Action du puceron Acyrthosiphon pisum (Harris) (Horn., Aphididae) sur les facteurs de production du pois proteagineux de printemps, en phase de floraison
1991
Badenhausser, I. | Bournoville, R. | Cantot, P. | Rivault, E. | Giraud, E.
Effect on pea production of Acyrthosiphon pisum (Harris) (Horn., Aphididae) infestation during flowering period The effect on pea production of aphid populations starting at early stages and stopped at the beginning or at the end of flowering has been studies in proteaginous pea fields with artificial infestations under small cages. Comparisons between frequency distributions of the number of aphids per plant in these conditions and frequency distributions in open field infestations allow us to consider that the risk relative to a mean number of aphids per plant is maximized in our experiments. It is shown that complex mechanisms are involved in the plant response to the action of A. pisum: for example aphids can stimulate production on young nodes. The interaction between plant response and environmental factors is demonstrated. Anyhow, the weight of seeds per plant or their nitrogen content have never been reduced by any of the observed aphid dynamics in our experiments. The natural local dynamics of this aphid allow us to conclude that production losses (if any) would be of no economic significance in our agrometeorological conditions.
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