APSnet featured image - Charcoal rot on cantaloupe

APSnet featured image

(A) Early stage of symptom. Water soaked lesion at the base of the crown caused by Macrophomina phaseolina. (B) Advanced stage. Water soaking progresses and older parts of lesions become necrotic.

Claudia Nischwitz (1), Dr. Mary Olsen (2)
(1) University of Idaho, Department of Forest Resources, nisc5708@uidaho.edu;
(2) University of Arizona, Division of Plant Pathology, molsen@ag.arizona.edu.

Host: Cucumis melo, Cantaloupe
Disease name: Charcoal rot
Pathogen name: Macrophomina phaseolina

Many important crop plants are hosts for Macrophomina phaseolina in tropical and subtropical regions. Charcoal rot of melon has become an increasing problem in the last few years in Arizona after more and more growers switched from flood irrigation to sub-surface drip irrigation. Higher inoculum densities found in fields with sub-surface drip irrigation compared to flood-irrigation have suggested that sub-surface drip irrigation may contribute to higher incidences of charcoal rot in melon in Arizona. There is currently no effective control strategy for charcoal rot on melon.

APS publication number: IW000037

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