First, the cause of the morbidity of watermelon pour fruit. Watermelon pour fruit (known as frozen prickly heat) symptoms are seeds around the seeds were water stains, purple to dark brown, severe melon seeds around the melon spoilage, can not eat, lost its value. According to the survey, the cause of watermelon pods disease mainly has the following aspects. 1, and rootstock varieties related. According to the comparison of multiple plots, the occurrence of rootstocks with white pumpkin seeds was less, accounting for 5%, while the incidence of rootstocks with loquat seeds was higher, 30% lighter and 90% heavier. Sunrise Office and Boluopu Town have a larger area of ​​rootstocks with gourd gourd, so the fruit of dumplings is serious, while Tangchi Town and Shagangzi Town have more rootstocks with white pumpkin seeds. 2, seedlings nutritional area is insufficient. The rootstocks and scions were sown in one nutrient bowl (10 cm and 10 cm). The crowded seedlings and the night temperatures were too high, causing the seedlings to grow long and the resistance decreased. 3, a single fertilizer. Farmyard manure, which is dominated by chicken manure, often causes high soil alkalinity and affects soil permeability. 4, after transplanting encounter "cold spring". In 2006, Huchanglai, Xihu Village, Boluopu Town, planted 5 acres of greenhouse watermelon on April 8th. After 6 days of planting, it was endangered by cold weather. Shed temperature was only 2.5°C. Seedling roots did not develop, and the leaves were yellow, half a month later. Only to restore growth. Due to the long time of slow seedlings, affecting the normal development of the watermelon, the fruit of the dumplings accounted for 85% of the total number of fruits, investing 90,000 yuan to build a large shed, only to recover 20,000 yuan, and suffered heavy losses. 5, the temperature difference is not enough, the humidity is too large. The high night temperature is not conducive to the assimilation of plants, which is detrimental to the growth of seedlings and fruits. Due to the high humidity in the shed, anthrax, and epidemic diseases are easy to occur. 6, harvest is not timely, strong light cooked melon. When the melon is mature, the organic matter is mainly transformed, not made and accumulated. The light is too strong in the later period. The melon is exposed to strong light and it easily causes sunburn disease and prickly berry fruit. 7, virus disease damage. All the fruit in the dumplings were infected by the virus during the seedling stage and the swelling stage. Second, prevention and control measures 1. Choose disease-free seeds. Including rootstocks and scion seeds have no disease infection, no seeds are introduced from the ward, and dry heat or chemical treatment is required before sowing. 2, with disease-free soil seedlings. Choose fertile soil that is far from the cultivation area of ​​melon crops as nursery soil, and mix it with “vegetable nursery parenting agentâ€, which can both sterilize and strengthen the seedlings. There are 500 bags of nursery mothers with 1 bag, and 1500 nursery pots can be mixed. 3, rotation down. Drainage is the best measure for disease prevention. It can be used for 2-3 years of rotation with non-cucurbit plants such as eggplants, legumes, and green onions. 4. Use white pumpkin seeds as rootstock. 5, tool disinfection. Grafting blades were disinfected with 75% alcohol and each graft was disinfected. In addition, agricultural operations to avoid plant damage to prevent human transmission of viral disease. 6, scientific fertilization. Basal fertilizer should be dominated by bio-organic compound fertilizer, 100 kg per mu, chicken manure to fully decay fermentation, two cars per shed (agricultural tricycle can be), plus 15 kg of compound fertilizer and the amount of boron, calcium, magnesium fertilizer. 7, to prevent late spring. Greenhouse watermelon colonization is generally in early April, at this time the most vulnerable to endangered by the cold, cold materials must be prepared in advance, before the cold flow can also put sterilizing smoke agent fumigation, both prevent disease and cold, ensure that the temperature within the shed is not low At 15°C. 8, humidity management. Watermelon plants are not moisture tolerant on the ground and underground, the air humidity is high, the illumination is insufficient, and the melon flavour is low. Bottom water is used for drip irrigation at the time of planting to prevent drip irrigation. It is better to go under the membrane to reduce the humidity in the greenhouse to prevent the spread of the disease. 9, temperature management. Keep the temperature at 24-30°C and the minimum temperature cannot be lower than 15°C. Watermelon grows well under conditions of high temperature, large temperature difference between day and night, air-drying, sufficient light, good drainage, deep soil layer, and good permeability to water, pH 5-7, in order to obtain high quality and high yield. 10, young melon sun, cooked melon cover. The experience of melon farmers is that the fruits are ripe during the ripening season. The ripe and ripe melons are mainly transformed by organic substances instead of being produced and accumulated. Late light is too strong to cover with leaves to prevent the sun. 11, prevent virus disease. Virus disease is the main cause of pruned fruit. It can occur at the seedling stage and in the early stage of fruit setting. The symptom is that the leaves are small, shrunken, and the leaves are yellow-green, and the leaves are uneven and hardened. In addition to the use of disease-free seeds, rotation and other measures to prevent viral diseases, “Green†pesticides can be used. After being absorbed by plants, the drug can effectively destroy the virus structure, eliminate toxins from the body, and restore normal physiological functions. Two years of practice has proved that this drug is the first choice for solving viral diseases. Multi Enzyme,Feed Additives Enzymes,Feed Enzymes,Nsp Enzyme Tangshan Finely Animal Care Co.,Ltd , https://www.faczyme.com
Etiology and Control Measures of Melon Fruit