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by danpat
1798 days ago
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It's somewhat complicated - timing of cold weather is important to kill off the beetles: https://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/fo... > For example,
an under-bark temperature of –37°C will
kill 50 per cent of a mountain pine beetle
population, even in mid-winter; however, a
low temperature of –20°C in the fall, be-
fore the beetles are prepared for winter,
or in the spring, when beetles are start-
ing to become more active, will also kill
beetles if it is preceded by temperatures
above 0°C. The relatively warmer temper-
ature causes the larvae to start to lose its
natural antifreeze. |
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