In vivo efficacy assay: Early ripening tomatoes (Lycopersicon escalentum Mill. cv. Tho) obtained from local grower. Fruits were surface sterilized by immersed in a 0.5 % sodium hypochlorite solution for 15 min, washed three times with sterile distilled water and, allow to air dry. A uniform 5 mm width and 3 mm depth wound was made at the equator of each fruit using a sterile cork borer. Wounded fruits were left in a laminar flow cabinet till the wounds were well dry. An aliquot 50 μl of 104 CFU/ml spores suspension of B. cinerea was injected into each wound. Thirty minutes later, 50 μl of 0 (as control) or 108 CFU/ml cell suspensions of the test bacteria was separately inoculated in each wound. Six fruits of the same treatment were arranged in a plastic box, and tightly enclosed before subjected to incubate at 20 ºC for 5 days in a moisten chamber. The diameter of each decay lesion was measured in two cross direction. The in vivo biocontrol efficacy of each yeast isolate was calculated in percentage of inhibition according to following equation: