High risk of wheat stripe rust outbreak needs to be wary of large-scale epidemic

Recently, there has been continuous rainfall in northern Xinjiang, and wheat stripe rust has occurred in the Ili River Valley, Tacheng, Aksu and other places, and it has seen early, strong, and rapid spread. The occurrence is heavier than the previous years, and the area is larger than the same period of the previous year. . According to statistics, as of May 11, the cumulative area of ​​wheat stripe rust was 396,700 mu, compared with 0.004 million mu in the same period of 2015. Combined with the current pre-judgment of wheat growth period and the following weather conditions, wheat stripe rust is re-emerged in northern Xinjiang. All localities need to pay close attention to the dynamics of the field, timely release information on pests and diseases, and guide farmers to prevent and control.

First, the onset is early, spread quickly

At present, wheat stripe rust has occurred in 3 districts (states) and 11 counties (cities) in our district. The occurrence period is 12-55 days earlier than the previous year, and the disease development speed is fast. Yining City, Yining County, Chabucha County has been in a state of proliferation.

Wheat stripe rust occurrence table

Land (state)

County (city)

First sight

2015

First sight

Area of ​​occurrence

(10,000 mu)

Occurrence state (1: sporadic occurrence; 2: spotting occurs; 3: diffusion prevalence;)

Yili

Yining County

April 20

May 6th

5

3

Yili

Yining City

April 22

June 4th

1.95

3

Yili

Chabuchar County

April 27

May 15

5.6

3

Yili

Gongliu County

April 25

May 15

4.3

2

Yili

Xinyuan County

April 22

May 14

12

2

Yili

Huocheng County

April 29

May 22

1

2

Yili

Nilek County

May 11

June 18

9.04

2

Tacheng

Tower city

May 10

June 18

0.008

2

Tacheng

Wusu City

May 11

Yet to happen

0.03

2

Aksu

Wensu County

April 7

Yet to happen

0.657

2

Aksu

Aksu City

April 5th

May 29

0.072

1

Cumulative area

39.657

Second, the amount of bacteria in the field is large

In April, the temperature in Xinjiang was high, the precipitation was too high, and the humidity in the field was large, which was conducive to the occurrence of stripe rust. Especially at the end of April, the heavy rainfall in northern Xinjiang was very favorable to the wheat stripe rust epidemic, and the amount of bacteria in the field was large. At present, the average diseased leaf rate of 9% in Yining County is 3%, and the incidence of 60% of the average diseased leaf rate in the Aiwenon Village of Bayitohai Township is 15%, and the severity is 20%; the disease field of Chabuchaer County The rate is 19%, the average diseased leaf rate is 5.1%, and the severity is 8.5%. The average disease leaf rate of some plots in Aisinli Town and Sunzhazi Town has reached 15%, and the severity is 46%. The serious plot of Yining City The diseased leaf rate is 65%, and the diseased plant rate is 7.5%; Xinyuan County has an average diseased leaf rate of 1% and a severity of 5%. Among them, the area where wheat stripe rust is the earliest in the Turgen farm, the diseased leaf rate is up to 65%, and the severity is Up to 85%; the average ward rate in Gongliu County is 24.1%, the average diseased leaf rate is 0.14%; the diseased leaf rate in Wensu County is 9.25%, and the average severity is 24.84%.

Third, future trends and recommendations

At present, the incidence of wheat stripe rust in our district is constantly expanding, the amount of bacteria in the field is high, and the development speed is fast. The continuous rainfall weather is conducive to the occurrence of diseases. It is not suitable for chemical control on less sunny days, and the control effect is not good. . According to the forecast of the Central Meteorological Observatory, the precipitation in Xinjiang in May-June is more than 1-5%. In the next 10 days, there will be more precipitation in northern Xinjiang. The cumulative precipitation in some areas is 10-20 mm, and the local area is 40-60 mm, which is more obvious than normal. More than one. The high-humidity climatic conditions are very suitable for the epidemic of stripe rust, and the risk of stripe rust in northern Xinjiang is significantly increased. It is expected that the stripe rust in the middle and late stages of wheat will occur in the northern Xinjiang, and the risk of local large is high.

All localities need to be vigilant, pay close attention to the dynamics of the field, adhere to the regular reporting system for major pests and diseases, timely and timely release information on pests and diseases, actively carry out publicity and training of wheat stripe rust prevention and control technology, and guide farmers to scientifically carry out prevention and control. Intensify the promotion and implementation of the unified defense, the wheat stripe rust re-emergence area and the risk zone should seize the opportunity of prevention and control, and carry out prevention, prevention and control work as soon as possible. Triazolone-based agents can be used for prevention. Alcohol, propiconazole and other fungicides.


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