First Report of Neocosmospora striata Causing Peanut Pod Rot in China
1Biological Control Center of Plant Diseases and Plant Pests of Hebei Province, College of Plant Protection, Agricultural University of Hebei, Baoding, 071000, Hebei, China.
Plant Disease
|February 9, 2019
Summary
A new peanut pod rot disease caused by Neocosmospora striata was identified in China. This finding is crucial for managing peanut crop losses and understanding fungal plant pathogens.
Area of Science:
- Plant Pathology
- Mycology
- Agricultural Science
Background:
- An outbreak of peanut pod rot occurred in China's largest peanut-growing region in 2008, causing significant yield losses.
- Symptoms resembled peanut black rot but lacked characteristic perithecia, necessitating further investigation.
Purpose of the Study:
- To identify the causal agent of the peanut pod rot outbreak in China.
- To fulfill Koch's postulates and confirm the pathogenicity of the isolated fungus.
Main Methods:
- Isolation and culturing of fungal pathogens from symptomatic peanut pods.
- Morphological characterization of fungal isolates, including conidia and ascomata.
- Molecular identification using internal transcribed spacer (ITS) region sequencing.
- Pathogenicity testing by inoculating peanut pods and reisolating the fungus.
Main Results:
- Twenty-three Fusarium-like isolates were obtained, with morphological characteristics matching Neocosmospora striata.
- ITS sequencing showed high identity to Fusarium and Neocosmospora species.
- Koch's postulates confirmed N. striata as the causative agent of peanut pod rot.
Conclusions:
- This study reports Neocosmospora striata as the causal agent of peanut pod rot in China for the first time.
- The findings contribute to understanding peanut diseases and provide a basis for disease management strategies.
- This is the first description of the anamorph of N. striata.
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