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Research Article Open access CC BY 4.0

Survey, Symptomatology, and Isolation of Anthracnose of Cucumber Caused by Colletotrichum orbiculare in the North Karnataka, India

Vani C B., Palaiah, P., Manjunath, N., Mallikarjun Kenganal, Govindappa, M. R

Journal of Advances in Biology & Biotechnology · pp. 124–133 · Published 3 Feb 2026

10.9734/jabb/2026/v29i23621

Abstract

Anthracnose is a destructive disease affecting cucurbits, causing significant losses. The disease can reduce yield by up to 30% in cucumbers and up to 60% in watermelons. A survey conducted in various districts of Karnataka revealed that the highest disease severity was recorded in the Chitradurga District (15.45%), while the lowest was in the Raichur District (3.47%). Colletotrichum orbiculare, the pathogen that causes this disease, produces sparse white mycelia with honey-colored pigmentation on their underside. It also produces small aseptate and obtuse conidia, as well as hyaline and septate mycelia.

Survey Colletotrichum orbiculare symptoms isolation disease severity

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