Compatibility of different fungicides with Trichoderma harzianum rifai strain PBAT-21

Compatibility of fungicides at recommended and half the recommended dosages with Trichoderma harzianum strain PBAT-21, in use as a biocontrol agent, is reported. Five contact fungicides, eight systemic fungicides, three fungicides from strobilurins group and six fungicidal mixtures were tested under in vitro conditions. On the basis of effect on mycelial growth, sporulation and spore germination, mancozeb, mandipropamid+mancozeb, carboxin+thiram, mandipropamid, metalaxyl+mancozeb and cymoxanil+mancozeb at half of the recommended dosages were found to be compatible. Mandipropamid, metalaxyl+mancozeb, cymoxanil+mancozeb at the recommended dosages and azoxystrobin+flutriafol even at half of the recommended dosage were found to be incompatible with Trichoderma harzianum strain PBAT-21.