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Abstract
Pyracarbolid has protective as well as eradicant action against tea leaf blister blight. It completely inhibited the germination of basidiospores of Exobasidium vexans Massee on agar containing 4 ppm of the fungicide and on tea leaves treated with 50 ppm. Leaf treatment with 500 ppm of pyracarbolid almost completely controlled the development of sporulating blisters when applied six days after inoculation, while 1000 ppm was effective even nine days after inoculation. In one field trial pyracarbolid gave significantly better control than a 50% cuprous oxide fungicide, when applied at the rate of 0.28 kg/ha, and in two others its effectiveness was not significantly different from that of cuprous oxide. At the level required for effective field control, it was safe to the host plant. In view of its protective-cum-eradicant action, pyracarbolid appears to be an ideal fungicide for blight control, provided its cost is not prohibitory.