In recent years, the physiological diseases of cucumber have been increasing year by year, such as malformed melons, bitter melons, low-temperature physiological diseases, flower tops, and melons. Many vegetable farmers have a headache in the cultivation process, which seriously affects the yield and quality of cucumbers. Therefore, it is very necessary to identify and prevent the physiological diseases of cucumber in time.
One, malformed melon
1. Symptoms and causes: (1) Curved melons, long-fruited varieties tend to form crooked melons, and in severe cases do not have commercial value. Physiological reasons are mostly related to malnutrition and delicate plants, especially when the temperature is high or the temperature difference between day and night is too large, too small, and the light is less; sometimes the water supply is improper, the moisture in the early stage of the squash is normal, and the water supply is insufficient in the later stage, or the worm Hazards can form curved melons. (2) Spiked melon, coarse near the stem, fine at the tip. When the unisexual knot is low in fertility, the spiky-melon is formed when the fertilization is poor, and the unisexual knot-strength cultivar can develop into a normal melon without pollination under good nutritional conditions, otherwise the sharp-mouthed melon will be formed. (3) Waist gourd, the base and top of the stalk are normal, and the contraction in the middle part of the melon strip is caused by the unbalanced supply of nutrients and water, and the uneven accumulation of assimilation material will result in the emergence of a thin waisted melon. (4) The big belly cucumber, the front part of melon strip hypertrophy, and the middle and the base is thin. This is due to inadequate female flower pollination, apical hypertrophy of the pollen, and due to nutritional deficiencies, uneven moisture, and slow growth in the middle and base.
2. Control methods: early detection of malformed melons was removed to reduce nutrient consumption; attention should be paid to the adjustment of temperature and humidity in the shed, and the supply of fertilizer and water should be balanced in a timely manner to avoid physiological drought; spray some plant regulators on the foliage, such as green wind 95, etc. .
Second, bitter melon
1. Symptoms and Causes: Accumulation of bittersin in cucumber results in bitter taste and inability to eat. Excessive nitrogen fertilizer, phosphorus, potassium fertilizer deficiency, especially a one-time application of too much nitrogen fertilizer, prone to bitter melon; cucumber nitrogen, phosphorus, potassium absorption basically follow the ratio of 5:2:6, otherwise there will be unbalanced birth, resulting in Appetite, or the emergence of malaise, prone to bitter melons on the lateral branches; temperature is too high, above 32 °C, reduced capacity for assimilation, excessive loss, malnutrition; soil is too dry; cloudy, low sunlight, low temperature , moisture nutrient absorption is inhibited, easy to form bitter melon; a certain relationship with the species.
2. Control methods: Formula fertilization, so that nitrogen, phosphorus, potassium and a reasonable mix; promote the use of organic farm fertilizer and biogas fertilizer; timely watering, to prevent dry early; control temperature, avoid high temperature, low temperature; choose not easily produce bitter melon varieties.
Third, flower topping and melon
1. Symptoms and etiology: The top of the flower shows that the growing point of the cucumber turns into flowers, and the melon strips stop growing after flowering. In addition, low temperatures and high temperatures prevent fertilization and produce melons. Cause: The disease mostly occurs in the early stages of the results. The shed is hot and dry early, especially when the soil is dry, fertilizer is too much, or Tucheng is wet. Roots are prone to occur, resulting in weakened root absorption capacity. These causes will lead to the emergence of cucumber flowers. Topping or melon.
2. Control methods: timely loose soil, pay attention to water and fertilizer management, properly control the temperature, so that the temperature is appropriate during the day, humidity, the temperature of a control at 25 °C ~ 30 °C, 15 °C at night; close planting; cloudy, low temperature, can be carried out Foliar spray fertilizer; appropriate ventilation, carbon dioxide fertilization, promote the accumulation of assimilation substances, strengthen the management of fertilizer and water and pest control.
Fourth, low temperature physiological disease
1. Symptoms and etiology: In case of low temperature, light leaves yellow-white, if the duration is long, the plants do not show rooting or flower buds do not differentiate, the heavier leaves have water stains, spots, shrinkage, curling, wilting, even withering . The cold tolerance ability of cucumber is weak. The plant will suffer from 0 to 10°C. When the temperature is lowered to 3 to 5°C, the physiological function will cause obstacles, cause injury, cause the cells to dehydrate or cause the cells to rise away and die, and the plants will wilt and die.
2. Control methods: selection of low-temperature resistant varieties; strengthening of insulation measures; seedlings can be covered with plastic film; double grass curtains are placed on the greenhouses; smoke or temporary temperature compensation; conscious exercise at the beginning and low temperature intermittently before the planting; Temperature, about 0.5 to 1 hour each time, can be carried out for 5 to 7 days; also can spray some 500ppm of streptomycin to control the disease.
Application
The Double-lumen Endotracheal tube (also called Double-lumen endobronchial tube or DLT) is a type of endotracheal tube which is used in tracheal intubation during thoracic surgery and other medical conditions, to achieve the selective one sided ventilation of either the right or the left lung.
The main disadvantage of right sided tubes concerns the short length of the right main bronchus before giving off the upper lobe bronchus(risk of occusion)
Thus, left-sided tubes are usually preferred, even for right side surgery.
Features&Benefit
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Ø Package:EO sterilized pouch,1pcs/pack,80pcs/CNT
Ø Accessories:Y-connector,stylet&connectors
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Ø ISO13485,US FDA,CFDA approved
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