Occurrence of Leaf Spot Caused by Alternaria alternata on Eggplant (Solanum melongena) in Pakistan

Plant Disease
Muhammad Subhan ShafiqueAhsan Abdullah

Abstract

Eggplant (Solanum melongena L.) is a popular vegetable that is grown in both tropical and subtropical regions all year long. The crop is cultivated on small family farms and is a good source of income for resource-limited farmers in Pakistan. In early May 2019, leaf spots on eggplant (cv. Bemisaal) were observed in an experimental field (31°26'14.0"N 73°04'23.4"E) at the University of Agriculture, Faisalabad, Pakistan. Early symptoms were small, circular, brown, necrotic spots uniformly distributed on leaves. The spots gradually enlarged and coalesced into large, nearly circular or irregularly shaped spots that could be up to 3 cm in length. The center of the spots was light tan, surrounded by a dark brown ring, a chlorotic halo, and tended to split in the later developmental stages. Disease incidence was approximately 35% in the infected field. The causal agent of this disease was isolated consistently by plating surface sterilized (1% NaOCl) sections of symptomatic leaf tissue onto potato dextrose agar (PDA). After 6 days incubation at 25°C with a 12-h photoperiod, fungal colonies had round margins and the cottony mycelia were dark olivaceous with a mean diameter of 7.5 cm. For conidial production, the fungus was grown on pot...Continue Reading

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