Prevalence of Stenocarpella maydis and Stenocarpella macrospora causing Diplodia ear rot in Kentucky

IF 1.7 Q2 PLANT SCIENCES

Plant Health Progress Pub Date : 2023-08-18 DOI:10.1094/php-06-23-0060-rs

N. Anderson, K. Wise

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Abstract

Kentucky corn (Zea mays L.) fields were surveyed in 2019 and 2020 for the presence of Diplodia ear rot (DER) to document the prevalence and distribution of the disease and determine frequency of DER causal agents Stenocarpella maydis (Berk.) Sutton and Stenocarpella macrospora (Earle) Sutton. In 2019, 92 fields were surveyed and 125 of 4,600 inspected ears were confirmed to be infected by either causal agent. In 2020, 87 fields were surveyed, and 45 of 4,350 ears examined were confirmed to be infected by either causal agent. Fungi were isolated from corn ears with suspected signs and symptoms of DER, and causal species was identified based on conidia morphology. In 2019, S. macrospora was identified in 33.8% of inspected ears, and 36.9% of ears in 2020, while S. maydis was confirmed in 66.2% of inspected ears in 2019 and 63.1% in 2020. Incidence of DER was higher in fields with a previous crop rotation of double crop wheat/soybean (P = 0.0113); however DER severity was not affected by previous crop rotation (P = 0.3454). Results from this study emphasize the importance of including both Stenocarpella spp. in future research and discussion on DER.

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肯塔基州麦氏窄笛虫和大孢子窄笛虫引起的穗腐病流行

2019年和2020年对肯塔基玉米(Zea mays L.)大田进行了穗腐病(DER)的调查，以记录该疾病的流行和分布，并确定DER病原菌Stenocarpella maydis (Berk)的频率。萨顿和大孢子窄笛霉(Earle)萨顿。2019年，对92个田间进行了调查，4600只被检查的耳朵中有125只被确认感染。2020年，对87个农田进行了调查，在检查的4350只耳朵中，有45只被确认感染了任何一种病原体。从疑似DER体征和症状的玉米穗中分离到真菌，并根据分生孢子形态鉴定致病种。2019年大孢子葡萄球菌检出率为33.8%，2020年检出率为36.9%;2019年大孢子葡萄球菌检出率为66.2%，2020年为63.1%。以前轮作双季小麦/大豆的田区DER发病率较高(P = 0.0113);然而，以前的作物轮作对DER严重程度没有影响(P = 0.3454)。本研究结果强调了在今后的研究和讨论中纳入窄笛藻属的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant Health Progress Agricultural and Biological Sciences-Horticulture

CiteScore

3.00

自引率

13.00%

发文量

期刊介绍： Plant Health Progress, a member journal of the Plant Management Network, is a multidisciplinary science-based journal covering all aspects of applied plant health management in agriculture and horticulture. Both peer-reviewed and fully citable, the journal is a credible online-only publication. Plant Health Progress is a not-for-profit collaborative endeavor of the plant health community at large, serving practitioners worldwide. Its primary goal is to provide a comprehensive one-stop Internet resource for plant health information.