caa a22 4500 386361312 CHVBK 20180307111916.0 cr unu---uuuuu 161130e198903 xx s 000 0 eng 10.4039/Ent121253-3 doi S0008347X00028674 pii (NATIONALLICENCE)cambridge-10.4039/Ent121253-3 SEASONAL ABUNDANCE OF FOLIAGE-DWELLING INSECT PESTS IN COMMERCIAL FIELDS AND INSECTICIDE-FREE PLOTS OF POTATO IN MANITOBA [Elektronische Daten] Patterns of seasonal abundance of Colorado potato beetle, Leptinotarsa decemlineata (Say), potato flea beetle, Epitrix cucumeris (Harris), potato leafhopper, Empoasca fabae (Harris), and aphids on potato cv. Norland are reported for the 1983-1985 growing seasons in southern Manitoba. Each year, Colorado potato beetles and potato flea beetles underwent one generation on the crop. There were two peaks of leafhopper abundance in 1983 and 1984, but only one was evident in 1985. Aphid populations rose to a single peak in August of each year. In experimental plots in the absence of insecticides, Colorado potato beetles completely defoliated plants in two seasons out of the three. In commercial fields, insecticide sprays applied in July and early August greatly reduced populations of Colorado potato beetles for the rest of the season, and there was no defoliation at harvest. Insecticides had less effect on potato flea beetle populations. Leafhopper and aphid populations were small at the time of spraying. Copyright © Entomological Society of Canada 1989 Senanayake D.G. Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 Holliday N.J. Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 The Canadian Entomologist Cambridge University Press 121/3(1989-03), 253-265 0008-347X 121:3<253 1989 121 TCE https://doi.org/10.4039/Ent121253-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent121253-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Senanayake D.G. Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 NATIONALLICENCE 700 1- Holliday N.J. Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 121/3(1989-03), 253-265 0008-347X 121:3<253 1989 121 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge