FATAL TEMPERATURE FOR DIASPIS AMYGDALI, TRYON

F. M. Webster
1899 Canadian Entomologist  
The President submitted the annual report of the Council, which r.ecorded with satisfaction the continued success of the branch, alluding to the successful celebration of its twenty-fifth anniversary in November last. Eight meetings had been held during the season and fourteen original papers read. Several of the members had again assisted the Natural History Society in its course of Saturday half-hour lectures to young people. The Treasurer's report showed a substantial balance on hand, and,
more » ... nce on hand, and, on motion, these reports were received and adopted. Mr. Lyman then delivetcd his annual address. making it his vaiedietory, on retiring from the presidencv. He reviewed in an interesting manner the past history of the branch, giving statistics to show the progress made and thanking the members for assistance in carrying on the work. The election of officers was then proceeded with, with the following result : President, Mr. Alber:t F. Winn ; Vice-President, Mr. Dwight Brainerd; Secretary-Treasurer, Mr. Lachlan Gibb (re-elected). The retiring President then vacated the chair, which rvas taken by the new President, who read an interesting paper on "Collecting by Electric Light." After spending a half-hour pleasantly in ihe examination oi thc specimens exhibited by various members and in discussion, a very successful meeting was brought to a close. FATAL TEI\{PERATURE FOR DIASPIS AMYGDALI, TRYON. In the CANADIAN ENTOMOItrOGIST, Vol. XXX., pp. 78-80, the writer of this stated that a tree imported from Japan, and badly infested by this Coccid, had been transplanted to the insectary, but the other of the two trees mentioned was not, at that time, properly accounted for. It was planted outside, with a view of ascertaining the lowest degree of temperature that the Diaspis could withstand and not be destroyed. The lowest temperature reached in the winter of 1897-98 was-9o Fahr., but, notwithstanding this, the species wintered over in sufficient numbers to increase considerably over the previous year. During the winter of 1898-99, just passed, the temperature fell to-2I" Fahr. during a single night and to from-12o to -18o Fahr. for several successive nights, with the result that the Diaspis amygdali appear to have every one succumbed, as not a single living individual can be found on the tree. F. M. WEBSTER.
doi:10.4039/ent31130-6 fatcat:j3pzs6c27vfbnnvcwjhik3ftve