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THE SPATIAL DISTRIBUTION OF SPRING AND SUMMER POPULATIONS OF ADULT POTATO FLEA BEETLES, EPITRIX CUCUMERIS (HARRIS) (COLEOPTERA: CHRYSOMELIDAE), ON SMALL PLOTS OF POTATOES

  • Jeff G. Stewart (a1) and Leith S. Thompson (a1)

Abstract

The spatial distribution of spring and summer populations of the potato flea beetle, Epitrix cucumeris (Harris) (Coleoptera: Chrysomelidae), on potatoes (“Superior” variety) was studied in 1987 and 1988. Slopes of the regression of mean crowding on the mean number of adults per plant were not significantly different from 1.0 except for summer populations in 1988. The y-intercepts of these regression equations were not significantly different from 0, suggesting that adults of the potato flea beetle are not aggregated. The ratios of mean crowding to mean number of adults per plant were 0.81 for spring populations and 1.02 for summer populations, also indicating that the populations were not highly aggregated. With a level of precision of 0.25, 10 samples per plot were appropriate when more than 2.8 adults per plant were present in the spring and when more than 7.2 adults per plant were present in the summer.

En 1987 et 1988, on a étudié la distribution spatiale de populations printanières et estivales de l’altise de la pomme de terre, Epitrix cucumeris (Harris) (Coléoptères : Chrysomélidés), sur la variété [Superior]. Les pentes de régression de la densité moyenne sur le nombre moyen d’adultes par plant ne diffèrent pas significativement de 1,0, sauf pour les populations estivales en 1988. Les abcisses à l’origine de ces équations de régression ne diffèrent pas significativement de 0, ce qui donne à penser que les altises adultes de la pomme de terre ne sont pas groupées. Les rapports de la densité moyenne au nombre moyen d’adultes par plant sont de 0,81 pour les populations printanières et de 1,02 pour les populations estivales, ce qui prouve également que les populations ne sont pas fortement groupées. Avec un seuil de précision de 0,25, il suffit de 10 échantillons par parcelle lorsqu’on retrouve plus de 2,8 adultes par plant au printemps et plus de 7,2 adultes par plant en été.

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References

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