caa a22 4500 386361665 CHVBK 20180307111917.0 cr unu---uuuuu 161130e198912 xx s 000 0 eng 10.4039/Ent1211097-12 doi S0008347X00035951 pii (NATIONALLICENCE)cambridge-10.4039/Ent1211097-12 THE SPATIAL DISTRIBUTION OF SPRING AND SUMMER POPULATIONS OF ADULT POTATO FLEA BEETLES, EPITRIX CUCUMERIS (HARRIS) (COLEOPTERA: CHRYSOMELIDAE), ON SMALL PLOTS OF POTATOES [Elektronische Daten] 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. Copyright © Entomological Society of Canada 1989 Stewart Jeff G. Agriculture Canada Research Station, PO Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8 Thompson Leith S. Agriculture Canada Research Station, PO Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8 The Canadian Entomologist Cambridge University Press 121/12(1989-12), 1097-1101 0008-347X 121:12<1097 1989 121 TCE https://doi.org/10.4039/Ent1211097-12 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent1211097-12 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stewart Jeff G. Agriculture Canada Research Station, PO Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8 NATIONALLICENCE 700 1- Thompson Leith S. Agriculture Canada Research Station, PO Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 121/12(1989-12), 1097-1101 0008-347X 121:12<1097 1989 121 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge