Zobrazeno 1 - 10
of 40
pro vyhledávání: '"J. C. Guppy"'
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:
F. Meloche, J. C. Guppy
Publikováno v:
Environmental Entomology. 19:423-427
Eggs and larvae of the braconid parasite, Dacnusa dryas (Nixon), were encapsulated by third instars of the alfalfa blotch leafminer, Agromyza frontella (Rondani). Capsule formation was followed by death of the parasites and melanization and size redu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf35db10b2e40df7485d76f1972ba343
https://doi.org/10.1093/ee/19.2.423
https://doi.org/10.1093/ee/19.2.423
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
Autor:
J. C. Guppy
Publikováno v:
The Canadian Entomologist. 114:1151-1157
In western Quebec, first flight of overwintered adults of the northern June beetle, Phyllophaga fusca (Froelich), and the common June beetle, P. anxia (Le Conte), occurred in mid-May with the accumulation of about 156 degree-days above 5 °C beginnin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31a885da6dcbfa1d7b43cfd4095211d8
https://doi.org/10.4039/ent1141151-12
https://doi.org/10.4039/ent1141151-12
Autor:
D. Walker, J. C. Guppy
Publikováno v:
Austral Ecology. 1:203-212
Virtually complete tree lists from seventy-eight sites in four regions above 1900 in a.s.l. in Papua New Guinea are analysed numerically and the results compared with classifications already in use. A major floristic break occurs between 2800 m and 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e492800d91642de8871c59f37437b80d
https://doi.org/10.1111/j.1442-9993.1976.tb01109.x
https://doi.org/10.1111/j.1442-9993.1976.tb01109.x
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
Autor:
J. C. Guppy
Publikováno v:
The Canadian Entomologist. 113:593-600
The alfalfa blotch leafminer, Agromyza frontella (Rondani), typically develops through three complete generations a year. It overwinters as a partially developed pupa that completes its development in mid-May. Three distinct adult flight periods occu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07f63f8591c17997b7a867ab893dfdd1
https://doi.org/10.4039/ent113593-7
https://doi.org/10.4039/ent113593-7
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
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