pdf, 57.71Mb - Entomological Society of Canada
pdf, 57.71Mb - Entomological Society of Canada
pdf, 57.71Mb - Entomological Society of Canada
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
162 P. Harris<br />
Table 40<br />
Table 41<br />
Open releases and recoveries <strong>of</strong> Hyles euphorbiae (L.) against Euphorbia spp. in <strong>Canada</strong>.<br />
Year <strong>of</strong><br />
Year Euphorbia sp. Location No. and Stage Recovery<br />
1965 Cypress spurge Sidney. Ontario 206 larvae<br />
1966 Leafy spurge Jameson, Saskatchewan 1200 larvae<br />
Wilmer, British Columbia 300 larvae<br />
Miami. Manitoba 195 larvae<br />
14 pupae<br />
Hartney. Manitoba 186 larvae<br />
Cypress spurge Sidney. Ontario 3606 larvae<br />
Jones Falls. Ontario 550 larvae<br />
1967 Leafy spurge Wilmer. British Columbia 1900 larvae<br />
Kamloops, British Columbia 3000 larvae<br />
Moose Jaw Creek. Saskatchewan 979 larvae<br />
Balgonie, Saskatchewan 361 larvae<br />
Nr. Balgonie, Saskatchewan 3000 larvae<br />
Milestone, Saskatchewan 901 larvae<br />
Miami, Manitoba 1100 larvae<br />
Picton, Ontario 825 larvae<br />
1967 Cypress spurge Braeside, Ontario 13680 larvae 1968<br />
1968 Cypress spurge Sidney, Ontario 1565 larvae<br />
Braeside, Ontario 2801 larvae<br />
1969 Cypress spurge Braeside, Ontario 5210 larvae<br />
1973 Cypress spurge Hornings Mills, Ontario 600 larvae 1982<br />
1973 Leafy spurge Guelph, Ontario 200 larvae no recovery<br />
1974 Leafy spurge Regina Beach, Saskatchewan 37 larvae<br />
600 pupae<br />
1978 Leafy spurge Cardston, Alberta 229 larvae<br />
ants, mice, carabids, wasps, pentatomids, and spiders (Harris & Alex 1971). At three<br />
sites in Ontario the percentage survival <strong>of</strong> larvae after four days decreased almost<br />
directly with the average number <strong>of</strong> ants caught in a standard series <strong>of</strong> pitfall traps<br />
during the period (Table 41).<br />
The 68 larvae found in 1968 and the 179 found in 1979 that had not been released that<br />
summer were expressed on a m l basis as if all the larvae were confined to a hectare. In<br />
most <strong>of</strong> the subsequent years the survey was restricted to 100 m l samples taken in early<br />
August at paced intervals from a hectare within the release field but in 1975 the samples<br />
were taken from the adjacent roadside which usually supported a higher density <strong>of</strong><br />
larvae.<br />
Relationship between the number <strong>of</strong> ants in pitfall traps and the survival <strong>of</strong> H. euphorbiae<br />
(L.) larvae in a four day period<br />
Place<br />
Braeside<br />
Sidney<br />
Picton<br />
No. ants/trap<br />
5.4<br />
35.9<br />
58.7<br />
% H. euphorbiae<br />
larvae recovered<br />
34.5<br />
20.5<br />
11.8
Change language