How to manage citrus in summer? Detailed explanation of key planting techniques
How to manage citrus in summer? Please give an introduction. For managing citrus in summer, you can refer to the following methods: 1. Remove shoots to protect fruit. In summer, temperatures are high and there is plenty of rain, so citrus tends to sprout a large number of summer shoots, consuming a large amount of nutrients and intensifying the second physiological fruit drop. If the summer shoots are allowed to grow, it may cause reduced yield or even...
How to manage citrus in summer? Please give an introduction.
For managing citrus in summer, you can refer to the following methods:
I. Remove shoots to protect fruit
In summer, temperatures are high and there is plenty of rain, so citrus tends to sprout a large number of summer shoots, consuming a large amount of nutrients and intensifying the second physiological fruit drop. If the summer shoots are allowed to grow, it may cause reduced yield or even total crop failure. Therefore, removing and wiping out summer shoots is the most reliable measure for protecting fruit. Generally speaking, for young vigorous trees that have entered the fruiting stage, because they bear little fruit and have strong tree vigor, they tend to sprout more summer shoots, so more attention should be paid to timely shoot wiping. When summer shoots grow to 7-10 cm, remove them all from the base, then wipe them again after an interval of 5-7 days, and wipe them thoroughly once more in early August, then release autumn shoots. For trees that have entered full fruiting stage, or trees bearing more fruit, the number of summer shoots is smaller, but buds should still be wiped in a timely manner. In late July, release autumn shoots again to lay the foundation for stable production the following year.
II. Apply fruit-strengthening fertilizer as a top dressing
In late June, the second physiological fruit drop of citrus is basically over, and the number of fruits per tree is basically determined. The fruit enters the expansion growth stage and needs a large amount of water and nutrients, so fruit-strengthening fertilizer must be applied in a timely manner. A compound fertilizer containing potassium sulfate is the best choice. For trees over ten years old or bearing more than 400 fruits, apply 2 jin per tree. For young trees or trees bearing little fruit, reduce accordingly according to tree age and fruit load. You can also choose 50 jin of farmyard manure, half a jin of urea, and half a jin of superphosphate. Early-maturing varieties can be treated from late June to early July, while mid-to-late-maturing varieties should be treated in early to mid-July. Dig a hole on one side of the tree canopy, 30 cm deep, 20 cm wide, and 100-120 cm long, and mix the topsoil with the fertilizer evenly. Bury weeds from around the tree disk into the bottom of the hole, then backfill with subsoil. Never broadcast the fertilizer.
III. Prevent and control pests and diseases
May is the period when the first-generation larvae of citrus scale insects, whiteflies, and red spider mites appear in concentrated numbers. Pay close attention by tapping both sides of the leaves with your hand. If more than 2 red spots remain on your hand, spray pesticide in a timely manner. For red spider mites, use 73% propargite 2500-fold solution or 5% hexythiazox emulsifiable concentrate 2000-fold solution. For scale insects and black citrus whiteflies, use 40% methidathion emulsifiable concentrate 1500-fold solution or 25% buprofezin wettable powder 2000-fold solution.
May to July is the egg-laying period of longhorn beetles. First, promptly capture and kill adults; second, whitewash the main trunk with lime to resist longhorn beetle egg-laying; third, inspect the main trunk in a timely manner. Once moisture or sawdust is found, first use a wire hook to kill the larvae, then plug the hole with poisoned cotton.
June to July is also the key time to control rust mites, especially in citrus orchards where this pest caused damage the previous year. Choose 15% pyridaben emulsifiable concentrate 2000-fold solution or 73% propargite emulsifiable concentrate 2500-fold solution.
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