Abstract
Alternaria alternate, Choanephora cucurbitarum, Fusarium culmorum, Fusarium proliferatum Fusarium sporotrichioides, were isolated from squash plants showed blossom end rot symptoms,with different isolation frequencies. Pathogenicity test for previous fungi were fulfilled. In laboratory trials, Amcoton was applied to PDA to determine its effect on dry weight of previous fungi, the result showed significant inhibitions on dry weight to C. cucurbitarum and F.culmorum with 16.12% when it was used with 20 mg and 10 mg/ L respectively, while Amcoton application showed activation effect to A.alternata dry weight with activation percent 41.3 % when it was used with 20 mg / L. Amcoton application also caused significant inhibition to fungal mycelium growth the highest inhibition was recorded with C.cucurbitarum 23,54 % ,while Activation effective was observed with A.alternata with 11.2%
