The Latest Technical Methods and Tutorial for the Prevention and Control of Pests and Diseases in Corydalis yanhusuo
Corydalis yanhusuo is a perennial herbaceous medicinal plant, with its tubers used as medicine, and it is one of the commonly used medicinal materials. In the past two years, the number of herb growers planting Corydalis yanhusuo has increased, but many farmers have low yields due to inadequate production techniques, and pest and disease prevention and control technology is the most important one among them. Let's take a look together below!
Corydalis yanhusuo downy mildew
[Disease characteristics] The leaf disease rate of Corydalis yanhusuo downy mildew is 0-17.4%, with an average of 3.5%. The development trend is moderately severe, and prevention and control must be carried out immediately, with another spraying 7 days after the first spraying to ensure control efficacy.
[Control methods] 1. 72% Kelu 75-100 grams mixed with 30-40 liters of water for fine spraying. 2. 58% metalaxyl · mancozeb 100 grams mixed with 30-40 liters of water for fine spraying. 3. 64% Sandofan 100 grams mixed with 30-40 liters of water for fine spraying.
Corydalis yanhusuo sclerotinia rot
[Disease characteristics] Corydalis yanhusuo sclerotinia rot causes large patches of Corydalis yanhusuo to wither, die, and lodge. It usually first appears in early April, and the occurrence trend is mild to moderate, requiring one control treatment in early April.
[Control methods] 1. 50% procymidone 75 grams mixed with 40 liters of water for spraying. 2. 50% iprodione 75 grams mixed with 40 liters of water for spraying. 3. 70% thiophanate-methyl 75 grams mixed with 40 liters of water for spraying. 4. 30% pyrimethanil 100 grams mixed with 40 liters of water for spraying.
Corydalis yanhusuo rust
[Disease characteristics] The pathogen is a type of basidiomycete fungus, which is prone to occur when the climate is humid during the middle growth stage. It mainly damages leaves and stems. In the early stage, the lesions are yellow-green, and in the later stage they turn yellow-brown. After the lesions on the back of the leaves and on the stems bulge and rupture, large amounts of rust-yellow powder are released.
[Control methods] 1. Increase the application of phosphorus and potassium fertilizers and drain water in a timely manner. 2. Spray 0.2 degrees Baume lime sulfur mixture at the early stage of the disease. 3. 65% zineb wettable powder 500 times solution.
Corydalis yanhusuo weevil
[Damage symptoms] The Corydalis yanhusuo weevil is an important pest that causes severe yield reduction in Corydalis yanhusuo. The main damage symptom is that the larvae first bore and feed on the leaves to form brown linear tunnels, then enter the petiole and bore and feed from top to bottom, causing the entire leaf to wilt and turn greenish-dry. Fields covered with barn manure or other organic matter such as straw, and fields planted continuously for years, suffer heavier damage. From late February to early April, for fields where 1st-2nd instar larvae damage leaves with a damage rate of 3-5%, control must be carried out immediately.
[Control methods] 1. 48% chlorpyrifos 1000 times solution. 2. 52.25% Nongdile 1000 times solution. 3. 5% fipronil 2000 times solution. 4. 20% triazophos 500 times solution. Do not apply more than 2 times.
[Damage symptoms] They belong to the order Lepidoptera, family Noctuidae, mainly including the black cutworm and the yellow cutworm. The larvae cause damage by biting through the root-stem area.
[Control methods] During the day, they can often be caught and killed at the root zone of damaged plants or in the surface soil nearby.