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Influence of the leaf curling plum aphid (Brachycaudus helichrysi) on stem diameter, seed yield, and their relationship, in sunflower

Published online by Cambridge University Press:  27 March 2009

J. Lerin  and
I. Badenhausser
J. Lerin
Affiliation:
Institut National de la Recherche Agronomique, Centre de Poitou-Charentes, Laboratoire de Zoologie, 86600 Lusignan, France
I. Badenhausser
Affiliation:
Institut National de la Recherche Agronomique, Centre de Poitou-Charentes, Laboratoire de Zoologie, 86600 Lusignan, France
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Summary

The leaf-curling plum aphid (Brachycaudus helichrysi Kalt.) is one of the main pests of sunflower (Helianthus annuus L.) in Europe. Yield losses were assessed in open field conditions and natural infestations over a 3-year period in Central West France. Plant variability and the choice of the more vigorous plants by aphids in open field conditions were two factors interfering with the experiments. To improve their sensitivity and to correct for biases without expanding the experimental design, an analysis of covariance was the best compromise. Field and cage experiments were conducted between 1985 and 1989 to assess the influence of aphids on the relationship between stem diameter at harvest and seed yield. As an indicator of plant vigour (size and yield), stem diameter at harvest was the best choice, as neither its relationship with seed yield nor its mean value was affected by aphid infestation. It was then used as a covariate to study yield losses. Aphid populations were quantified weekly from the beginning to the end of the infestations according to the leaf-curling symptom and to the number of aphids per plant. Multivariate analyses followed by cluster analysis identified groups of plants displaying similar infestation dynamics. It was found that when aphid populations reached > 100 per plant at the budding stage, yield losses occurred. When populations were < 100 aphids per plant at the budding stage and then decreased, no yield loss was observed. This gives growers ample time to monitor populations and treat crops.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 125 , Issue 2 , October 1995 , pp. 211 - 221
Copyright
Copyright © Cambridge University Press 1995

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