Fumigation of strawberry beds with methyl bromide can give better control—99% and higher—of the cyclamen mite than any other method, however, the treatment costs approximately $150.00 an acre. At the maximum, two applications are needed per year, and with perfected techniques a single fumigation probably will suffice. However, fumigation must be carried out carefully to obtain maximum control and must be done precisely to avoid damage to the plants because the dosage that will give good control is rather close to that which will give plant injury and the proper dosage varies with the temperature surrounding the plants. At any one dosage better control is obtained at higher temperatures, but at the same time there is an increase in the amount of injury.

The above progress report is based on Research Project No. 1119.