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Diaporthe vexans associated with leaf blight and fruit rot disease of brinjal is a serious fungal pathogen causing a significant economic loss in terms of production. Leaf blight and fruit rot disease severity across six agro-ecological zones of Karnataka (India) was studied and the isolation frequency of D. vexans from the six regions was determined. D. vexans isolates were grown on potato dextrose agar medium and identified based on morphological and cultural characteristics. High severity of leaf blight disease was recorded in northern transition zone (NTZ: 10.6−25.3%) followed by central dry zone (CDZ: 10−17%) and southern dry zone (SDZ: 8.3−18%). The maximum severity of fruit rot disease was in CDZ (29−39%) followed by SDZ (22.3−62%) and NTZ (21−33.3%). The frequency of occurrence of D. vexans ranged from 90−100% in all the zones studied and the isolates were all similar in morphology and cultural characteristics. The study concluded that D. vexans is a serious constraint to brinjal production in six brinjal growing regions of southwest India.

Leaf blight and fruit rot disease of brinjal caused by Diaporthe vexans (Phomopsis vexans) in six agro-ecological regions of South West India