Main diseases and insect pests of Ligusticum chuanxiong and their control methods

1. Main diseases and control methods of Ligusticum chuanxiong

Leaf blight: most of them occur from May to August. During the onset of the disease, brown and irregular spots appeared in the leaves, and then spread to the whole leaves, resulting in the death of the leaves of the whole plant.

Prevention and treatment methods: spray 65% Dysen zinc solution at the initial stage of the disease, or 1000 times solution of 50% acetaminophen, or 100 Bordeaux solution. Once every 10 days, for 3 consecutive times.

Powdery mildew: from late June to September, the disease was serious when the temperature and humidity was high. First, the disease occurred in the lower leaves, the gray white powder appeared on the leaves and stems, and then gradually spread upward. In the later stage, black spots appeared in the disease part, and in serious cases, the stems and leaves turned yellow and withered.

Control methods: after ① harvest, clean up the fields and burn the diseased leaves of the residual plants; at the initial stage of the onset of ②, spray with 1500 times of 25% trimethoprim, or 1000 times of 50% topiramate, once every 10 days, for 3 times.

Rhizome rot disease: occurs in the growing period and harvest, the internal rot of the rhizome is yellowish brown, showing a swimming shape, with a special stench, into a soft rot. After the damage in the growing period, the aboveground leaves gradually turned yellow and fell off.

Prevention and treatment methods: immediately after the occurrence of ①, diseased plants were removed and concentrated burning to prevent spread; ② paid attention to drainage, especially in the rainy season, Rain Water was too much, poor drainage, serious disease; ③ in the harvest and seed selection, to remove the diseased "Rhizoma Ligusticum" and the rotten "Lingzi".

two。 Main insect pests and their control methods

Ligusticum chuanxiong stem node moth: the larva eats into the stem and bites the node plate, endangering Lingzi, so that it can not be used as a seed, and most of them have no harvest when it is serious.

Control methods: ① spray 80% trichlorfon 1500 times solution during bud breeding and bud storage period; before ② planting, use 40% dimethoate 1000 times solution, soak Ling seed for 3 hours.

Umbilical donation: when found, it should be treated according to the routine control, especially in September-October when the seedlings are at their peak.