First, manage the cucumbers in May to enter the post-harvest period. During this period, the lower leaves of the cucumbers begin to age, soil and fertilizer consumption is excessive, and the selling price of cucumbers falls. May will enter the high temperature stability period, in early May, when the minimum temperature in the night is higher than 15 °C, immediately after the temperature stabilizes through 15 °C, you can not close the greenhouse, in order to reduce excessive high temperature cucumber excessive consumption of nutrients. After the mid-to-late May period, bamboo and wood structure sheds should be completely removed. Demolition of greenhouse film should be selected after 2-3 days of sunny days, and watering once before exposing, to prevent cucumber wilting due to excessive ventilation. Removed film should be folded and marked. Use water to seal the air. The method is to sprinkle enough water on the surface of the film or submerge the film in water. This method can prolong the preservation time of the film for the next time. This month, it is necessary to add enough fertilizer and water according to the growth of cucumbers. It is better to use compound fertilizer or fertilization. May is also a period of high incidence of diseases and insects, pay attention to medication and air humidity management. 2. The cultivation period of cucumbers grown in greenhouses is relatively long. In the past, techniques such as topping or head replacement were generally used to control the growth of cucumbers. However, it was found through experiments that this method would seriously affect the growth rate and total yield of cucumbers. However, if you do not pick up your heart, the plants are too high, especially when the plants cover the ceiling film, it will affect the normal light transmission of the film, and the mutual shade between the plants will lead to poor ventilation and light transmission in the greenhouse. On the one hand, the quality of cucumber will be affected. On the other hand, it causes disease transmission and is not conducive to the normal growth of cucumbers. Therefore, it is one of the important supporting measures to achieve high-yield, high-efficiency and high-quality cultivation of greenhouse cucumbers. The specific method is to avoid watering the cucumber 7 to 10 days before falling, in order to reduce the water content of the stem tissue, and enhance the toughness of the vine tissue. Before falling, be sure to remove the lower leaves and cucumbers to prevent the leaves and cucumbers that hit the ground from infecting other leaves and cucumbers as pathogens. When selecting the vine, choose sunny weather, and do not perform it before or after watering at 10:00. Otherwise, the stalk tissue has high water content, lacks toughness, and is easily broken or cracked. The action of falling vines should be light, do not pull hard and hard. To follow the direction of the vine, the vine is to fall, and when the vine is coiled, it is necessary to bend the vine with the curvature of the vine, not to bend hard or reversely, and to avoid breaking or twisting the vine. The drop height of guava is generally 0.5 to 1.0 meters. Keep leaves and stems about 15 cm away from the surface of the car, and keep more than 20 functional leaves per plant. After falling, it is necessary to strengthen fertilizer and water management and disease prevention measures. According to its frequent diseases, after the fall of vines, they will then choose the right agent, spray and prevent disease. In the days following the fall of vines, the temperature and humidity in the greenhouse must be properly increased to promote the wound healing of the vine. Third, the disease May cucumber Please pay special attention to downy mildew, bacterial leaf spot disease and leaf spot fly (also known as leaf nematode). Downy mildew: leaf dorsum immersed in water. Control methods: spraying 0.16% urea or 0.2% potassium dihydrogen phosphate + 0.2% sugar water on the foliar; when the disease is severe, high-temperature stuffy shed method can be used; in the early stage of disease, 75% chlorothalonil wettable powder can be sprayed 500 times + thiophanate-methyl 500-fold mixture or 600-fold 64% antivirus WP; mid-morbidity, use DuPont Keluo, Anke + Pinhao Mixture or Xisemalin + Mancozeb Zinc Mixture. product manual. At the late stage of disease, all the diseased leaves will be removed and high-temperature stuffy sheds will be used. Note that the spray agent should be sprayed on both positive and negative sides, and the spray volume should be above 60 kg liquid/mu. Bacterial keratoses: leaf dorsum blister spots. Note that downy mildew is a plaque and has 3-10 square millimeters. Bacterial keratoses are spots with sizes less than 1 square millimeter. Other differences include: 1. When the wet leaves on the back of the lesion on the white bacteria pus, dry after a white film or powder, which is different from the downy mildew layer of downy mildew mold growing on the back; , leaf perforation late leaf lesions, and perforation is not the late peronitis is not different; 3, damage the melon, rot has odor, downy mildew does not endanger melon strips. At the beginning of the disease prevention and treatment, neophytin 5000 times liquid, 30% copper citrate ferric copper (DT fungicide) WP 500 times, 60% DMSO aluminum (DTM) wettable powder 500 times, 77% Can kill WP 400 times, 47% Garethon WP 600-800 times, 12% Copper rosin (green copper) EC 300-400 times, or 70% methemosweet copper wettable powder 600 times the liquid, the above agents can be used interchangeably, spray once every 7 to 10 days, continuous spray 3 to 4 times. Excessive use of copper preparations can cause phytotoxicity, generally not exceeding 3 times. The spray must be carefully sprayed on the front and back of the blade to improve the control effect. Liriomyza sativae: After May, a large number of female adults migrated from small wheat fields and rape fields into the vegetable fields and caused damage. The female adults stabbed the leaves of the plants and fed and spawned. The larvae invaded the leaves and petioles, resulting in irregular snake-like white insects. The chlorophyll was destroyed, affecting photosynthesis, and the heavy-vegetated leaves fell off, resulting in flower buds and fruit. Burns, severely damaged seedlings. In the early days of L. sativae, the insect tracts were irregularly stretched and the worm tracts often became wider. Control methods: Adult fly is trapped to kill adult insects. At the beginning to the end of the adult period, 15 trapping sites per acre are set, and 1 insect trapping paper is placed at each point to trap and kill the adults, and they are replaced once every 3-4 days; When there are 5 larvae in the leaves, the larvae will control the larvae before the 2nd instar (worm worms are very small), and the larvae will start to leaf activities when the dew is dry at 8-11 hours, or the 25% spot will be sprayed when the mature larvae are drilled from the wormholes. Net EC 1500 times, 1.8% EDT, 3000 times, 5% fenvalerate, 2000 times, 25%, 500%, 98%, Monosodium Peptide 800 Diluent, 1% synergism 7051 biological chloranthone 2000 times, 1.5% abamectin 3,000 times, 20% Confodic Concentrate 4000 times, 5% Cyclosafe 2000 times, 36 The percentage of gram-negative larvae is 1000-1500 times, and 5% is stuck in 2000 times. Prevention and control time is good at 8-12 when the adult emergence peaks. In addition, biological control methods can also be used. The parasitoids such as E. japonicus were parasitized on L. sativae with a high control rate.
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