean cultivars: BRSMT Uirapuru, MG/BR 46 (Conquista), M-SOY 8400, M-SOY 6101, and FMT Tucunaré... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Soja, Plantas - Resistencia, Lagarta-do-cartucho, Glycine max, Plant resistance, Fall armyworm
Como citar
VELOSO, Eliomar Sérgio. Resistência de cultivares de soja a Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE. 2010. 56 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, 2010.