This year's citrus blossoms in Zhejiang Province were early and the flowering period was slightly earlier than usual. The weather at the flowering season was relatively fine and was conducive to fruit setting. In the middle and early May climate in this province, rainfall or abnormally high temperatures may occur during the flowering season. Fruit and pest control should be well protected. Wait for work. (1) Protect the fruit. In the middle and late May, it entered the first physiological fruit-drop period. At this time, most of the fallen fruits were small flowers with weak flowers and fell off together with fruit stems after the flowers were cut. For this year's small amount of orange trees, extra-root topdressing should be strengthened. 0.3% urea plus 0.2% potassium dihydrogen phosphate, or other fruit tree nutrient solution should be used for crown spray, and borax and other trace elements can also be added. The plant growth regulator protects fruit, and for navel oranges, special early-harvest mandarin oranges, local early tangerine and other varieties, a 50 ppm gibberellin (Yuhuan grapefruit 25 ppm) is sprayed at 3/4 Hua Xie, and 2,4-D should not be used. The young result tree wipes the summer bud every 7-10 days to facilitate the protection of fruit. For some strong trees, aiming at the intense competition of nutrients in shoots, we can select branches with 3-4 cm in thickness when we are grateful for 2/3, and 2-3 mm for the width of the ring. After peeling 20- Check again about 25 days, re-rub the healed tissue on the circumcision healed in advance, weak trees should not be cut. (2) Soil Fertility Management. In the first and second physiological droppings in mid-May, the weaker trees added a stable fruit fertilizer, mainly based on quick-acting inorganic fertilizers, and applied organic fertilizers. The application amount was about 10%-15% of the total annual amount. about. The general strain applied citrus special compound fertilizer 0.5-1 kg. Continue to clear the ditches, deepen green pressure, combine rice straw and weeds to cover the surface of the earth to increase soil organic matter. (3) Pest control: The citrus red spider grows faster with higher temperatures. When each leaf reaches 3-4 or more, 25% triazotin or fenbutatin EC may be used, or 1000-1500 times, or 73 % Kete 2000 ~ 3000 times liquid, you can also use 99% green Ying or 99.1% of the enemy dead insect EC 300-400 times liquid. The second prevention and treatment period of citrus scab was 2/3 of Hua Xie, and 80% of the necessary wettable powder 500-600 times was used, or 400-600 times of wettable powder could be killed. In May, it is also the breeding season for various species of oysters (Auricularia falciparum, Amaranthus falciparum, Acipenser nigromaculata, and Amaranthus tricuspidata). It is also necessary to carry out unicornis, swallowtail butterfly, leaf roller moth, gray mold, black spot disease, and resin. Disease, anthrax and other prevention and treatment.
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