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Impact of the groundnut leafminer, Aproaerema modicella (Deventer) (Lepidoptera: Gelechiidae) on growth and yield of two groundnut cultivars
Published online by Cambridge University Press: 07 April 2017
Abstract
The impact of larval defoliation by Aproaerema modicella (Deventer) on the growth, development and yield of two groundnut cultivars (Kadiri 3 and NC Ac 17090) was studied under a naturally occurring, high density infestation. Defoliation by leaf-mining larvae did not increase plant mortality in either cultivar. In both cultivars, leaf and stem production were significantly lower in untreated plots than in the treated plots. Unsprayed plants of both cultivars produced fewer flowers, pegs, and pods per plant compared to plants of the same cultivar protected with monocrotophos. Fruit growth rates, however, were marginally higher in control plots than in treated plots. Pod yields were 35 and 44% lower, and haulm yields 25 and 20% lower, in Kadiri 3 and NC Ac 17090, respectively in untreated control plots compared to plots treated with insecticide. A linear relationship between leafminer density and pod and haulm yields was observed, and differences between cultivars were not significant.
Résumé
Cette étude a porté sur l'impact de la défoliation par les larves de Aproaerema modicella (Deventer) sur la croissance, le développement et le rendement de deux cultivars d'arachide (Kadiri 3 et NC Ac 17090) dans des conditions d'infestation naturelle à densité élevée. La défoliation n'a augmenté la mortalité de plantes ni chez l'un ou l'autre de ces cultivars. Pour les deux cultivars, la production de feuilles et de tiges était sensiblement réduite dans des parcelles non-traitées par rapport aux parcelles traitées. Des plantes non-pulvérisées des deux cultivars ont produit moins de fleurs, de gynophores et de gousses par plante, par rapport aux plantes du même cultivar traitées au monocrotophos. Cependant, les taux de croissance des fruits étaient légèrement plus élevés dans des parcelles témoins que dans des parcelles traitées. Les rendements en gousses étaient de 35 et 44% moins élevés, les rendements en fanes, de 25 et 20% moins élevés, chez Kadiri 3 et NC Ac 17090 respectivement dans des parcelles témoins non-traitées par rapport au traitement insecticide. Un rapport linéaire a été constaté entre la densité d'infestation de la mineuse des feuilles et les rendements en gousses et en fanes, les différences entre cultivars n'étant pas significatives.
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- Copyright © ICIPE 1995
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