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174 P. Harris and M. Maw<br />
Table 45 Open releases and recoveries <strong>of</strong> insects against Hypericum per/oralum L.<br />
Year <strong>of</strong><br />
Release site Year Origin Number Recovery<br />
Chrysolina hyperici<br />
Pictou Co., Nova Scotia 1969 British Columbia 2 100 adults 1970<br />
Prince Edward Co., Ontario 1969 British Columbia 70 adults 1970<br />
Annapolis Co., Nova Scotia 1969 British Columbia 1320 adults 1979<br />
Prince Edward Co., Ontario 1970 British Columbia 182 adults 1970<br />
Tay Creek, New Brunswick 1971 British Columbia 1 150 adults 1972<br />
Lime Kiln, New Brunswick 1971 British Columbia 1 150 adults<br />
Tay Creek, New Brunswick 1975 British Columbia 496 adults<br />
Chrysolina quadrigemina<br />
Prince Edward Co., Ontario 1969 British Columbia 182 adults 1970<br />
Sidney Twp., Ontario 1971 British Columbia 15 adults<br />
1971 California 139 adults<br />
Tay Creek, New Brunswick 1975 British Columbia 128 adUlts} Not found<br />
Tay Creek, New Brunswick 1977 British Columbia 55 adults in 1981<br />
Guelph, Ontario 1979 Ontario 40 adults· 7000 collected<br />
in 1981<br />
4 sites near Guelph, Ontario 1979 Ontario 560 adults No recovery<br />
34 sites in and around<br />
Guelph, Ontario 1981 Ontario 7000 adults<br />
Agrilus hyperici<br />
Elko, British Columbia 1977 California 56 adults No recovery<br />
up to 1981<br />
Aphis chloris<br />
Elko, British Columbia 1979 Germany 300 plus Did not<br />
survive<br />
Elko, British Columbia 1980 Germany 150000 1981<br />
Anailis plagiata<br />
Grandforks, British Columbia1967 Europe 875 larvae 1981<br />
Westbridge, British Columbia 1967 Europe 500 larvae<br />
Tay Creek, New Brunswick 1977 Switzerland 715 adults Not found<br />
in 1978<br />
Elko, British Columbia 1977 Switzerland 3648larvae<br />
Agassiz, British Columbia 1977 Switzerland 476 larvae 1981<br />
Elko, British Columbia 1980 France 169 larvae 1981**<br />
• Sample examined contained 17 C. quadrigemina: 7 C. hyperici<br />
.. In view <strong>of</strong> the small population in 1981, it is assumed that establishment occurred<br />
from the 1980 releases.<br />
pre-aestival feeding on the flowering plants for longer than the males, so that mass<br />
collecting produced a badly distorted sex ratio. It is not known whether other releases<br />
were adversely affected in this manner. The release site at North Tay Creek, New<br />
Brunswick, has been subject to insecticide drift from aerial treatments <strong>of</strong> the forest<br />
against spruce budworm. In 1978, 1979, and 1980, a buffer strip <strong>of</strong> two miles was left<br />
between the treated forest and the release field and beetle density increased noticeably
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