In vivo evaluation of Trichoderma spp. for Survival and their Population in Rhizosphere Soil of French Bean

摘要

The initial populations of Trichoderma spp. in black, red and laterite soils were 5.2, 3.6 and 4.8 X103 cfu/g of soil. The soil from rhizosphere of French bean was collected and the population of Trichoderma was assessed by dilution plating techniqueusing TSM. The population was estimated at 15, 30 and 45 days after sowing. At 15th day the population of Trichoderma isolates were maximum in P+ Z5TH8(Trichoderma harzianum)+Z7TW5(Trichoderma viridae) + Z'QTVS'0{Trichoderma virens) treatment (26 x103cfu/g of soil) which was followed by P+ Z5TH8 treatment (23.33 x10~3 cfu / g of soil) and Z5TH8 (23.0 x10~3 cfu/g of soil) treatment. Lowest population was observed in natural soil (9.67 x10~3 cfu / g of soil). The populations of Trichoderma isolates differed significantly from the control.