Control techniques of diseases and insect pests of Corydalis yanhusuo

Corydalis yanhusuo is a perennial herbal medicinal plant. It is one of the commonly used medicinal materials. In the past two years, the number of drug farmers planting Rhizoma Corydalis has increased, but the yield of many farmers is low because the production technology is not in place. Pest control technology is one of the most important points. Let's take a look!

Rhizoma Corydalis downy mildew

[incidence characteristics] the leaf morbidity of Rhizoma Corydalis downy mildew is 0-17.4%, with an average of 3.5%. The development trend is heavy, so it is necessary to carry out prevention and control immediately, and spray again 7 days after the first spraying, in order to ensure the control effect.

[prevention and control method] ① 72% Kelou 75-100g mixed with water 30ml 40 liter fine spray. ② 58% Metalaxyl Manganese Zinc 100g mixed with water 30ml 40L fine spray. ③ 64% germicidal alum 100g water 30ml 40L fine spray.

Sclerotinia sclerotiorum

[incidence characteristics] Sclerotinia sclerotiorum will cause death and lodging in Rhizoma Corydalis, which usually occurs in the first ten days of April, and the occurrence trend is mild, so it needs to be prevented and treated at the beginning of April.

[control method] ① 50% Pythium 75 grams with 40 liters of water spray. ② 50% hydantoin 75 grams with 40 liters of water spray. ③ 70% methyl topiramate 75 grams with 40 liters of water spray. ④ 30% polypyrimidine 100g with 40 liters of water spray.

Corydalis rust

[disease characteristics] the pathogen is a kind of basidiomycetes in fungi, which is easy to occur when the climate is humid in the middle stage of growth, which is mainly harmful to leaves and stems, yellowish-green disease spots in the initial stage, yellowish brown in the later stage, and a large amount of rust-yellow powder scattered after the uplift of the disease spots on the back of leaves and stems.

[prevention and control methods] ① applied more phosphorus and potassium fertilizer and drained water in time. In the early stage of ②, Baumei 0.2 degree stone-sulfur mixture was sprayed. ③ 65% Dyson zinc wettable powder 500x liquid.

Rhizoma Corydalis

[harm symptom] Corydalis yanhusuo weevil is an important pest that greatly reduces the yield of Rhizoma Corydalis. The main damage symptom is that the larvae first eat on the leaves to form brown linear worms, and then enter the petiole from top to bottom, causing the whole leaf to wither. Fields covered with organic matter such as fence fertilizer or other straw and fields planted for years are more harmful, and the 2nd instar larvae from late February to early April are fields with a leaf damage rate of 35%. Prevention and treatment should be carried out immediately.

[control method] ① 48% Lexben 1000 times solution. ② 52.25% Nongdile 1000 times liquid. ③ 5% Regent 2000 sharp liquid. ④ 20% triazophos 500x solution. The medicine was used no more than 2 times.

Ground tiger

[harmful symptoms] belong to Lepidoptera Noctuidae, mainly small land tiger and yellow land tiger, take the larva as the harm, bite off the rhizome.

[control methods] killing can often be carried out in the rhizosphere of the killed plant or under the nearby topsoil during the day.