Effect of Stenocarpella maydis and Stenocarpella macrospora inoculation timing on Diplodia ear rot of corn

IF 1.7 Q2 PLANT SCIENCES

Plant Health Progress Pub Date : 2024-05-15 DOI:10.1094/php-01-24-0008-rs

Nolan Anderson, Kiersten A. Wise

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引用次数: 0

Abstract

Stenocarpella maydis (Berk.) Sutton and Stenocarpella macrospora (Earle) Sutton are both causal agents of Diplodia ear rot (DER) of corn in the United States, however DER caused by S. macrospora has not been as well studied as S. maydis in trials examining disease development. Field experiments were established from 2019 to 2021 in Kentucky to examine the effect of inoculation timing at one of four growth stages (eight leaf collar (V8), silking (R1), blister (R2), milk (R3)) of each pathogen on DER severity, yield and test weight. Experiments were conducted under dryland and irrigated conditions in 2019 and 2020, and under irrigated conditions in 2021. Treatments inoculated by either pathogen at silking (R1) resulted in higher DER than treatments where inoculation occurred at milk stage (R3) in all years. Yield was reduced in treatments inoculated at R1 compared to the non-inoculated treatment in all trials and years, except the irrigated trial in 2019. A negative relationship was found between DER severity and corn yield and test weight: As DER severity increased, subsequent yield and test weight of corn decreased. This research indicates that an R1 inoculation timing of both Stenocarpella pathogens can negatively impact yield and grain quality.

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Stenocarpella maydis 和 Stenocarpella macrospora 的接种时间对玉米 Diplodia 穗腐病的影响

在美国，Stenocarpella maydis (Berk.) Sutton 和 Stenocarpella macrospora (Earle) Sutton 都是玉米 Diplodia 穗腐病（DER）的病原菌，但在研究病害发展的试验中，对 S. macrospora 引起的 DER 的研究不如对 S. maydis 的研究深入。从 2019 年到 2021 年，在肯塔基州进行了田间试验，以考察每种病原体在四个生长阶段（八叶领（V8）、抽丝（R1）、水泡（R2）、乳熟（R3））之一的接种时间对 DER 严重程度、产量和测试重量的影响。实验于 2019 年和 2020 年在旱地和灌溉条件下进行，2021 年在灌溉条件下进行。在所有年份中，在吐丝期（R1）接种任一种病原体的处理比在挤奶期（R3）接种病原体的处理的 DER 更高。除 2019 年的灌溉试验外，在所有试验和年份中，与未接种处理相比，在 R1 接种处理的产量均有所下降。防除效应严重程度与玉米产量和测试重量之间呈负相关：随着 DER 严重程度的增加，玉米的后续产量和测试重量均有所下降。这项研究表明，两种赤霉病病原体的 R1 接种时间会对产量和谷物质量产生负面影响。

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.