Sorghum red stripe virus disease

1, disease symptoms and the law of occurrence

Sorghum red stripe virus disease is a new disease caused by maize dwarf mosaic virus. Sorghum red stripe virus disease can occur throughout the growth period, and its symptoms vary greatly depending on the species. In the early stage, the heart of the diseased plant showed green dots between the veins, which were discontinuously arranged and showed a typical lobe-like shape, followed by expansion to the whole leaf. The leaves are unevenly colored, and the leaves gradually lose their green, yellow, or reddish color, forming a purplish red, stripe-like spot, and finally turning into red strips. Lesion expansion is limited by thick veins. In the end, the disease became purple and dry. This red disease can also occur on leaf sheaths, stems, and spikes, showing a purple stripe. After the ear was damaged, the head was short, the glume was red, and the small flower was aborted. Serious people can't head and even die early.

The diseased plant height at the seedling stage was 1/3 to 1/2 of that of the strong plant, and the heading could not be started and withered earlier; the diseased plant height from the jointing stage to the booting stage was 1/2 to 4/5 of the healthy plant; disease was found before heading, and the plant height was basically normal. Smaller output loss. The main difference between this disease and some fungal or bacterial striae is the occurrence of stigmatic mosaics on the young leaves; no pathogens are detected by microscopy after sampling and culturing the severely ill sites.

In 1996, the Shenyang Agricultural University and the Liaoning Provincial Academy of Agricultural Research Gao Liang studied more than a dozen of the sorghum varieties of Huludao City, Jinzhou City, Shenyang City, Tieling City, Yingkou City, and other places in Liaoning Province.

1 Sorghum red stripe virus disease generally occurs in the producing areas with an average incidence rate of 10%. The incidence of severe land masses is 80% to 90%, and even causes the destruction of the species.

2 There were significant differences among cultivars of sorghum varieties. Hybrids such as Shenzha 5 and Liaoza 1 with T622A as the female parent were severely affected, while the combinations of Jinza 93, Liaoza 4 and Tieza 10 were less severe.

3 The incidence of flat land was light, and the onset of hillside and roadside land mass was heavy. The growth of robust plants was lighter. The survey results of Chaoyang County Agricultural Center and Chaoyang Agricultural School Production Area are consistent with those of Shenyang Agricultural University. In addition, it was found that the plots next to the village were heavier and irrigated; they were heavy before rain and light after rain; Liaoza 6 was basically inactive and showed high resistance. Applying organic fertilizer or applying multiple bio-organic fertilizer plots is light.

2. Control measures

Liaoning's sorghum red stripe virus disease has spread from Hebei and Shandong Provinces, and has been increasing year by year, and should be given sufficient attention. It is recommended to implement comprehensive agricultural control based on planting disease-resistant varieties (such as Liaoza No.6).

1 Vigorously promote high-resistance hybrid combinations, and select high-resistance parents when breeding varieties.

2 timely early sowing, high yield and disease prevention.

3 Increase organic fertilizers to promote multiple biological organic fertilizers.

4 Remove Tanabe weeds.

5 timely irrigation, strengthen the cultivator weeding, soil conservation.

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