identificação de fontes de resistência de milho à spodoptera frugiperda (j. e. smith, 1797) (lepidoptera: noctuidae) em campo

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2000
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Abstract
Com o objetivo de identificar fontes de resistência à Spodoptera frugiperda (J. E. Smith, 1797), foram avaliadas as cultivares de milho CMS-22, CMS-35, AG-106, Dina-70, AG-510 e CMS-36 em campo, utilizando-se o delineamento experimental de blocos ao acaso com quatro repetições. Utilizaram-se as variáveis: danos foliares, obtidos através da escala visual de notas, sobrevivência, peso e comprimento das lagartas, 10 dias após a infestação artificial das plantas com lagartas de 1º ínstar. As cultivares diferiram significativamente (P=0,05) apenas com relação aos danos, destacando-se AG-510 como a mais resistente, com dano médio de 5,41 em comparação com CMS-35 e AG-106, as mais suscetíveis, com danos médios de 8,38 e 7,85 respectivamente. Foram determinadas correlações lineares significativas (p=0,01) entre os danos e peso de lagartas, danos e comprimento de lagartas e peso e comprimento de lagartas, indicando a possibilidade de utilização dessas variáveis nos estudos de resistência de milho a S. frugiperda.
The objective of this work was to identify sources of resistance to Spodoptera frugiperda (J. E. Smith) in six corn cultivars (CMS-22, CMS-35, AG-106, Dina-70, AG-510 and CMS-36) which were tested under field conditions using a complete randomized block design with four replications. The following parameters were observed: a) foliar damage, obtained through a visual note scale; b) larvae survival, weigth and length, measured 10 days after artificial plant infestation. There were significant statistical differences (P=0.05) among cultivars only in relation to foliar damage, being AG 510 the most resistant cultivar with an average damage of 5.41. The most susceptible cultivars were CMS 35 and AG 106 which had an average damage of 8.38 and 7.85 respectively. Significant linear correlations (P=0.01) were found between foliar damage and larvae weigth; foliar damage and larvae length; and larvae weigth and larvae length, indicating the possibility of utilization of these parameters to evaluate resistance of corn cultivars to S. frugiperda.
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Authors ;Deise Maria P. da Silva;José V. de Oliveira;José Nildo Tabosa;Reginaldo Barros;Elton O. dos Santos;Simone S. Azevedo
Journal current drug delivery
Year 2000
DOI
10.1590/S1516-89132000000300015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300015
Keywords
zea mays fall armyworm

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