How to do well the Management of Autumn Citrus during the period of strong Fruit and shoot

Autumn is the key period for strong citrus fruit sprouting, so it is necessary to strengthen management in order to achieve high yield. The techniques are as follows:

Autumn management of citrus

First, re-apply autumn fertilizer to strengthen the fruit and promote the shoot. Before the middle of September, give the citrus a strong fruit to promote shoot fertilizer. Digging annular fertilization ditches 1-1.2 meters long and 0.3 meters deep and 0.3 meters wide near the crown dripping, each adult-bearing citrus tree was treated with 100-200 kg mature human and animal manure or retting compost and 1.5-2 kg calcium superphosphate, 1-1.2 kg urea or 2 kg ammonium bicarbonate, the young fruit trees were halved, and the young trees were further halved.

Second, irrigation and moisturizing, drought resistance and fruit protection. The citrus orchards were irrigated in the morning and evening of the summer drought period from August to September, and the resulting citrus trees were not less than 100-150 kg per tree. And cover the ground with weeds, artemisia stalks and vines to moisturize, resist drought and protect fruit.

Third, thinning buds and raising shoots, ring cutting to promote flowers. In late September, the sharp bud grafting knife was used to cut 1-3 whole circles on the 2-3 branches of citrus trees with few fruit but prosperous growth this year, reaching to the xylem to promote flower bud differentiation. After ring cutting, 0.2% potassium dihydrogen phosphate and 0.3% urea were sprayed every 20 days, followed by the addition of 30-40ppm 2.4 murine D solution (30-40 ml of 2.4 murine D aqueous agent with a concentration of 5%) for 3-4 times in a row to prevent defoliation in winter and spring.

Fourth, multi-head high connection, the replacement of improved varieties. At the beginning of September, the inferior and low-yield citrus trees with normal growth and less than 30 years old were replaced by high-end grafting to develop high-quality navel oranges such as abundant navel, Pengna and Qingjia, superior Jincheng oranges and extra-precocious Wenzhou mandarin mandarins such as Xieshan, Miyagi and Dapu. By using the method of "single (double) bud ventral grafting", the buds were uniformly grafted on the erect branches and oblique branches with a diameter of about 2cm in the middle and upper part of the crown.

Fifth, forecast and control diseases and insect pests. From August to October, high temperature and humidity, high incidence of citrus diseases and insect pests, with emphasis on the control of anthracnose, rust wall wind, red spider, sagittal scale, etc.; in the summer drought period, when the young citrus fruit appeared "black charcoal pill", immediately used 0.3-0.4ppm stone sulfur mixture to control 1-2 times; for citrus red spider, observe the new leaves of citrus shoot in the same year, when there are about 5 insects in each citrus leaf, spray it with 3000 times EC. In the first and middle of September, when the young scale reached about 50% of its eggs, it sprayed 1200 times EC 1-2 times at a speed of 40%.