Disease Prevention and Control in Arisaema: Common Types and Key Measures to Know

Arisaema diseases is the collective term for the various diseases that occur during the artificial cultivation of Arisaema (jack-in-the-pulpit) when it is infected by pathogenic organisms such as fungi, bacteria and viruses. Arisaema is used medicinally for its tubers. Once infected, the plants may suffer leaf damage and stunted growth in mild cases, or tuber rot in severe cases, directly affecting both the yield and quality of the medicinal material.

Common types seen in production include root rot, soft rot, leaf spot and viral diseases. Root rot and soft rot mainly damage the underground tubers; affected plants often show yellowing and wilting leaves, and the tubers rot with an off-putting odor. Leaf spot mostly forms brown lesions on the leaves, and in severe cases the leaves wither and drop off. Viral diseases often cause mosaic patterns, wrinkling and plant stunting.

Most of these diseases favor hot, humid environments and tend to become epidemic during the rainy season and when water accumulates in the field. In fields under continuous cropping, pathogens accumulate in the soil, and infected seed tubers or wounds caused by underground pests feeding on them can also significantly worsen the incidence of disease.

Prevention and control should be based on agricultural measures: rotate with gramineous (grass-family) crops, select disease-free, vigorous seed tubers, and disinfect the seed tubers before sowing. During the growing period, clear the ditches and drain water to reduce field humidity; when diseased plants are found, pull them out promptly and carry them out of the field, and disinfect the planting holes. For viral diseases, control should also include management of virus-transmitting pests such as aphids. In the early stages of disease, appropriate pesticides may be selected according to the type of disease and applied as a spray or as a root drench; alternate the products used to delay the development of pesticide resistance.