The impact of pests and diseases was moderate during early August 2018 in the main rice regions of China. During July to August in 2018, the temperature was mostly higher than average and there were abundant rains  in some parts of southwest China, northeast China, and southern China. They provided appropriate conditions for rice Planthopper and rice Leaf roller migration, and rice Sheath blight dispersal.

Rice planthopper

The distribution of rice planthopper during early August 2018 is shown in Figure 1.1 and Table1.1. The total area affected by the planthopper reached 4.7 million hectares, with the pest occurring severely in northeastern Sichuan, central Jiangsu, and central Hunan, and moderately in western Heilongjiang, southern Henan, easternAnhui, and western Jiangxi.

Figure 1.1 Distribution of rice planthopper in China (early August 2018)

Table1.1 Statistics of rice planthopper in China (early August 2018)

Rice leaf roller

Rice leaf roller (Figure 1.2 and Table1.2) damaged around 3.4 million hectares, with the pest severely occurring in northeastern Sichuan, central Jiangsu, eastern Anhui, central Hunan, and northern Guizhou. Moderate occurrence is estimated for western Heilongjiang, southern Henan, and western Jiangxi.

Figure1.2 Distribution of rice leaf roller in China (early August 2018)

Table1.2 Statistics of rice leaf roller in China (early August 2018)

Rice sheath blight

Rice sheath blight (Figure 1.3 and Table1.3) damaged around 4.9 million hectares, with the disease occurring mainly in eastern Sichuan, central Jiangsu, eastern Anhui, and western Guangxi. Moderate impact vis assumed for western Heilongjiang, eastern Hunan, and western Jiangxi.

Figure1.3 Distribution of rice sheath blight in China (early August 2018)

Table 1.3 Statistics of rice sheath blight in China (early August 2018)

The maize suffered moderately from pest and disease attacks during early August in the main production areas. Heavy rains and high humidity in north China, northeast China, and Huanghuaihai were conducive to armyworm reproduction and sheath blight dispersal.

Maize armyworm

The distribution of maize armyworm in early August 2018 is shown in Figure 1.4 and Table 1.4. The total area affected with armyworms  reached 2.0 million hectares,with the pest mainly occurred in most of Jilin, central Liaoning, central Hebei, most of Henan, and western Shandong.

Figure 1.4 Distribution of maize armyworm in China (early August 2018)

Table 1.4 Statistics of maize armyworm in China (early August 2018)

Maize sheath blight

Maize sheath blight damaged around 1.0 million hectares, with the disease mainly occurring in central Jilin, central Hebei, western Shandong, eastern Henan, and central Shaanxi.

Figure 1.5 Distribution of maize sheath blight in China(early August 2018)

Table 1.5 Statistics of maize sheath blight in China (earlyAugust 2018)