Survey and identification of pathogens causing leaf spot disease of arecanut in selected areas of hill zone of Karnataka
DOI:
https://doi.org/10.25081/jpc.2023.v51.i3.8860Abstract
Arecanut (Areca catechu) is an important plantation crop of India belongs to the family Arecaceae. The arecanut production in Malnad and coastal regions is adversely affected by various biotic and abiotic stresses which causes a drastic reduction in yield. Now a days, among the biotic stresses, leaf spot caused by Colletotrichum gloeosporioides, Phyllosticta arecae and Pestalotia arecae are becoming more severe. In order to asses the severity of leaf spot diseases an intensive roving survey was carried out during Kharif, 2022 in arecanut growing three taluks of Shivamogga and three taluks of Chikkamagaluru district in Karnataka. Among the six taluks surveyed highest disease severity (81.50 %) caused by Colletotrichum gloeosporioides was recorded in Adagalale village of Sagara taluk and least disease severity (18.50 %) was recorded in Maloor village of Thirthahalli taluk. Highest disease severity (42.20 %) Phyllosticta arecae was recorded in Surakodu village of Sringeri taluk and no disease was recorded in Hilikunji and Nidagodu villages of Hosanagara taluk. Among the six taluks surveyed for leaf spot caused by Pestalotia arecae, highest disease severity (62.50 %) was recorded in Karekumbri village of Thirthahalli. The leaf spot causing pathogens were identified based on symptoms and conidial morphological features as Colletotrichum gloeosporioides, Phyllosticta arecae and Pestalotia arecae.
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