Management of growing citrus after waterlogging

The heavy rainfall brought by Typhoon Juju on the 15th this year caused torrential rains in parts of Xinyi City in Maoming, Yangchun City in Yangjiang, and Luoding City in Yunfu, causing widespread disaster to rice and other crops, and serious damage to citrus and other fruit trees. After the flood, the management measures of citrus orchards should keep up in order to reduce economic losses. The following aspects should be done well:

1. Open deep ditches for drainage

After the flood, there is still stagnant water in some low-lying places, and a "ten" trench with a depth of 50 cm and a width of 33 cm can be dug in the orchard to drain water.

2. Help trees to wash leaves

Citrus trees that have been washed down should be upright and erected as soon as possible. For orchards scoured by topsoil, it is necessary to cultivate soil and protect roots as soon as possible, and do not cultivate soil too thick at the root neck to prevent rotten heads. Try to remove sundries and silt from the leaves of citrus trees, and it is best to clean the branches and leaves with a sprayer to ensure the normal physiological activities of the trees.

3. Loosen the soil in the whole garden

After the orchard flood, the soil is hardened and the roots are lack of oxygen, so ploughing and loosening the soil in the whole orchard should be carried out to promote the root growth. For citrus trees with serious rotten roots caused by waterlogging, they should be combined with ploughing and scraping the roots to dry them, so as to remove the festering roots.

4. Spraying fertilizer outside the root

For waterlogged citrus plants, due to the weakening of the ability of their roots to absorb fertilizer and water, foliar fertilizers such as 0.3%-0.5% urea plus 0.3% potassium dihydrogen phosphate or 10% mature human urine can be sprayed on the crown for 2 or 3 times, once every 10 days, to supplement nutrition, promote the growth of new roots, and restore tree potential.

5. Moderate pruning

In order to reduce the evaporation of water in branches and leaves, citrus should be pruned reasonably after waterlogging. Generally speaking, the heavily affected trees are pruned a little heavier, while the lightly affected trees should be trimmed lightly to cut off dead and weak branches.

6. Disease and pest control

After the flood, the flooded citrus orchards are easy to suffer from diseases and insect pests, especially canker, scab, anthrax and red spider. After the flood, corresponding sterilization and pesticides should be sprayed in time to prevent the occurrence of diseases and insect pests. For the prevention and treatment of canker, you can choose to kill, copper oxychloride, agricultural streptomycin and other drugs; anthrax and scab can choose mancozeb, bacillate, methyl topiramate, carbendazim, Shigao and other drugs. Red spiders can use mites, propargite, nisolang, azadirachtin, avermectin and other drugs. In the prevention and control of diseases and insect pests, we should pay attention to the rotation of drugs and avoid the use of a single pesticide.