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MONITORING AND CONTROL MEASURES FOR WHEAT YELLOW RUST IN
SURKHANDARYA REGION
Juraev Nurboy Usmon ugli
Trainee Researcher Ministry of Agriculture of the Republic of Uzbekistan
National Center for Knowledge and Innovation in Agriculture
Southern Agricultural Research Institute 06.01.09-Plant Protection
Abstract:
Yellow rust, or stripe rust (Puccinia striiformis f. sp. tritici), poses a serious threat to
wheat production worldwide, particularly in regions with temperate climates and mountainous
microzones. The Surkhandarya region of Uzbekistan, characterized by diverse agro-ecological
zones, has witnessed periodic outbreaks of yellow rust, causing considerable reductions in wheat
yield and grain quality. This article discusses the biological characteristics of yellow rust,
environmental conditions favoring its development, and presents current monitoring practices,
surveillance techniques, and integrated control strategies implemented in the region. It also
emphasizes the importance of resistant cultivars, agronomic management, fungicide application,
and regional coordination as part of a sustainable plant protection approach.
Kеywоrds:
yellow rust, Puccinia striiformis, wheat disease, Surkhandarya, rust monitoring,
fungicides, disease resistance, integrated pest management.
INTRОDUСTIОN
Wheat is one of the most vital cereal crops in Uzbekistan, playing a central role in food security
and rural livelihoods. However, its production is increasingly challenged by biotic stresses,
among which yellow rust is particularly destructive. Caused by the obligate biotrophic fungus
Puccinia striiformis f. sp. tritici, yellow rust infects leaves, stems, and sometimes spikes, leading
to premature leaf senescence, impaired photosynthesis, and reduced grain fill.
Surkhandarya, located in the southern part of Uzbekistan, has a unique climate that varies from
dry lowlands to humid mountainous zones. These varied conditions create favorable
microclimates for rust pathogens, especially during cool and moist periods in spring. In recent
years, field observations and regional agricultural statistics have highlighted recurring infections
and yield losses associated with yellow rust in both rain-fed and irrigated wheat systems.
Effective control of yellow rust depends on timely detection, accurate identification, and
coordinated disease management at the field, district, and national levels. This paper presents the
strategies employed in the Surkhandarya region to monitor, contain, and prevent yellow rust
outbreaks, drawing on the principles of integrated plant disease management.
MАTЕRIАLS АND MЕTHОDS
Yellow rust is known for its ability to spread rapidly over long distances through airborne
urediniospores. In Surkhandarya, the pathogen is typically introduced during early spring from
neighboring areas and establishes in wheat fields with dense canopies and high humidity.
Optimal conditions for infection are temperatures between 10–15°C combined with several hours
of leaf wetness, often caused by dew, rainfall, or irrigation [1].
RЕSULTS АND DISСUSSIОN
The effectiveness of yellow rust management depends in part on a nuanced understanding of
Puccinia striiformis f. sp. tritici at the biological and genetic levels. Unlike many fungal
pathogens, yellow rust exhibits extraordinary genetic plasticity, allowing it to adapt rapidly to
selective pressures, especially those posed by widespread use of resistant cultivars or uniform
https://ijmri.de/index.php/jmsi
volume 4, issue 4, 2025
546
fungicide treatments.
The pathogen is an obligate biotroph, which means it requires living host tissue to complete its
life cycle. It produces urediniospores — its primary means of reproduction and dispersal — in
yellow-orange pustules that appear in long stripes along leaf veins. These spores can travel
hundreds of kilometers on wind currents, making containment within a single field or district
challenging without regional coordination [2].
More concerning is the pathogen’s ability to undergo somatic recombination, leading to the
emergence of new pathotypes. Studies from Central Asia, including southern Uzbekistan, have
identified variants such as the "Warrior" and "PstS10" races, which have overcome resistance
genes that were previously durable. This dynamic behavior underscores the need for ongoing
virulence surveys and molecular monitoring to guide breeding and resistance deployment
strategies.
In the Surkhandarya region, agroclimatic conditions vary dramatically between districts. The
southern foothills and river valleys tend to exhibit cooler, more humid spring seasons — ideal
conditions for rust outbreaks. Conversely, the drier plains experience less frequent infection
unless unusually wet weather coincides with sensitive crop growth stages [3].
Climate change further complicates disease prediction. Increased variability in temperature and
precipitation patterns can create new “windows of susceptibility.” Unseasonal rains during
tillering or heading stages, or prolonged dew formation due to shifting nighttime humidity levels,
can trigger rust epidemics in areas previously considered low-risk.
These microclimatic shifts demand localized monitoring systems. The use of automated weather
stations, disease forecasting models, and agroclimatic zoning maps is beginning to take hold in
Surkhandarya’s research institutions. Integration of such tools with early-warning alerts helps
optimize fungicide timing and reduce unnecessary applications [4].
Farmers’ knowledge, beliefs, and decision-making behaviors play a critical role in the control of
wheat yellow rust. Surveys conducted by the Surkhandarya Agricultural Research Institute
between 2020 and 2022 reveal significant variability in disease recognition, response time, and
treatment practices among smallholder farmers.
СОNСLUSIОN
Yellow rust continues to threaten wheat production in the Surkhandarya region, but integrated
and adaptive management approaches are helping to mitigate its impact. Monitoring systems
based on field observation, laboratory diagnostics, and GIS mapping, combined with the use of
resistant varieties, judicious fungicide use, and farmer cooperation, represent the cornerstone of
effective control. Sustained support for research, training, and technological innovation will be
essential to ensure the resilience of the region’s wheat production in the face of evolving plant
disease challenges.
RЕFЕRЕNСЕS
1.
Chen, X. M. (2020). Pathogens and management of cereal rusts. Annual Review of
Phytopathology, 58, 213–232.
2.
Hovmøller, M. S., Walter, S., & Justesen, A. F. (2010). Escalating threat of wheat rusts.
Science, 329(5990), 369.
3.
FAO. (2021). Integrated Management of Wheat Rusts: A Field Guide for Farmers and
Extension Agents in Central and Western Asia. Rome: Food and Agriculture Organization.
4.
Qosimov, I. & Rakhimova, M. (2019). Yellow rust dynamics in southern Uzbekistan.
Uzbek Journal of Agro-Science, 5(1), 27–33.
