How to control cucumber gum disease by stem vine gum dripping gum dead melon gum dripping soft rot

In cucumber production, especially in greenhouse cultivation, cucumber glue flow is common. Cucumber stem dripping gum, the top gradually withered until death, melon strips after the flow of glue, poor commodity, and even deformity or soft rot. If the production is light, the production will be reduced by 20%, and the production will be reduced by 30%. The heavy ones will have no production, which will seriously affect the efficiency. Glue is the product of photosynthesis in cucumber leaves and is an essential nutrient for cucumber growth. After the disease of the plant, the phloem transport tissue was cut off, resulting in photosynthate overflow and glue flow. In this paper, the diagnosis and control techniques of several common cucumber gum diseases are introduced as follows:

Cucumber gummy disease

1. Diagnosis of symptoms of glue flow disease

1. Cucumber scab

It does serious harm to the young leaves, tender stems, young melons and tendrils near the growing point of cucumber. If the growing point is damaged, it can rot within 3 days in 2Murray, resulting in bald piles. Leaves infected with disease, produce chlorotic near-round disease spot, and then become yellowish brown, after the disease spot dry, will perforate, the edge is star-shaped. Stem vine damage, grow dark green water immersion slightly sunken disease spot, rough epidermis, scab-like, rupture after the flow of glue, wet conditions, the disease part of the fester, can cause part of the stem wilt. Melon strips suffer, start to flow glue, grow dark brown sunken spots, disease spots are scab-like, the formation of deformed melons, diseased melons generally do not rot, when high humidity, the disease spots grow gray-black mold layer. The disease likes low temperature and high humidity and is resistant to weak light. The optimum temperature is 15 ℃-22 ℃. When the air humidity is more than 90%, the roof and cucumber have water droplets.

2. Cucumber blight

Mainly harms leaves, stems and melon strips. Leaf disease, showing dark brown water immersion-like round spots, soft rot when wet, blue-white rupture when dry. Stem damage, showing water-immersed soft rot, constriction, resulting in glue flow, causing wilting. For example, if the cucumber has several nodal diseases, the whole plant will soon dry up. Melon strips are damaged, showing water-stained dark green sunken spots, secreting milky glue, gradually changing to amber, then softening and soft rot, and white mold growing on the surface, giving off a foul smell. The optimum temperature of the disease is 25 ℃-30 ℃. The disease is serious in the open field when it is hot and rainy in summer and autumn and in the plots with high soil moisture in the greenhouse.

3. Vine blight

Harm to stems, leaves and melon strips. The disease occurred in the stem node close to the rhizome, light brown water immersion, tissue softening and glue flow, resulting in cracking, later stem dry, disease spot longitudinal fissures showed hemp-like, serious, the whole plant withered and withered. The leaves were damaged and developed into V-shaped or round brown spots from the edge of the leaves, which were easy to break when dry. Melon strips are susceptible to disease, resulting in yellow chlorotic spots. With the development of the disease, the disease spots are sunken, melon strips are deformed and bent, sometimes spilling amber glue. Vine blight is characterized by uniform black spots on all lesions. The optimum temperature of the pathogen is 18 ℃-25 ℃, and the air humidity is more than 85%. In continuous cropping, the growth of the plant was weak and the disease was serious due to poor drainage.

Second, prevention and control technology

Star black disease: after discovering the diseased plant, pull out, bury or burn it in time, spray 800 times of 70% methyl thiophanate wettable powder or the mixture of 500 times of the mother liquid of the tree protection general and 800 times of the new high fat film; epidemic disease: spray 75% carbendazim wettable powder or 58% carbendazim manganese zinc wettable powder 500 times + new high fat film 800 times, find the central diseased plant, and deal with the diseased leaf and diseased plant in time. Vine blight: spray 10% high or 50% chlorothalonil or 70% methyl topiramate wettable powder 500 times + new high fat film 800 times, cucumber stem disease. Wipe the affected area with 50 times rice soup of any of the above drugs. All kinds of potions are used alternately and sprayed once every 7 days, at least twice in a row.