What to do when the medicinal plant Panax notoginseng gets root-knot nematode disease

Symptoms After the roots of Panax notoginseng are invaded by nematodes, the root cells are stimulated by the nematodes and produce tumor-like galls of varying sizes. Both the main root and lateral roots can become deformed and form galls. The small ones are 1-2 mm, and the large ones can turn the entire root system into a single tumor-like mass. After being infected for a longer time, the plant's branches and leaves turn yellow or fall off.

Pathogen Meloidogyne incognita (Kofoid et White) Chitwood, called the southern root-knot nematode. The pathogenic nematode is sexually dimorphic, and the larvae are slender and worm-like. The adult male is filiform, with a slightly rounded tail end, colorless and transparent, measuring 1.0-1.5 x 0.03-0.04 (mm). The adult female is pear-shaped. Each female nematode can lay 300-800 eggs. The females are mostly embedded in the host tissue, measuring 0.44-1.59 x 0.26-0.81 (mm).

For transmission routes, disease conditions, and control methods, see loofah root-knot nematode disease.