烂心病在西芹全生育期均可能发病,但苗期发病严重。早期发病,可造成烂种,出苗不齐。幼苗出土后染病,多表现生长点或心叶变褐、坏死、干腐,由心叶向外叶扩展,同时通过根茎向根系扩展,导致根茎向下内部组织变褐坏死。根系生长不正常,病苗停止生长,形成无心苗或丛生新芽,严重时导致病苗坏死,蔬菜品质下降。发病轻者,随幼苗生长在幼株期和成株期继续发展,使部分幼嫩叶柄由下向上坏死变褐,最后腐烂。其发病条件主要是:种植带菌种子发病机遇多,发病率高。大棚内土壤高温,病害也会严重发生。主要预防措施有: Rotten heart disease may occur in the celery full growth period, but the incidence of severe seedling. Early onset, can cause rotten species, emergence of missing. Seedlings emerging after the disease, the performance of the growth point or heart leaf browning, necrosis, dry rotate, from the heart to the outer leaf expansion, while the root system through the roots to expand, resulting in rhizome internal tissue browning necrosis. Root growth is not normal, stop the growth of disease seedlings, the formation of unintended seedlings or clusters of sprouts, resulting in serious disease necrosis, vegetable quality decline. Slight onset, with seedling growth in young plants and adult continue to develop, so that part of the young petioles necrosis from the bottom up brown, and finally decay. The incidence of the main conditions are: planting seed germination opportunities, the high incidence. The greenhouse soil temperature, disease will occur seriously. The main preventive measures are: