10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 1 2015 (January - March) Mango ( lessThan i greaterThan Mangifera indica lessThan /i greaterThan L.) is susceptible to a number of diseases. One of the important diseases is leaf spot caused by lessThan i greaterThan Alternaria alternata lessThan /i greaterThan affecting all the plant parts. The pathogen also attacks mango inflorescence resulting in a significant decrease in fruit set. The cultural characters of the pathogen were studied on Potato Dextrose Agar including the role of temperature and pH on the growth and sporulation. Certain fungicide and bioagents were evaluated for the control of the fungus. The temperature 25 lessThan sup greaterThan 0 lessThan /sup greaterThan C and pH 7.0 was found optimum for the growth and sporulation of lessThan i greaterThan Alternaria alternata. lessThan /i greaterThan The fungicide Indofil M-45 was highly effective in inhibiting the mycelial growth at all concentrations followed by Ridomil at 0.5%. The bio agents lessThan i greaterThan Trichoderma harzianum lessThan /i greaterThan reduced the growth of lessThan i greaterThan Alternaria alternata lessThan /i greaterThan by 85.4% followed by lessThan i greaterThan T. viride, T. pseudokoningii, T. koningii , Aspergillus niger lessThan /i greaterThan and lessThan i greaterThan A. flavus lessThan /i greaterThan SHOWKAT AHMAD ZARGER, GAZALA RIZVI AND ROOPAM PARASHAR Mango leaf spot, pH, Temperature, Chemical control, Biological control, Alternaria alternata. 769-776