Distribution and damage:
Every sesame production area in the country has occurred. The disease is caused by Corynebacterium graminicola fungus. In addition to harming sesame seeds, it also harms crops such as soybeans and straight beans.
Symptoms/morphological features:
After the seedlings are damaged, the stems and stems are withered; the affected leaves develop spotted brown lesions at the beginning, pale brown spots afterwards, or no large spots, and there are inconspicuous ring veins and brown moldy layers, which are the conidial stems of the pathogen. And conidia; lesions on the stem brown, spindle or bar-shaped, central depression; lesions on the lesions red-brown or purple, slightly concave.
Incidence rule:
The pathogens overwintered on the seeds or diseased plant residues with conidia and mycelia. The mycelium on the seed can survive for more than 2 years, and the conidia on the sick body still have a %% survival rate after one year. Conidia spread by wind and rain, initial infection and repeated infections. The optimum temperature for the growth of the bacteria is 27-30°C. When the plant growth is weak and the humidity in the field is high, the incidence is heavier.
Control methods:
1. Agricultural measures to remove field diseased plant debris, deep back to the land; to avoid low-lying land sesame seeds; the selection of disease-free seeds; strengthen cultivation and management, rational close planting, increased organic fertilizer and phosphorus and potassium fertilizers, Qinggou drainage to reduce the humidity in the field. 2. In the early stage of disease prevention and treatment, use 40% carbendazim gel suspension 700 times, or 25% carbendazim wettable powder 500 times, or 70% mancozeb wettable powder 600 times, or 70% thiol Prophylaxis sprays such as 700 times liquid of buzu WP can be sprayed, preferably sprayed once before flowering period and before capping.
Every sesame production area in the country has occurred. The disease is caused by Corynebacterium graminicola fungus. In addition to harming sesame seeds, it also harms crops such as soybeans and straight beans.
Symptoms/morphological features:
After the seedlings are damaged, the stems and stems are withered; the affected leaves develop spotted brown lesions at the beginning, pale brown spots afterwards, or no large spots, and there are inconspicuous ring veins and brown moldy layers, which are the conidial stems of the pathogen. And conidia; lesions on the stem brown, spindle or bar-shaped, central depression; lesions on the lesions red-brown or purple, slightly concave.
Incidence rule:
The pathogens overwintered on the seeds or diseased plant residues with conidia and mycelia. The mycelium on the seed can survive for more than 2 years, and the conidia on the sick body still have a %% survival rate after one year. Conidia spread by wind and rain, initial infection and repeated infections. The optimum temperature for the growth of the bacteria is 27-30°C. When the plant growth is weak and the humidity in the field is high, the incidence is heavier.
Control methods:
1. Agricultural measures to remove field diseased plant debris, deep back to the land; to avoid low-lying land sesame seeds; the selection of disease-free seeds; strengthen cultivation and management, rational close planting, increased organic fertilizer and phosphorus and potassium fertilizers, Qinggou drainage to reduce the humidity in the field. 2. In the early stage of disease prevention and treatment, use 40% carbendazim gel suspension 700 times, or 25% carbendazim wettable powder 500 times, or 70% mancozeb wettable powder 600 times, or 70% thiol Prophylaxis sprays such as 700 times liquid of buzu WP can be sprayed, preferably sprayed once before flowering period and before capping.
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