芹菜发生的“烂心”现象,在芹菜整个生育期都可发生,尤其是苗期发生更为严重,轻者导致缺苗减产,重者甚至因此毁种。其主要症状是芹菜外叶深绿,心叶干黄、腐烂。一、发病原因1、缺素芹菜因缺钙而产生的心腐病是导致芹菜烂心死棵的主要原因。芹菜缺钙时,生长点的幼嫩组织初为褐色至深褐色,后变黑枯死,同时病害向下延伸到茎基部和根部,致使茎表面变褐干枯,剖开生长点后可见内部中空,呈褐色干腐状,略有酸味。同时植株的根系变黄褐色至黄棕色,根系数量减少。芹菜对硼比较敏感,当硼吸收不 Celery “” bad heart "phenomenon, celery can occur throughout the reproductive period, especially in the more serious seedling stage, the light led to the lack of seedlings cut, even those who devastated. The main symptom is dark green celery leaves, heart leaves dry yellow, decay. First, the incidence of causes 1, lack of celery heart disease due to calcium deficiency is the main reason leading to dead celery celery. Celery calcium deficiency, the growing point of young tissue initially brown to dark brown, then black dead, and disease extends down to the stem base and roots, resulting in brown stem dry surface, cut open the growth point after the visible hollow, Brown dry rot, slightly sour. At the same time, the root system of plants turned yellow-brown to yellow-brown, reducing the root system. Celery is more sensitive to boron, when the boron absorption is not