Author Description

The fungicides anilazine, captan, dichloran, folpet, iprodione, and thiram were tested for efficacy against gray mould, on container-grown seedlings of white spruce, western red-cedar, western hemlock, Sitka spruce, and Douglas-fir. Phytotoxicity of the fungicides to the seedlings was also determined. Beginning the 14th week after germinant emergence, the fungicides were applied bi-weekly for the next 2 months. To ensure that adequate inoculum of the pathogen was present, the seedlings were inoculated with a mixture of 10 isolates of B. cinerea after the first fungicide application, and on alternate weeks thereafter for a total of six inoculations.