Up to mid-May 2018, the precipitation in northern China, eastern and central Huanghuaihai was higher than during 2017, while the temperature was lower. This resulted in moderate occurrence of wheat yellow rust, sheath blight and aphids; the total affected area reached 15.2 million hectares.

The distribution of wheat yellow rust in 2018 is shown in Figure 1.1and Table 1.1. The total area affected by the yellow rust reached 1 million hectares, with the disease moderately occurring in southern Henan, southern Shaanxi, northern Anhui, and southern Hunan, and slightly in southern Shandong and central Jiangsu.

Figure 1.1 Distribution of wheat yellow rust in China (mid May 2018)

Table 1.1 Statistics of wheat yellow rust in China (mid May 2018)

Wheat sheath blight (Figure 1.2 and Table1.2) damaged around 6.6 million hectares in mid May 2018, with the disease severely occurring in most of Anhui, northern Jiangsu, and western Shandong, and moderately in central Sichuan, central Shaanxi, and southern Hubei. Slight impact was observed in eastern Gansu, southern Hebei, and central Henan.

Figure 1.2 Distribution of wheat sheath blight in China (mid May 2018)

Table 1.2 Statistics of wheat sheath blight in China (mid May 2018)

The total wheat area affected with aphids(Figure 1.3 and Table 1.3) has reached 7.6 million hectares in mid May 2018, with severe impact in northern Jiangsu, northern Anhui, western Shandong, and most of Henan. Eastern Sichuan, and central Shaanxi had moderate infestation and only slight infestation occurred in southern Hebei, eastern Gansu.

Figure 1.3 Distribution of wheat aphids inChina (mid May 2018)

Table 1.3 Statistics of wheat aphids in China (mid May 2018)