NOVELTY - Trichoderma harzianum strain SQR-T037 is preserved in General Microorganism Centre of China Culture Collection Management Committee with a preservation number of CGMCC No.3308. The Trichoderma harzianum strain has an optimum growth temperature of 30 degrees C on potato dextrose agar (PDA) culture medium for a culture period of 96 hours. The Trichoderma harzianum strain SQR-T037 colony has a longest diameter of 90 mm and is spread all over the plate, and produces yellow coloring matter in the culture medium.    USE - Trichoderma harzianum strain SQR-T037 for biological prevention of blight of continuously cropped cucumber and watermelon (claimed).    ADVANTAGE - The Trichoderma harzianum strain SQR-T037 propagates quickly in the soil and ensures a remarkable biological preventive effect of cucumber and watermelon blight by 80-85%.    DETAILED DESCRIPTION - Trichoderma harzianum strain SQR-T037 is preserved in General Microorganism Centre of China Culture Collection Management Committee with a preservation number of CGMCC No.3308. The Trichoderma harzianum strain has an optimum growth temperature of 30 degrees C on potato dextrose agar (PDA) culture medium for a culture period of 96 hours. The Trichoderma harzianum strain SQR-T037 colony has a longest diameter of 90 mm and is spread all over the plate, and produces yellow coloring matter in the culture medium. The conidiophores are bottle-shaped and are opposite to one another. The conidia are elliptic with smooth surface, and are 2.3-3.5 micron long and 2.0-3.2 microns wide. The spores are yellow green, which gradually change into dark green. An INDEPENDENT CLAIM is included for a method for producing microbial organic fertilizer, which involves:    (A) inoculating the strain SQR-T037 into PDA culture solution for liquid fermentation production under a condition, where the initial pH value is 6.5-7.2, the culture temperature is 25-30 degrees C, the volume ratio of the dissolved oxygen to ventilatory capacity is 30-100%, the rotating speed is 170 revolutions per minute (rpm), and the fermentation time is 48 hours;    (B) crushing the mycelium pellets into a colony forming unit for the strain having a content of 1x 108 per ml in the fermentation solution;    (C) inoculating the SQR-T037 fermentation solution with 50 l per ton into decomposed livestock, poultry manure compost and vegetable dreg microbial enzymolysis mixture for solid fermentation at 30-50 degrees C;    (D) fermenting the mixture for 5-6 days to obtain the solid microbial inoculum of the biological preventing strain SQR-T037, where the content of the colony forming unit for the strain is 1x 108 g;    (E) uniformly mixing 50-80 vol.% of SQR-T037 solid microbial inoculum of the livestock and poultry manure compost with 20-50% by volume of SQR-T037 solid microbial inoculum of the vegetable dreg microbial enzymolysis mixture;    (F) evaporating the microbial organic fertilizer at a temperature of 50 degrees C; and    (G) packing microbial organic fertilizer.