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Factors affecting the development of Septoria leaf spotof tomato | SUMAN KUMAR | Indian Phytopathology

Factors affecting the development of Septoria leaf spotof tomato

S.K. SUGHA and SUMAN KUMAR

Abstract


The roles of inoculum load, host extracts, leachates, dew and leaf wetness were determined on the development of Septoria leaf spot (Septoria lycopersici) of tomato in Himachal Pradesh, India. An increase in inoculum accelerated the progress of disease development. An inoculum load of 525-1050 spores/ml and leaf wetness in the range of 48-60 h were optimum for the normal development of disease under artificial inoculation tests. Inoculum in extract and leachate of various host parts and dew accelerated development of the disease. Leaf extract and leachate were stimulatory and extracts of unripe fruits were inhibitory to disease development.


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