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First Report of Tan Spot on Wheat in Pakistan
S Ali1, L J Francl1, S Iram2
1Department of Plant Pathology, North Dakota State University, Fargo 58105.
Plant Disease
|March 3, 2019
Summary
Tan spot, a significant wheat disease, was identified for the first time in Pakistan. New fungal isolates revealed novel race structures, posing a potential threat to regional wheat production.
Area of Science:
- Plant Pathology
- Mycology
- Agricultural Science
Background:
- Tan spot, caused by Pyrenophora tritici-repentis, is a major wheat foliar disease globally.
- The pathogen induces necrosis and chlorosis symptoms, with isolates classified into five races based on these reactions.
- Wheat cultivation in Pakistan faces potential threats from emerging plant diseases.
Purpose of the Study:
- To survey and identify the presence of tan spot disease in Pakistan's wheat-growing regions.
- To isolate, identify, and characterize the fungal pathogen responsible for tan spot.
- To determine the race structure of Pyrenophora tritici-repentis isolates from Pakistan.
Main Methods:
- Field surveys were conducted in Punjab Province, Pakistan, collecting diseased wheat leaf samples.
- Fungal isolation involved culturing leaf pieces on dampened filter paper and subsequent transfer to V8 potato dextrose agar.
- Pathogenicity and race structure of seven single-spore isolates were assessed using wheat differentials in controlled growth chamber experiments.
Main Results:
- Tan spot was confirmed at 13 locations in Punjab Province, Pakistan.
- The anamorph, Drechslera tritici-repentis, was identified from all collected samples.
- Four of seven isolates belonged to race 1 (nec+chl+); three isolates exhibited novel race characteristics, inducing both necrosis and chlorosis on the 'Katepwa' differential.
Conclusions:
- This study reports the first occurrence of tan spot disease in Pakistan.
- The identified isolates, including novel races, represent a potential threat to wheat production in the region.
- Further research is needed to understand the implications of these new races and develop management strategies.
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