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- W2134153943 abstract "Early instar Heliothis zea (Boddie) (Lepidoptera: Noctuidae) established on all stages of soybean (Glycine max [L.] Merrill) tested when larvae were confined to plants, although establishment decreased after podset stage and as seeds matured. In tests where larvae were allowed to disperse freely on plants, establishment also decreased as maturity increased, but was much lower in each stage than when confined to plants. Neonate larvae settled more quickly on terminals and expanding trifoliates than on mature trifoliates based on initiation of feeding and movement away from initial sites of placement. The ability of neonate larvae placed a short distance from soybean plants to reach a host was affected by high soil and ambient temperature. The results of these experiments suggest that larval host establishment and spin-down behavior play a major role in the late instar population distribution among soybean fields and that maturity of the host strongly influences that behavior. Résumé L'installation sur soja des chenilles de premier stade d'Heliothis zea Des expériences ont été réalisées dans deux types de conditions (avec ou sans possibilité de dispersion) pour déterminer si le taux d'installation des chenilles de premier stade de H. zea Bod. dépendait d'une mortalité liée au stade développement de Glycine max L. L'installation était considérée comme réussie quand les chenilles avaient atteint le second stade. Bien qu'il fût possible de distinguer les variétés de soja tant par le taux d'installation des chenilles que par les dégâts provoqués, les plantes les plus jeunes étaient plus colonisées par des chenilles que les témoins plus âgés. Toutes les variétés de soja à n'importe quel stade étaient acceptées lorsque la dispersion des chenilles était impossible. Avec possibilité de dispersion, les chenilles ont aussi accepté tous les stades phénologiques, mais en moins grands nombres que lorsque la dispersion était impossible. Le comportement de dispersion était beaucoup plus fréquent sur les plantes à port indéterminé que sur celles à port déterminé. Les possibilités de réinstallation après dispersion des chenilles de premier stade ont été limitées." @default.
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- W2134153943 date "1989-07-01" @default.
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- W2134153943 title "Establishment of early instar Heliothis zea on soybeans" @default.
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- W2134153943 doi "https://doi.org/10.1111/j.1570-7458.1989.tb01234.x" @default.
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