Mulberry Blight

Symptoms also known as blight, is one of the main diseases of the stem. From March to May, before and after mulberry sprouting, oval-shaped to irregular light yellow lesions appeared on the branches 40-50 cm below the ground, and after they became red-brown, the lesions spread around the branches one week later and the branches above the diseased branches withered. From May to June, the junction of diseased and health organizations was slightly sunken, orange-yellow, and shark-skin-like rash on the upper lip. After June and July, the skin of the small rash broke and exposed dark spots. Northeast China, Hebei Province, Shandong Province, Fujian Province, Taiwan, and Xinjiang have occurred.

The pathogen Diaporthe nomurai Hara called the Mulberry shell, belonging to the fungus Ascomycotina. The small rash on the lesion is the pathogenic bacterium, with ascospora shells and conidia. Conidia spheroids, dark brown, size 400-800100-200 (um), with long neck openings, open to the surface through the seat. The conidia unit cells in the device are colorless, 10-151-2 (um) in size, and linear or spindle-shaped. The conidia were surrounded by black capsid shells, spherical to oblate spheroids, measuring 220-300 um in size; sac-stick-like, endogenously 8 spindle-shaped ascospores, of size 10-15.53.5-4.4 (um).

Transmission routes and pathogenic conditions The pathogens grow spores in the autumn with conidiospores and ascaria shells on diseased shoots and invade from wounds or lenticels. Morus alba strains are more disease resistant and Lusang is susceptible to disease. The mulberry fields with deep snow cover and long snow cover are seriously affected. The incidence of low-dry Sang Yi, the second dry mulberry, high incidence of mulberry disease. In summer and autumn, the incidence of excessive leaf picking is high. The mulberry fields that suffered from rainy or partial N fertilization in autumn were seriously affected.

Control methods (1) Disease-resistant areas selected for planting Mulberry mulberry disease-resistant varieties: Cold and high dry type should be used. Summer and autumn silkworm mulberries should not be excessively used. Formula fertilization techniques should be used to promote the use of compost and mulberry trees. fat. In the spring, the diseased branches are cut and burned. (2) Spray 25% sodium pentachlorophenolate, 20% copper sulphate 100 times or Baume 4-5 on the trunk at the end of autumn and winter. Lime sulfur, 43% formalin 20 times. (3) If necessary, spray 50% thiophanate-methyl wettable powder 600-1000 times or 50% benomyl WP 1500 times, 25% benomyl EC 800 times.

Machine Dried Kelp

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