Key points of Autumn Management of growing Citrus

First, the heavy application of Zhuangguo fertilizer accounts for about 30% of the annual fertilizer application, mainly mature organic fertilizer, digging arc ditches 20-30 cm deep and 20 cm wide at 50-100 cm between rows, 2.5 kg cake fertilizer per tree, 50 kg rotten pig and cow manure or human manure per tree, 1.5 kg cake fertilizer per small tree, 25 kg rotten pig and cow manure or human manure, and then irrigate the soil. In addition, the crown should be sprayed with foliar fertilizer for 2-3 times, which can be sprayed with a mixture of 0.3% urea solution and 0.2% potassium dihydrogen phosphate every 10-15 days.

Second, irrigation drought resistance from July to September, when the high temperature and drought season, when the growth and fruit development need a lot of water, should be irrigated once in 10 consecutive days of drought. After 1-2 days of irrigation, plough once to reduce water evaporation, or cover the soil with weeds and leaves to cool down and preserve water and resist drought.

Third, the early and robust autumn shoots are the important basis for the sustained high quality and high yield of orange trees in the coming year. Since the middle and late July, sporadic autumn shoots were wiped out every 2-3 days, until the low bee period in early August (when the leaves at the base of the autumn shoots were damaged, and when the middle and upper leaves were free of insect pests, it was the low valley period), and the early autumn shoots were put uniformly, that is, the autumn shoots were kept 20-30 cm long and the late autumn shoots were removed in time. This not only cultivates robust early autumn shoots, but also avoids or reduces the harm of leaf miner moths.

Fourth, when the autumn shoot grows to 2-3 cm, spray 20% isocarbophos emulsion or 1000-1500 times isocarbophos emulsion, or 40% speed killing EC 800-1000 times. It mainly treats leaf miner, red spider, rust wall lice and scale insects. Spraying 0.3 degree stone-sulfur mixture in late August, mainly for red spider, rust wall louse and leaf miner. In early September, propargite sprayed with 2000-3000 times liquid was used to treat rust wall lice and red spider. The 800-fold solution of topiramate was used to control anthracnose for 2-3 times in a row with good results.