Anhui Agricultural Science Bulletin >
2025 , Vol. 31 >Issue 14: 80 - 83
DOI: https://doi.org/10.16377/j.cnki.issn1007-7731.2025.14.017
Epidemiology and integrated control measures of tobacco black shank
Received date: 2024-12-13
Online published: 2025-07-31
Tobacco black shank is one of the major diseases in tobacco production. It has become increasingly severe due to factors such as continuous cropping and frequent introduction of new varieties, threatening the yield and quality of flue-cured tobacco. The etiological characteristics, disease symptoms, pathogenic factors, and control measures of this disease were elaborated. The pathogen of this disease belongs to the genus Phytophthora, with mycelium or chlamydospores serving as the primary infection sources. Its zoospores can directly penetrate the epidermis to infect plants. The optimal temperature for mycelial growth is 28–32 °C, and the optimal temperature for sporangium production is 24–28 °C. This disease can occur throughout the entire growth period of tobacco, with high incidence from the rosette stage to the vigorous growth stage. It mainly damages the basal stems and roots. In the seedling stage, it manifests as “damping-off”; in the field stage, it presents typical symptoms such as “mantle-like”, “bamboo shoot node-like”, and “disc-like” lesions. Pathogenic factors include overwintering of pathogens (surviving for 2–3 years, with continuous cropping exacerbating accumulation), high temperature and high humidity climates (field humidity above 80% for 3–5 consecutive days leading to disease peaks), and root-knot nematode infection (aggravating the damage). Control measures include breeding disease-resistant varieties (such as highly resistant varieties such as Zhongyan 100 and Yuyan No.2, and moderately resistant varieties such as K326 and Yunyan 85); agricultural control (rational crop rotation/intercropping with non-host crops, deep plowing and sunning, high-ridging and earthing up, drainage and humidity reduction, etc.); biological control (using antagonistic microorganisms such as Bacillus and Pseudomonas, as well as plant-derived fungicides from garlic and corktree bark); and chemical control (agents such as metalaxyl-mancozeb, mefenoxam-mancozeb, and dimethomorph). Future research should further explore its pathogenic mechanisms, accelerate the improvement of disease-resistant varieties, develop environmentally friendly biological agents, and optimize integrated prevention and control systems to adapt to different production needs.
Key words: tobacco black shank; symptom; occurrence regularity; integated management
FU Yao , GENG Huaiting , JI Jin , SUN Haochen , FU Hua'anchen . Epidemiology and integrated control measures of tobacco black shank[J]. Anhui Agricultural Science Bulletin, 2025 , 31(14) : 80 -83 . DOI: 10.16377/j.cnki.issn1007-7731.2025.14.017
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