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Research on Crops

Effect of weather on tan spot and the number of conidia of Pyrenophora tritici-repentis in winter wheat crops 

DOI: 10.31830/2348-7542.2026.ROC-1358    | Article Id: ROC-1358 | Page : 624-632
Citation :- Effect of weather on tan spot and the number of conidia of Pyrenophora tritici-repentis in winter wheat crops. Res. Crop. 27: 624-632
KSENIYA GASIYAN, OKSANA KREMNEVA AND ARTEM PONOMAREV gasiyankkk@mail.ru
Address : Federal State Budgetary Scientific Institution «Federal Research Center of Biological Plant Protection» 350039, 62 Kalinin st., Krasnodar, Russia
Submitted Date : 29-08-2026
Accepted Date : 9-09-2026
Online Published:

Abstract

Weather and climate are key factors influencing the development of fungal plant diseases. The most significant meteorological drivers of pathogen incidence are temperature, relative humidity and the amount of precipitation. These factors influence sporulation, germination of phytopathogen spores and survival during the winter, which is crucial for the development of the disease in the following season. Here we aim to evaluate and compare the influence of weather and varietal characteristics of winter wheat on tan spot (pathogen Pyrenophora tritici-repentis) and the concentration of spores in the air to substantiate elements of the methodology for monitoring and forecasting epiphytoties. The study showed that weather variability makes a greater contribution to both the variability in the number of P. tritici-repentis conidia and the development of the disease than genetic differences between varieties. Moreover, among weather variables, temperature is the prevailing factor. However, the weather factor may vary from year to year. Therefore, the "year" factor is a better choice for the subsequent development of monitoring methods and forecasting models. It reflects the totality of all possible weather factors affecting the plant pathogen in each specific year. The “variety” factor, reflecting varietal susceptibility to the phytopathogen, will be of secondary importance in the proposed methodology. The obtained results will enable the development of a monitoring methodology and a model for predicting the incidence of tan spot in crops.

Keywords

Conidia spore-trapping devices tan spot weather factors winter wheat 

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