Control of main diseases and insect pests of Ligusticum chuanxiong

1. Main diseases and their control methods

Leaf blight mostly occurs 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.

At the initial stage of the disease, the prevention and treatment methods were sprayed with 65% Dysen zinc solution, or 1000 times solution of 50% acetaminophen, or 100 Bordeaux solution. Once every 10 days, for 3 consecutive times.

Powdery mildew occurred seriously from late June to September 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 severe cases, the stems and leaves turned yellow and withered.

The control method ① cleaned the fields after harvest and burned the diseased leaves of the residual plants; at the initial stage of the onset of ②, 25% trimethoprim was sprayed with 1500 times solution, or 50% topiramine 1000 times solution, once every 10 days, for 3 times in a row.

Rhizome rot occurs in the growing period and harvest, the internal rot of the rhizome is yellowish brown, showing a swimming shape, with a special stench and 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 with larvae into the stem, bite the node plate, harm Lingzi, so that it can not be used for seed, and most of them have no harvest when it is serious.

In the period of bud breeding and bud storage, ① sprayed 80% trichlorfon 1000Mel 1500 times solution; before planting, ② used 40% dimethoate 1000 times solution, soaked Ling seed for 3 hours.

Umbilical donation is found according to the routine control, especially in September-October when the seedling growth is in full bloom.