THE ODOUR OF COCCIDAE

Extract

I have been much interested in reading the notes upon the odour of scale insects by Professors Webster and Cockerell in the January and February issues of this journal. Durning my inspections in orchards and nurseries I have frequently detected the odour emitte by Aspidiotus perniciosus, mentioned by Webster, especially where the trees were badly infested, and have wondered what relationship it bore to the species. I have detected the most pronounced odours, however, in the genera Chionaspis and Lecanium. The odour produced by the Euonymus scale, Chionaspis euonymi, is very unpleasant to some persons. It is most marked upon badly infested, freshly cut twigs. If they are left in a tightly closed room for a few hours, the air will become very foul.