Trichoderma pseudokoningii was tested for its compatibility with 11 insecticides, 7 fungicides, 2 herbicides, 1 sticker cum spreader, 4 different inorganic fertilizers in in vitro by poinson food technique. All the pesticides were tested for their compatibility with T. pseudokoningii at two different concentrations ., recommended dose (RD) and half of the RD and four different were tested for inorganic fertilizer and organic sticker cum spreader. | Trichoderma pseudokoningii showed compatibility with certain commonly used inorganic pesticides fertilizers and sticker cum spreaders