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Effect of resistant maize cultivars on larval dispersal and establishment of Chilo partellus (Lepidoptera: Pyralidae)

  • J. K. O. Ampofo (a1)


Larval dispersal and establishment of Chilo partellus (Swinhoe) was studied on different maize cultivar combinations at the whorl stage. Dispersal was increased 2-fold when the infested cultivar ICZ2-CM (resistant) was surrounded by the more susceptible Inbred A, and decreased when Inbred A plants were surrounded by ICZ2-CM. A negative relationship (r = 0.89) was found between the proportions of larvae establishing on infested plants and those unaccounted for. The influence of a cultivar on increased larval dispersal could be exploited in resistance breeding strategies. The possible role of such an effect in pest management strategies is discussed.

La dispersion larvaire et l'établissement du Chilo partellus a été étudié sur différentes combinaisons de cultivar de mais au stade de verticille. La dispersion était deux fois plus importante quand le cultivar infesté ICZ2-CM (résistant) était entouré par Inbred A, plus susceptible, et elle diminuait quand les plantes Inbred A étaient entourées par ICZ2-CM. Il y'avait un rapport négatif (r 0.89) entre les effectifs des larves s'établisseant sur les plantes infestées et ceux qui ne le faisaient pas. L'influence d'un cultivar sur une dispersion larvaire accrue pourrait être exploitée dans les stratégies de culture en vue d'augmenter la résistance. Le rôle possible d'un tel effet dans les stratégies de contrôle des insectes et discuté.



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Effect of resistant maize cultivars on larval dispersal and establishment of Chilo partellus (Lepidoptera: Pyralidae)

  • J. K. O. Ampofo (a1)


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