Response of lettuce to Trichoderma treatment

A variety of strains of Trichoderma cultured on a molasses medium were added to a peat/sand potting compost at 1% and 0·1% dry w/w. When lettuce (Lactuca sativa L) seeds were planted in the compost, some strains of the fungus prompted seedling emergence and produced larger plants, while other strains had an inhibitory effect on those processes.