so how to manage September to ensure high output next year? Let's take a look at it.
management of young trees and first-bearing trees in January and September
The new shoots of rice in autumn shoots are drenched once in a long time with humic acid-containing water soluble fertilizer. According to the size of the trees, 3-5g of each tree is mixed with 2-3kg of water to make the autumn shoots strong.
Spraying multi-element foliar fertilizer can promote autumn shoots to turn green and age.
It is advisable to sparse the redundant autumn shoots last year, and leave 2-3 branches per branch. In late September, the branches are flexible and not easy to break. It is beneficial to form the crown as soon as possible by pruning the young trees.
If there is drought in September, let the trees get enough water to avoid premature flowering of young trees due to drought stress; It is necessary to re-apply nitrogen fertilizer to increase gibberellic acid content in plants and keep young trees growing vigorously.
management of adult trees in February and September
When picking fruits, one fruit should be cut twice, combined with pruning to remove internal branches, branches with diseases and insect pests, overlapping branches, etc., and wedding fertilizer should be applied in time, and high-nitrogen compound fertilizer should be used for flushing or using water-soluble fertilizer to restore tree vigor and promote flower bud differentiation.
after the middle and late-maturing varieties take out new buds in early September, spray them twice with potassium dihydrogen phosphate solution to promote fruit expansion and prevent fruit cracking.
The fruit trees with many hanging fruits should be well supported. After the fruits enter the period of rapid expansion, the peels begin to become thinner and enter the period of high incidence of fruit cracking. Besides watering, the garden should be covered with grass to cool down.
The first fruiting branches of fruit trees are mainly medium and long branches of 25-5 cm, and at the same time, the crown is enlarged; Short autumn shoots are used as fruiting mother branches in adult fruit tree culture.
In early autumn, if the shoots are close to maturity, it is suggested to continue to supplement water and fertilizer to ensure the nutrient supply during the whole shoot period and fruit expansion.
pest control in March and September
In September, diseases and pests such as canker, anthracnose, sand skin disease, fatty spot disease, leaf miner, red spider, thrips and aphids are easy to occur, so it is necessary to pay attention to drug protection and protect autumn shoots.
Aphids and psyllids can use beta-cypermethrin, imidacloprid and thiamethoxam, while leaf miner can use abamectin+imidacloprid and Spodoptera litura: 6 times of deltamethrin, 6 times of chlorpyrifos-methyl and 6 times of abamectin; Pyraclostrobin can be used for the prevention of canker and thiamethoxam, and for anthrax and lipomaculopathy.
September is the second peak period of red spider, so we should pay close attention to the insect situation and prevent it in time. We can choose 95% oil emulsion (or Dipyrifos EC and Luying EC) with 15 ~ 2 times of liquid and 2% amitraz EC with 1 ~ 15 times of liquid. Spraying .3~.4 degree stone sulfur mixture for 1-2 times in late September is beneficial to pest control and fruit coloring.
Colletotrichum gloeosporioides is easy to occur in the fruit growing period after heavy storm and in the early stage of fruit ripening, which will reduce the storage performance of orange fruit, and even lead to fruit dropping before harvest. You can spray .5% Bordeaux solution or 8 times solution of 75% chlorothalonil wettable powder, 8 times solution of 7% thiophanate methyl wettable powder or 6 times solution of 5% carbendazim wettable powder once every 15 days or so, and spray 2 times continuously.
The above is an introduction to the management of citrus fruit trees in different growth stages in September. No matter what kind of fruit trees, pest control is very important.
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recommended reading: the causes and control methods of citrus canker.