Panax notoginseng leaf rot blight is more serious, how to prevent and control notoginseng leaf rot b

Panax notoginseng is a Chinese herbal medicine with high medicinal value, in recent years, due to the reduction of raw medicinal resources, many people have developed artificial planting of Panax notoginseng, so do you know how to identify the disease of Panax notoginseng? If you don't know, let's take a look at the symptoms and prevention methods of Panax notoginseng disease.

1. How to prevent and control the notoginseng epidemic? **Symptoms and prevention methods of Panax notoginseng blight.

1. Harmful symptoms.

The onset is the leaves, petioles, and stems. At the beginning of the disease, it produces water-stained dark green lesions without obvious edges, expanding, shrinking, browning, softening and rotting, or the leaves are blue-brown to black-brown, withered and drooping. When damp, a little gray-white mold layer can grow.

2. Pathogenesis.

The pathogen overwinters in the soil with hyphae and oospores, and when the conditions are suitable in the following year, it directly infects the roots with mycelium or forms large sporangia and zoospores and spreads to the ground to cause disease. Wind and rain and human farming practices are the main ways in which the disease spreads. This disease often occurs in the rainy season, and it is easy to induce this disease in early spring and rainy in early spring or low temperature and rain in late autumn.

Poor ventilation and light transmission of ginseng beds, soil compaction, and excessive plant density are conducive to the occurrence and spread of this disease.

2. How to prevent and control the notoginseng epidemic?

Use 100-125 grams of mu 2 sprays of 58% manganese-zinc methalene wettable powder (low toxicity) Use 150-188 grams of mu spray % enoyl methalen water dispersible granules (low toxicity) Use 67-100 grams of mu spray g of downy mildew (low toxicity) Use 60-100 ml of mu sprayUse 23-35 grams of mu spray % enoylmorpholine wettable powder (low toxicity) Use 33-73 grams of mu spray % nail cream chlorothalonil wettable powder (low toxicity) Use 100-120 grams of mu spray % frost urea - manganese zinc wettable powder (low toxicity) Use 125-167 grams of mu spray % fine nail cream - manganese zinc water dispersible granules (low toxicity) Use 100-120 grams of mu spray g L azoxystrobin suspension (low toxicity) Use 48-90 ml mu spray.

It is necessary to choose the right variety for planting, and when planting, we must pay attention to the condition of the soil, we must treat the soil, fertilize it on time, manage it in a scientific way, pay attention to light, and pay attention to the use of pesticides.

Timely spraying of pesticides, you need to choose the right variety for **, you must pay attention to the condition of the soil, pay attention to the watering, pay attention to the fertilization, need to check on time, clean up the dead plants.

Spray Bordeaux liquid or 50% carbendazim 1000 times solution before the onset of the disease, then cut off the part of the ground after fruit picking, clean the ground, spray the ground with 1 Baumé stone sulfur mixture, and disinfect it.

The disease is also known as "leaf rot", the disease begins in 4 May, the disease is serious in 7 and 8 months, after the damage, the leaf or petiole appears dark green irregular lesions, and then the disease spots are deepened, the diseased part becomes sleepy and soft, the leaves are like the boiling water scalded, translucent, and then dry or droop and stick to the base of the stem.

Prevention and control methods. First, after picking the fruit, cut off the above-ground parts, clean the field, and spray the furrow surface with 1 2 Baumé stone sulfur mixture for disinfection. The second is to spray 1 1 200 Bordeaux solution or 50% carbendazim 1000 times solution before the onset of Wang nuclear noise, once every 7 days, 2 3 times in a row.