Zobrazeno 1 - 10
of 57
pro vyhledávání: '"D. G. Harcourt"'
Autor:
J. C. Guppy, D. G. Harcourt
Publikováno v:
Environmental Entomology. 20:217-223
Since its invasion of eastern Ontario during the late 1960s, damaging outbreaks of the alfalfa weevil, Hypera postica (Gyllenhal), have recurred at frequent intervals. The most recent of these surfaced in 1985, when larval populations in the Bay of Q
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7dd130c947821d13f1ed27ee9f242b2
https://doi.org/10.1093/ee/20.1.217
https://doi.org/10.1093/ee/20.1.217
Publikováno v:
Environmental Entomology. 19:612-617
The seasonal phenology of Zoophthora phytonomi (Arthur) was studied in southern Ontario from 1976 through 1988. The first incidence of disease in the alfalfa weevil, Hypera postica (Gyllenhal), occurred after the accumulation of 204 degree-days (DD)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ca8cf10f7c0e91559aaee5c676df1ea
https://doi.org/10.1093/ee/19.3.612
https://doi.org/10.1093/ee/19.3.612
Autor:
D. G. Harcourt
Publikováno v:
The Canadian Entomologist. 113:601-605
A thermal summation model based on heat units above 9°C accurately predicted peak hatch of eggs, an event critical to management of the alfalfa weevil, Hypera postica (Gyll.), in southern Ontario. The model also gave accurate predictions for maximum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a757171524a0b82fb108242ebb269e49
https://doi.org/10.4039/ent113601-7
https://doi.org/10.4039/ent113601-7
Publikováno v:
The Canadian Entomologist. 106:337-347
As part of a detailed study of the life system of the alfalfa weevil, Hypera postica (Gyll.), in southern Ontario, two methods were developed for estimating numbers of eggs in the spring growth of alfalfa. The first is based on direct counts of the e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eacd6104f544d1a5ac2e754f8157aacd
https://doi.org/10.4039/ent106337-4
https://doi.org/10.4039/ent106337-4
Publikováno v:
The Canadian Entomologist. 107:785-792
This paper presents a sampling plan for estimating numbers of H. postica larvae in the spring growth of alfalfa. A 6-stem bouquet of foliage formed an appropriate sample unit. The pattern of counts for all four instars conformed to the negative binom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2767c8c4d5f9e143bb0f89b9cc1de1e9
https://doi.org/10.4039/ent107785-8
https://doi.org/10.4039/ent107785-8
Publikováno v:
Environmental Entomology. 16:145-153
Following its invasion of eastern Ontario during the mid-1970's, numbers of the alfalfa blotch leafminer, Agromyza frontella (Rondani), increased rapidly to economic proportions and then receded to near tolerable levels. Thirty-three life tables were
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::552003afeacaa7cb19afd439346d12a5
https://doi.org/10.1093/ee/16.1.145
https://doi.org/10.1093/ee/16.1.145
Autor:
D. G. Harcourt, M. A. Latheef
Publikováno v:
Entomologia Experimentalis et Applicata. 17:67-76
As part of an overall study of population regulation in Leptinotarsa decemlineata ecological life tables were developed for a 3-year period on tomato in eastern Ontario. Component and graphical key factor analyses of twelve life tables revealed that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e05a9eac29bf61e42b7ce05627477441
https://doi.org/10.1111/j.1570-7458.1974.tb00319.x
https://doi.org/10.1111/j.1570-7458.1974.tb00319.x
Autor:
M. R. Binns, D. G. Harcourt
Publikováno v:
The Canadian Entomologist. 112:375-385
During 1977, a detailed study was undertaken to develop efficient sampling procedures for estimating egg and larval populations of the alfalfa blotch leafminer, Agromyza frontella (Rond.), in Vernal alfalfa. Distributions of the stages within and bet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83d8b607e650c0c724f55c64e1f31c8b
https://doi.org/10.4039/ent112375-4
https://doi.org/10.4039/ent112375-4
Publikováno v:
The Canadian Entomologist. 109:1521-1534
Fifteen life tables were compiled from population and mortality data collected in the Quinte area of eastern Ontario during the 5-year period, 1972–76, that spanned the rise and fall of an outbreak of the alfalfa weevil, Hypera postica (Gyll.).Comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c7cb74de04d9fc646dcbf05ebae0556
https://doi.org/10.4039/ent1091521-12
https://doi.org/10.4039/ent1091521-12
Autor:
J. C. Guppy, D. G. Harcourt
Publikováno v:
The Canadian Entomologist. 108:551-555
A sequential decision plan, based on the Poisson distribution and providing for two infestation classes, was drawn up as an aid to management of the alfalfa weevil, Hypera postica (Gyll.), on first-growth alfalfa in Ontario. It is based on counts of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ee2454a938d0737469ce959e33b0782
https://doi.org/10.4039/ent108551-5
https://doi.org/10.4039/ent108551-5