It is expected that in 2019, wheat scab and aphids will occur on a large scale nationwide.

Release Date:

2019-04-02

On March 28–29, the National Agricultural Technology Extension Center convened the 2019 National Conference on Trends in Wheat Disease and Pest Outbreaks in Zhumadian City, Henan Province. Technical personnel responsible for monitoring and forecasting from major wheat-producing provinces, autonomous regions, and municipalities, along with plant protection and meteorological experts from research and educational institutions, conducted a comprehensive analysis based on current pest and disease baseline levels, wheat variety distribution, crop development stages, and projected weather trends. The assessment indicates that, overall, the 2019 national incidence of major wheat diseases and pests will be heavier than last year, with Fusarium head blight and aphids expected to occur on a large scale. The total affected area nationwide is projected at 950 million mu, of which 520 million mu will be affected by diseases and 430 million mu by insect pests. I. Main…

On March 28–29, the National Agricultural Technology Extension Center convened the 2019 National Conference on Trends in Wheat Disease and Pest Outbreaks in Zhumadian City, Henan Province. Drawing on current baseline levels of disease and pest infestations, wheat variety distribution and developmental stages, as well as projected weather patterns, technical personnel from major wheat-producing provinces, autonomous regions, and municipalities, together with plant protection and meteorological experts from research and educational institutions, forecast that, overall, the 2019 national incidence of major wheat diseases and pests will be more severe than last year, with Fusarium head blight and aphids expected to occur on a large scale. The total affected area nationwide is projected at 950 million mu‑times, of which 520 million mu‑times will be affected by diseases and 430 million mu‑times by insect pests.

I. Major Diseases

Fusarium head blight has become epidemic in the middle and lower reaches of the Yangtze River, the Jianghuai region, and the southern Huang-Huai wheat-growing areas; it is moderately severe in the northern Huang-Huai region and at moderate levels in other wheat-growing areas. The affected area totals approximately 150 million mu, with about 250 million mu‑times requiring preventive and control measures. The optimal timing for the first chemical application is during the early stage of wheat anthesis: mid‑April in the middle and lower Yangtze River region, mid‑ to late April in the Jianghuai and southern Huang-Huai areas, late April to early May in northern Huang-Huai and southern North China, and late May to early June across most of Northwest China.

Stripe rust has generally been mild overall. Moderate incidence has been observed in wheat-growing areas including the riverine and valley regions of Sichuan, most of Hubei, southern Shaanxi and the western Guanzhong Plain, southern Henan, southern Gansu, and the Ili River Valley in Xinjiang, with some localized fields experiencing moderately severe outbreaks; the affected area totals approximately 25 million mu. The peak epidemic period occurs from early to mid-April in the Southwest and the Han River Basin, from mid-April to mid-May in the Huanghuai region and southern North China, from mid-May to mid-June in the winter wheat areas of Northwest China, and from late June to late July in the spring wheat areas.

Powdery mildew occurred at a moderate level overall, with heavier outbreaks in parts of the Huai River region and northern Jiangsu, along the coastal areas, in central and northern Henan, and in southern Gansu; the affected area totaled 90 million mu. The peak incidence period was mid-April to early May in the Jianghan and Jianghuai wheat-growing regions, late April to mid-May in the Huanghuai wheat-growing region, and throughout May in the North China and Northwest wheat-growing regions.

Overall, sheath blight is occurring at a moderate level, with heavier infestations in parts of the Jianghan, Jianghuai, and Huanghuai wheat-growing regions, and lighter outbreaks in the Northwest and Southwest. The affected area totals 120 million mu. At present, stem infection has already begun in the Jianghan and Jianghuai wheat areas, while the peak incidence in the Huanghuai, North China, and Northwest wheat regions is expected from mid-April to early May.

The geographic range of stem base rot and root rot has expanded, leaf rust is widespread across most wheat-growing regions, and diseases such as take-all, leaf blight, smut, and cyst nematode disease can cause significant damage in certain areas.

II. Major Pests

Aphids have broken out severely in Shandong and Hebei, with moderate to severe outbreaks across most of the Huanghuai region and the central and eastern parts of Northwest China, and moderate infestations in other wheat-growing areas; the total affected area amounts to 220 million mu. The peak period of damage occurs from late April to early May in northern Jianghuai and southern Huanghuai, from mid‑to‑late May in northern Huanghuai and North China, and from late May to mid‑June in the Northwest wheat region.

Overall, the rice leafroller is expected to occur at a mild level; however, moderate outbreaks are anticipated in southern Hebei, with localized high-density infestations possible in areas such as Nanpi in Hebei, Yicheng in Henan, and Xixia. The affected area is projected to reach 15 million mu. The peak emergence of adult moths will occur from mid-April to early May.

Wheat spider mites, the first generation of cotton bollworms, the first generation of armyworms, gray planthoppers, wheat leaf bees, wheat stem sawflies, and locusts can cause significant damage in certain regions.

Source: Pest and Disease Information

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