Pest and disease for rice in China, South and Southeast Asia

In September 2018, rice pest and disease in China, India, Thailand, Bangladesh, Indonesia, Myanmar, Vietnam, Cambodia, Philippines, Pakistan, Nepal and Laos is generally showing only slight infestation levels. 

Distribution of rice pest and disease

The distribution of rice pest and disease in China, South and Southeast Asia during September 2018 is shown in Figure 1.2 and Figure 1.3. Statistics of rice disease and pest are listed in Table 1.1.

The area affected by rice blast in China accounts for 3% of the total rice areas, with the disease mainly occurred in lower Yangtze region and Northeast China. In India, the disease accounts for 10% of total rice area, mainly in Assam and northeastern regions, eastern regions of Gangetic plain, and eastern coastal region. 6% of rice areas are infested in Thailand, mainly in single cropped rice northeastern region, central double and triple cropped rice lowlands, and northern regions of western and southern hill areas. Affected areas in Bangladesh reach 8%, essentially the Gangeticplain and northwestern regions of Sylhet basin. The affected areas in Indonesia (9% ofcultivated areas) occur mainly in Sumatra and southern regions of Java. In Myanmar the disease affects 5% of rice areas, mainly in northern regions of hills area and northern regions of Delta and southern coast. In Vietnam, the fungus occurs in 4% of rice growing areas, mainly in Southern zone with Mekong Delta and northern zone with Red river Delta. The affected areas in Cambodia are 6% of rice areas, mainly in southern regions of upland areas and central Tonle-Sap plain. In Philippines, the disease affects 8% of rice areas, mainly in Lowlands. In Pakistan the pathogen occurs in 7% of rice areas, mainly in northern Punjab and lower Indusriver basin in south Punjab and Sind. The affected area in Nepal accounts for 5% of rice land, mainly in Central and southeastern regions. In Laos affected areas cover 7% of rice areas mainly in southern regions.

Figure 1.1 Distribution of rice blast for in China, South and Southeast Asia (September2018)

The area affected by rice planthopper in China accounts for 18% of the total rice area, with the pest mainly occurring in lower Yangtze region, northeast China and southwest China.

In India, the pest occurs in 25% of the total rice area, mainly in Assam and northeastern regions, Gangetic plain, the north of eastern coastal region and western Himalayas. In Pakistan the pest occurs in 12% of rice areas, mainly in northern Punjab and lower Indus river basin in south Punjab and Sind. The affected area in Nepal accounts for 15% of rice land, mainly in central and southern regions. Affected areas in Bangladesh reach 22%, essentially the coastal region, Gangetic plain and Sylhet basin.

In Myanmar the insect affects 23% of rice areas, mainly in the central plain, and northern Delta regions and the southern coast.  In Laos, The affected area accounts for 21% of rice land, mainly in southern regions. In Thailand, the insect affects 20% of rice areas, mainly in central double and triple cropped rice lowlands and western regions of the southeastern horticulture area. In Cambodia, the southeastern regions of upland areas and central Tonle-Sap plain are affected, representing 13% of rice areas. In Vietnam infested areas cover 28% of rice areas mainly in the southern zone (including the Mekong Delta), northern zone (including the Red river Delta) and central coastal areas from Thanh Hoa to Khanh Hoa.

The affected areas in Indonesia reach 11% of cultivated areas, mainly in southern regions of Sumatra and Java. In the Philippines, 10% of rice areas suffered from rice plant hopper, mainly in forest area and lowlands. 

Figure 1.2 Distribution of rice planthopper for in China, South andSoutheast Asia (September 2018)

Table 1.1 Statistics of rice disease and pest in China, South and Southeast Asia (September 2018)