Published online by Cambridge University Press: 31 May 2012
In the past, fumigation at temperatures much below 60°F. has not been widely advocated to control insect pests in unheated structures. The objections to such a practice have been based on a number of considerations which will be discussed later. The possibility of estending the schedule of treatments to lower temperatures is obviously of great importance in Canada, where the mean monthly temperatures in most parts of the country lie below 60°F. for 8 or 9 months of the year and where there are three or four months when the range is between 40° and 60°F.