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In response to the current heavy rainfall, fruit trees have been partially affected by pests and serious diseases. The author suggests the following management measures:
First, this year's abundant rain has contributed to better growth of mountain fruit trees compared to last year. According to surveys, chestnuts and walnuts in Feixian County are growing well. Therefore, it is essential to take advantage of this favorable opportunity to carry out effective summer management. Proper pruning of the canopy should be performed, and fertilization should be strengthened, especially the use of organic fertilizer and phosphorus and potassium fertilizer to ensure healthy tree growth.
Second, with more rain this summer, fruit tree diseases have become more severe than in previous years. This year, pests such as aphids, pear psylla, apple leaf curlers, and scale insects have appeared heavily. Diseases like apple rot, leaf blight, canker, brown spot, anthracnose, ring disease, grape black rot, downy mildew, peach leaf spot, gum disease, walnut anthracnose, and walnut rot have also become more serious. It is crucial to focus on preventing and treating diseases caused by high temperature and humidity. Combining pest control, the following treatments are recommended: 70% methyl thiophanate-soluble powder diluted 800 times, 25% tebuconazole suspension diluted 1500 times, 10% diphenyl ether carbenazole water-dispersible granules diluted 4000 times, 25% flusilazole emulsifiable concentrate diluted 8000 times, and 20% chlorpyrifos diluted 1200 times. When spraying, add a silicone penetrant and alternate the agents to improve effectiveness.
Third, for orchards that have suffered damage, timely rescue measures should be taken after the rain.
1. For orchards that have been flooded, leaves should be washed after the water recedes. Fruit trees that have been submerged should have their branches and leaves cleaned using floodwater to reduce mud. Once all the water has drained, fallen trees should be straightened, soil removed, and roots re-established. Then, any remaining stains on the leaves should be rinsed with clean water to allow normal physiological activities.
2. Timely drainage is essential. Clearing drainage ditches in affected orchards will help drain water and restore dry soil conditions, preventing root damage from standing water. Stone fruit trees like peaches, cherries, and plums are particularly sensitive to waterlogging, so special attention should be given to drainage.
3. Soil loosening is necessary to protect the root system and promote new root growth. Due to heavy rains and flash floods, soil erosion may occur, exposing roots. After the disaster, roots should be corrected and protected, and new roots encouraged. In flatland orchards, shallow tilling after draining water can restore soil permeability and support new root development.
4. Orchards with excessive grass due to rain should actively manage weeds. Using a lawn mower to cut grass every 15–20 days, keeping the grass below 50 cm, and removing strong weeds can prevent competition for nutrients. A non-woven cover test conducted by Shandong Province's fruit innovation team significantly reduced weed growth, improving fruit quality. Grassing between rows and cutting grass 3–4 times a year increases soil organic matter and enhances drought and mite resistance.
5. Foliar sprays should be used to provide additional nutrition and promote growth. Organic-based foliar fertilizers like polypeptide protein solution are recommended. Depending on the condition of the trees, apply 2–3 times. For trees with active flower bud differentiation, adding phosphorus and potassium during topdressing can enhance fruit quality.
6. Pruning should be done rationally. Cut off dry branches at the base and thin out trees with many fallen leaves to promote new shoots and reduce the tree's load. For summer shoots in peaches, apples, and pears, pinching the tips, twisting slightly, and removing dense branches can open up light paths, promoting flower bud differentiation and fruit development.
7. Timely harvesting is important. Harvest fruits that have reached maturity to minimize losses. During the expansion phase, apply phosphorus and potassium fertilizers to improve fruit quality and avoid using ripening agents prematurely.
8. Heavy rainfall affects young fruit trees both positively and negatively. For sandy loam soil, proper drainage and timely fertilization benefit seedling growth. Ensure trenches are dug promptly and strengthen pest and disease prevention, especially powdery mildew, heartworms, and leaf miners.
At present, during the peak of summer rains, farmers must prepare in advance for flood prevention. Orchards with high groundwater levels or low-lying areas should implement deep sorghum cultivation models, ensuring proper drainage systems. Flat orchards need to reinforce drainage ditches, while mountain orchards should repair and deepen protective trenches to ensure fruit tree safety. (Feixian Fruit Industry Administration, Xu Mingju, Zheng Xiaoyun)