What are the main reasons for cucumber flow? What are the prevention methods?

February 17, 2021

After the cucumber stalks flow, the top gradually wilted until it dies; after the melon strips flow, the commerciality is poor, and even the malformation or soft rot has no edible value, and the light yield is reduced by 20% to 30%. Seriously affect the economic benefits of the farmers. The author believes that the "glue" of cucumber is the photosynthetic product of cucumber leaves, which is an essential nutrient for cucumber growth. After the plant is infected, the phloem tissue is cut off, causing the photosynthetic product to overflow and produce flow glue. Therefore, it is necessary to distinguish the reasons, the right medicine, there is no need to talk about the color change. Don't be fooled by fake experts.

Now I will summarize the diagnosis and causes of several common cucumber gum diseases: there are many reasons for causing cucumber melon gum, which is most common with blight, sclerotinia and scab; in addition, bacterial diseases, Physiological diseases and improper use of anthraquinones can also cause melon gum to occur.

Cucumber melon strip glue seriously affects the commercial value of cucumber. Vegetable farmers are not sure what causes it. Sometimes the effect after using the medicine is not good. This is because there are many reasons for the melon strip. Recent practice and actual investigations have led to the following conclusions:

Cucumber flow gum diseases are mainly divided into three categories: bacterial disease infection, fungal disease infection, physiological diseases and improper operation, etc., respectively:

First, bacterial disease infection

Bacterial diseases infest the melon strips, usually the bacteria pus appears, and then the melon strips appear water rotten and stink. Although it is inconsistent with the symptoms of gums, in order to make the vegetable farmers more clear about the cucumber gum disease, the author also explained the bacterial diseases infecting the melons.

Bacterial ulcer disease and edge blight of cucumber are the main bacterial diseases that often cause pus.

Symptoms: white psoriasis pus on the melon strips, not easy to drool, the wound is not obvious at the pus, the difference from the gel is not easy to coagulate, the color is generally white, and can cause the melon to rot and become stinky. Necrotic decay was found inside the longitudinal section of the melon.

Control method: Foliar spray bacterial agent, you can choose copper rosinate, quinoline copper, neutrophin, chlorobromoisocyanuric acid, Chunlei·Wang copper, etc., while preventing the plant from appearing wounds, otherwise it is easy to infect bacterial Disease; reduce the indoor air humidity in the shed. It is possible to spread the rice husks in the corridors and planting rows in a cloudy day, and to reduce the humidity while increasing the carbon dioxide content in the air, which is also helpful for increasing the yield.

Second, fungal disease infection

1, gray mold, sclerotinia

Symptoms: Most of the gelatinous parts of gray mold and sclerotinia disease are in the lower part of the flower, that is, the top of the melon strip. The beginning of the flow of glue is mostly white millet granules, around the top of the melon, a white mold on the rubber granules, and finally become a rat fecal sclerotium, causing the melon strip to rot

Control methods: foliar spray pyrimethanil, procymidone, carbendazim · carbendazim, boscalid, Jianda (fluazellamide and pyraclostrobin), Safford (37% azoxystrobin Cycloamine +25% flavonoid nitrile), bactericidal (pyridine oxazole) and other agents for control, can also be mixed in the cucumber anthers mixed with procymidone, iprodione, boscalid, etc., but different bacteria Urea should not be used on fruit-type mini-cucumbers to avoid the occurrence of molting. In addition to the above-mentioned spray control, it can also be combined with medicinal smoke to prevent gray mold and sclerotinia.

2, black star disease

Symptoms: The bleeding of black star disease occurs on the melon body. The glue on the surface of the scab is reddish brown, and the lesions in the gel are dark brown and easy to crack. Black spot disease can infect leaves into small brown spots, and cause leaf perforation or edge of young leaves to rot. The diseased leaves are bald piles. The best way to remember black star disease is that the leaves will have stars after the occurrence of black star disease. Broken. Combined with these characteristics, it is possible to judge whether the small grainy brown spots on the melon strips and the different types of gelatin are different.

Control method: The prevention and treatment of scab can be sprayed with triazoles such as difenoconazole, myclobutanil and flusilazole, but the concentration and number of uses should be controlled. If necessary, promote vegetative growth to prevent drug growth. Caused the "flower topping" problem. For example, myclobutanil + chlorothalonil + alizarin (or other cytokinins) co-foliar spray, the effect is good. When treating black spot disease at the same time, the addition of bacterial drugs and boron-calcium foliar fertilizer to the drug is particularly special and rapid.

3, anthracnose, blight

Symptoms: It will cause brown spots on the melon strips, round or oval, accompanied by reddish-brown glue. The lesion sag is very typical. The lesions on the leaves are also much larger than the black spot disease. Most of them are rotted from the edge. The blight has a v-shaped lesion, which is different from the scab.

Control methods: anthracnose, blight, bromine nitrile and prochloraz, Fumei bis and other compounding agents for prevention and treatment.

4, leaf spot disease (target spot disease, brown spot disease)

In recent years, the target spot disease of cucumber and the brown spot disease are serious, and it can also infect the melon strip to cause flow glue.

Symptoms: On the melon strip, there is a brown gum with a high sorghum size. Sometimes the gelatin is spread throughout the melon strip, and the leaf leaf disease will appear.

Control method: can choose the formula: difenoconazole + methyl thiophanate + zhongshengmycin; myclobutanil + chlorothalonil + copper rosinate or can kill three thousand (46.1% copper hydroxide water dispersion particles Agent) + Baitai (5% pyraclostrobin + 55% Daisenlian) + iprodione, or Luna Sen (21.4% fluopyram + 21.4% sputum) + net fruit essence ( 33.5% quinoline copper) was sprayed on the surface.

Third, physiological diseases

The melon stripe glue caused by physiological diseases generally has small cracks on the surface of the melon strips, and then there is a flow of glue, which is generally white. In fact, the liquid inside the melon strips flows out to form a gel. Sometimes these tiny cracks are not easily found. The main reasons are:

1. Watering is dry and wet. The melon strip is close to the picking period, the growth speed of the melon skin is slow, and watering in the case of long-term drought will cause cracks in the epidermis of the melon strip and flow. Therefore, in order to avoid damage, reasonable watering frequency and field water holding capacity should be guaranteed.

2. Poor ventilation. Sudden ventilation, or a plethora of wind in the shed, will cause the melon skin to molt and flow. Reasonable ventilation is not only an important management condition for avoiding the occurrence of molting in the epidermis of melon strips, but also a necessary condition for the normal growth of cucumber.

3. Improper use of hormones. For example, the concentration of anthers is too large or a large amount of hormone fertilizer is applied, which promotes the rapid growth of melon strips in a short time, resulting in cracks in the epidermis and gelation. Or the concentration of guarin (clopidogrel, also known as pyridone) in the cloudy days, the concentration is not suitable, etc. will stimulate the melon to produce colloid. "Zeng Gu Ling" and other ingredients containing the growth regulator clopidogrel (also known as pyridoxine), when used in large amounts or high concentrations, will cause fine cracks on some melon strips, flow gum, fruit cucumber Especially serious. This kind of flow glue should belong to the range of phytotoxicity, and the cucumber varieties have different reactions to chlorpyrifos (pyridoxine). For cucumbers, this medicine should be used without caution, with caution or with reduced standard concentrations.

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