Pear thrips and its control in British Columbia
Cameron, A.E., Treherne, R.C.
Pear thrips and its control in British Columbia - Ottawa 1918 - Pear Dominion of Canada Department of Agricultural Entomological Branch. Bulletin No. 15 .
Pear thrips and its control in British Columbia - Ottawa 1918 - Pear Dominion of Canada Department of Agricultural Entomological Branch. Bulletin No. 15 .