First Report of Diaporthe gulyae Causing Phomopsis Stem Canker of Sunflower (Helianthus annuus) in Argentina

Document Type

Article

Publication Date

5-2019

Abstract

Between 2014 and 2017, elongated, brown lesions were observed on the stem and heads of sunflower (Helianthus annuus L.) plants in the Argentine Southern Sunflower Region (ASSR). A total of 66 diseased plants (40 stems and 26 heads) were sampled from the three production fields: Balcarce (37°52′36.6″S; 58°15′29.4″W; 19 samples), Orense (38°41′36.3″S; 59°47′01.9″W; 36 samples), and Pieres (38°23′31.2″S; 58°40′22.8″W; 11 samples). Fungal isolations were made from the lesion margins of the stem and head by cutting, surface disinfesting, and plating tissue pieces on potato dextrose agar (PDA) amended with 0.02% lactic acid (pH 4.5). The PDA plates were incubated at 25°C for 7 to 10 days under a 12-h photoperiod, and hyphal tips of white to gray colonies were transferred to fresh PDA plates.

Publication Title

Plant Disease

Volume

103

Issue

7

First Page

1769

DOI of Published Version

10.1094/PDIS-10-18-1907-PDN

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