What are the symptoms of cucumber vine blight? How to prevent and cure?

Cucumber is one of the common vegetables in life, whether it is raw or cooking is a good choice. In the process of cucumber planting, there are often some diseases and insect pests, such as cucumber vine blight. Once the disease occurs, it will infringe on the commodity of cucumber, what are the symptoms of the disease? How to prevent and cure?

What are the symptoms of cucumber vine blight?

Cucumber stems, leaves and young melons can be killed, stem lesions are oil-immersed, yellowish brown, serious stem nodes become dark brown, rot, easy to break disease spots often crack, reddish brown, vascular bundles do not change color. After the damage to the leaves, most of them developed into triangular Taipan from the edge of the leaves, yellowish brown, easy to break, and dense black spots on the disease spots. Melon strips are damaged, and most of them are immersed in water at the top of the strips, with white stickies.

Cucumber vine blight is a disease caused by fungi, which can infect many kinds of cucurbitaceae plants. The pathogen overwinters in the soil or on seeds or poles. The following spring, it is spread by wind, rain and irrigation water, invading the plant from stomata, water pores or wounds. Seed-borne bacteria cause cotyledon disease. The disease is easy to occur in rainy days and at night, such as continuous cropping, flat bed cultivation, poor drainage, excessive density or insufficient fertilizer.

The pathogen overwintered with conidia or ascomycetes in the soil or attached to seeds, poles, greenhouses and sheds. In the following year, it is transmitted through wind, rain and irrigation water, invading from stomata, water holes or wounds. The bacteria prefer warm and high humid environmental conditions, the temperature is 20-25 ℃, the highest is 35 ℃, the lowest is 5 ℃, and the disease is more serious when the relative humidity is more than 85%.

Second, how to control cucumber vine blight?

1. Chemical control

Commonly used agents: dead plant No. 1 + auxiliary agent No. 1, difenoconazole + thiazolyl zinc bacteriophage or Chunramycin, etc.

Treatment formula: dead plant 1 150 times + adjuvant 1 750 times + benzoconazole 750 times + thiazole zinc 750 times, spray, at the same time, 1 good 5 times solution can be used to smear the stem.

2. Strengthen the management

Implement 2-3 years rotation; apply sufficient base fertilizer, timely topdressing to prevent premature senescence of plants; timely drainage after rain. The protected areas should pay attention to ventilation and dehumidification; thoroughly remove the diseased bodies in the field after harvest, and then turn deeply; high border planting, covering plastic film, watering under plastic film; serious and thorough removal of diseased leaves and vines at the initial stage of the disease; pay attention to scientific ventilation.

3. Fertilization

The formula fertilization technology was adopted and fully mature organic fertilizer was applied. Timely and thoroughly remove the diseased body and burn it or bury it deeply after harvest. Protected cultivation should focus on reducing humidity, implement ridge cultivation, carry out full film mulching and dark irrigation under film, and drip irrigation can be used if conditions permit; reasonable close planting, strengthening ventilation and light transmission, reducing indoor humidity and dripping water, timely removal of diseased leaves during cucumber growth; open field cultivation to avoid flood irrigation, strengthen waterlogging prevention in rainy season, reduce soil water content, and properly control watering after disease.

4. Seed treatment

Before sowing, the seeds were soaked in 55 ℃ warm water for 15 minutes and stirred constantly, then soaked in warm water for 3-4 hours, and then sowed in 40% formalin 100 times solution for 30 minutes.