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How to prevent citrus litter
First, the reasons for the analysis 1, cold damage (1) As soon as the low temperature autumn frost, the leaves of the orange garden in the reclaimed land are frozen and dried. (2) Plants that are not resistant to cold, such as oranges and tangerines, have been planted in areas with frost. (3) Delayed harvesting after fruit ripening resulted in imbalance of water and nutrients, no restoration of tree vigor, and weak tree stress resistance. (4) Poor site conditions, strong soil viscosity, poor drainage cause root rot. 2, fertilizer damage (1) overwintering fertilizer nitrogen (ammonium) excess, capillary roots were burned, moisture, nutrient absorption was blocked, cold resistance decreased. (2) Long-term partial application of nitrogen fertilizer, late release, autumn shoots are not full, frost resistance is poor. 3. Diseases, insects, and phytotoxicity (1) Poor tree vigor due to poor management, especially long-term poorly drained orange orchards often cause disease, and spring branches and leaves fall. (2) Due to the high density of spider mites, black cockroach mealworms and insect populations during wintering, the prevention and treatment are not timely, resulting in a large number of leaves falling off. (3) When the winter garden was cleared, the concentration of pesticides used was too high. Second, preventive measures (1) After germination on the dried branches, in the top of the site of the short cut pruning, dry leaves should be promptly removed concentrated burned, remove pathogens. Strengthen the management of fertilizer and water and restore the tree vigor. In particular, spray the leaf fertilizer 3 to 5 times in time after germination. (2) Late-maturing varieties that are not frost-resistant are prohibited in areas with frost. (3) Harvest fruit in time after ripening. (4) For the orange ore with soil compaction and water accumulation, one needs to remove the soil (60-80 cm deep, which can be filled with organic matter and fine sand), and the second is to ditch the ridge, drain the water, and prevent the flooding. Fertilizer and multi-element fertilizers. (5) Prevention and control of anthrax and spider mite diseases.