Resistência de genótipos de algodoeiro (Gossypium hirsutum L.) a Alabama argillacea (Hübner) (Lepidoptera: Noctuidae)
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Data
2001-06-01
Autores
SANTOS, TEREZINHA M. DOS [UNESP]
BOIÇA JÚNIOR, ARLINDO L. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Entomológica do Brasil
Resumo
Avaliou-se a resistência de onze genótipos de algodoeiro a A. argillacea, considerando-se aspectos biológicos das fases jovem e adulta deste inseto. Os ensaios foram realizados em câmara climatizada mantida a 25±1ºC, umidade relativa de 70±10% e fotofase de 12h. A duração do primeiro ínstar foi significativamente maior quando lagartas de A. argillacea alimentaram-se dos genótipos CNPA 94/139 e CNPA Precoce 1. Durante o segundo ínstar, as lagartas que se alimentaram do genótipo CNPA 94/139 apresentaram período significativamente menor. O intervalo de variação para a duração do terceiro e quarto ínstares foram, respectivamente, de 1,8 a 2,1 e 1,9 a 2,2 dias. As lagartas de A. argillacea que se alimentaram da cultivar CNPA Precoce 2 apresentaram uma duração do quinto ínstar de 4,9 dias. O peso médio das lagartas foi menor quando alimentadas com o genótipo CNPA Precoce 1. Os períodos pré-pupal e pupal apresentaram intervalo de variação de 1,0 a 1,9 e 7,8 a 8,7 dias, respectivamente. O intervalo de variação para a fase larval foi de 13,1 a 14,7 dias. Os genótipos CNPA Precoce 1, Precoce 2, 9211-18 e 9211-21 promoveram uma duração significativamente maior para o período larva-adulto. Durante as fases larval e larva-adulto, lagartas que consumiram folhas dos genótipos CNPA 9211-41 e CNPA 9211-31 apresentaram menor percentual de sobrevivência, respectivamente 64,2 e 60,7; 62,1 e 58,6%. Fêmeas de A. argillacea originadas de lagartas alimentadas com o genótipo CNPA Precoce 1 apresentaram menor período de oviposição e menor capacidade de postura. Concluiu-se que os genótipos CNPA 9211-31, CNPA Precoce 1, CNPA Precoce 2 e CNPA 9211-41 apresentaram resistência do tipo antibiose e/ou não-preferência para alimentação, enquanto que GL2 GL3 e CNPA 9211-29 foram suscetíveis ao curuquerê.
Eleven cotton genotypes were evaluated for resistance to A. argillacea, considering biological aspects of young and adult phases of this insect. The trials were conducted in climatic chambers at 25±1ºC under relative humidity of 70±10% and photophase of 12h. The first instar was significantly larger when A. argillacea fed on CNPA 94/139 and CNPA Precoce 1 genotypes. During the second instar, the cotton leafworm fed CNPA 94/139 genotype presented significantly shorter period. The variation interval for the third and fourth instars duration was, respectively, 1.8 to 2.1 and 1.9 to 2.2 days. The cotton leafworm fed CNPA Precoce 2 presented fifth instar duration of 4.9 days. The leafworms average weight at 5 days of age was lower when fed CNPA Precoce 1 genotype. The pre-pupal and pupal periods ranged from 1.0 to 1.9 and 7.8 to 8.7 days, respectively. The interval variation for the larval phase was 13.1 to 14.7 days. CNPA Precoce 1, CNPA Precoce 2, CNPA 9211-18 and CNPA 9211-21 genotypes promoted significantly higher duration larva-adult period. During the larval and larva to adult periods, the leafworms fed CNPA 9211-41 and CNPA 9211-31 genotypes leaves presented lower survival rates, 64.2 and 60.7; 62.1 and 58.6% respectively. A. argillacea females originated from leafworms fed CNPA Precoce 1 genotype showed shorter oviposition period and lower number of eggs laid. It was concluded that CNPA 9211-31, CNPA Precoce 1, CNPA Precoce 2 and CNPA 9211-41 genotypes showed antibiosis and/or feeding nonpreference resistance, while GL2 GL3 and CNPA 9211-29 were susceptible to cotton leafworm.
Eleven cotton genotypes were evaluated for resistance to A. argillacea, considering biological aspects of young and adult phases of this insect. The trials were conducted in climatic chambers at 25±1ºC under relative humidity of 70±10% and photophase of 12h. The first instar was significantly larger when A. argillacea fed on CNPA 94/139 and CNPA Precoce 1 genotypes. During the second instar, the cotton leafworm fed CNPA 94/139 genotype presented significantly shorter period. The variation interval for the third and fourth instars duration was, respectively, 1.8 to 2.1 and 1.9 to 2.2 days. The cotton leafworm fed CNPA Precoce 2 presented fifth instar duration of 4.9 days. The leafworms average weight at 5 days of age was lower when fed CNPA Precoce 1 genotype. The pre-pupal and pupal periods ranged from 1.0 to 1.9 and 7.8 to 8.7 days, respectively. The interval variation for the larval phase was 13.1 to 14.7 days. CNPA Precoce 1, CNPA Precoce 2, CNPA 9211-18 and CNPA 9211-21 genotypes promoted significantly higher duration larva-adult period. During the larval and larva to adult periods, the leafworms fed CNPA 9211-41 and CNPA 9211-31 genotypes leaves presented lower survival rates, 64.2 and 60.7; 62.1 and 58.6% respectively. A. argillacea females originated from leafworms fed CNPA Precoce 1 genotype showed shorter oviposition period and lower number of eggs laid. It was concluded that CNPA 9211-31, CNPA Precoce 1, CNPA Precoce 2 and CNPA 9211-41 genotypes showed antibiosis and/or feeding nonpreference resistance, while GL2 GL3 and CNPA 9211-29 were susceptible to cotton leafworm.
Descrição
Palavras-chave
Insecta, Host plant resistance, Leafworm cotton, Biology, Insecta, Resistência de plantas, Curuquerê do algodoeiro, Biologia
Como citar
Neotropical Entomology. Sociedade Entomológica do Brasil, v. 30, n. 2, p. 0-0, 2001.