What medicine should be applied when citrus is hanging fruit What medicine is good to keep citrus tr

Citrus hanging fruit period is not safe, it is better to invest more in the use of good fertilizer, fertilizer use is good, but also to prevent the problem of various pests and diseases, but also safe and assured, top dressing can chase water-soluble fertilizer, more nutrition, fast dissolution, good absorption, like high potassium water-soluble fertilizer, can make citrus big, good taste.

Middle-aged fruiting trees are fertilized 4-5 times a year, mainly before and after fruit picking, before spring shoots, and before autumn shoots. Late-maturing seeds, medium-maturing varieties with more fruits, and weaker fruiting trees should be applied before fruit picking; Early-maturing seeds and medium-ripening seeds with little fruiting amount are applied after fruit picking. It is best to apply ponkan before fruit picking, and orange orchards with little rain and no irrigation conditions should also be applied early, mainly with water-soluble fertilizer in Ribery.

First-fruiting trees (3-4 years old) are repeated in winter, before spring, and before autumn. The principle of not doing it before the summer. That is, from December to January of the following year, fertilizer is applied after fruit picking, which is needed for the spring shoot period, and water-soluble fertilizer is the main one.

In February, the strong trees before the spring shoots were not applied, and the weak trees were applied with water-soluble fertilizer once to promote the growth of spring shoots. In May and June, no fertilizer is generally applied to control the growth of summer shoots. Re-apply before autumn, mainly with fast-acting water and fertilizer, the purpose is to promote the autumn shoots, lay a good foundation for the second year to increase production, 8-10 months can be applied 1-2 times of water-soluble fertilizer to strengthen shoots and fruits.

When citrus just enters the fruit-bearing period, pay attention to the prevention and control of fungal diseases on the fruit surface, mainly fungicides + insecticides, mainly to prevent and control anthracnose, scabs and thrips, red spiders, and scale insects.

After the citrus fruit hangs, you can use fruit-preserving fertilizer to spray organic acid boron-calcium foliar fertilizer on the foliar surface, which can effectively prevent fruit drop and promote fruit expansion in the later stage.

Hello dear, the common citrus preservatives used for freshness on citrus trees are as follows: 1. Mildew inhibition (1) azimazole emulsifiable concentrate, the concentration of 250-500mg l (444-888 times the solution) when soaking fruit preservation, soaked for 1 minute and then taken out, for the prevention and control of green bacteria. (2) 50% imazole emulsifiable concentrate, the concentration of 250-500mg l (1000-2000 times the solution) when soaking the fruit is fresh, soaked for 1 minute and then taken out, for the prevention and control of green bacteria.

2. Biguanide zinc amine acetate 40% biguanide zincamine acetate wettable rock disturbance powder, the use concentration of 200-400mg l (1000-2000 times the liquid) when soaking fruit preservation, soaked for 1 minute and then taken out and stored, for the prevention and control of diseases during the storage period. 3. Thioamphanate 45% thiophanate-based suspension, the concentration of 1000-1500mg l (300-450 times the solution) when soaking fruit preservation, soaked for 1 minute, then taken out to dry and store, for the prevention and control of storage diseases. 4. Prochloraz 25% prochloraz EC, the concentration of 250-500mg l (500-1000 times liquid) when soaking fruit and jujube is fresh, is used for the prevention and control of citrus anthracnose, pedicle rot, green mold, penicillium, etc.

5. Prochloraz manganese salt 50% prochloraz manganese salt wettable powder, the concentration of 250-500mg l (1000-2000 times the liquid) when soaking fruit preservation, soaked for 1 minute, taken out and stored, used for the prevention and treatment of anthracnose.

After the beginning of fruit coloring, use amine fresh ester + potassium dihydrogen phosphate, and spray protective fungicides with amine fresh ester + calcium magnesium foliar fertilizer next time to prevent fruit diseases and promote the bright peel of Hu Deficiency Fruit. Different fruit trees, there will be different pests and diseases, the fungicides used are very different, the concentration is also different, but the method and principle are the same, that is, at the end of the flowering period, when the young fruit begins to expand, spray Bordeaux liquid, non-defense machine sulfur compounds, organosulfur compounds, phthalammonium phthalammonoids, antibiotics protective fungicides, can effectively prevent a variety of diseases that harm the fruit, in the fruit expansion period, you can also choose fungicides for spraying, can promote the normal growth of the fruit, with the change to promote the peel bright.

Citrus hanging fruit can be hit allicin, allicin is generally applied before the citrus veraison period (around September), choose a day with a moderate temperature to spray, avoid cloudy days after veraison, if the potion on the fruit is not dry at night after spraying, it is easy to burn the fruit. Note: Citrus with allicin at the young fruit stage will have a certain effect, and black spots may appear.

Allicin can control a variety of diseases caused by fungi and bacteria in citrus, such as citrus moss, anthracnose, penicillium, canker disease, etc.

Citrus enters the fruit-preserving period and is inseparable from regulators, so gibberellin and benzylaminopurine have also become a hot topic for citrus fruit preservation.

For some old fruit farmers, there is a complete set of fruit preservation programs in citrus fruit preservation, because they know that citrus is a fruit tree with a large amount of flowers, and it is difficult to preserve fruit by itself, so hormone fruit preservation is a relatively stable technology, among which gibberellin and benzylaminopurine can effectively prevent citrus physiological fruit drop and reduce the amount of fruit drop.

Although these two regulators can protect the fruit, but the experienced old fruit farmers in the process of use, gradually found that benzaminopurine is very effective in preventing the first physiological fruit drop of young fruits, and will not cause thick peel, but it can not have such a good effect when used in the second physiological fruit drop, and gibberellin is very effective in preventing the first and second physiological fruit drop of young fruits, but there are strict requirements on the concentration and number of uses, otherwise it will cause thick peel.

After the flowers are 8 years old, immediately hit the fruit protection medicine (gibberellin) plus foliar fertilizer (mainly to promote the small fruits to turn green and the spring shoots to mature) + fungicide. After 10 days, a second fruit preservation will be performed.

I use fruit-preserving fertilizer, organic titanium-boron-calcium foliar fertilizer, fruit set is more stable, and the quality and taste of the fruit in the later stage are good!

<> "After citrus picking, citrus trees generally need to be sprayed with pesticides such as tung bark fungicides. For example, plants with many hanging fruits and weak trees can be applied with 2-3 catties of Aonongle soil conditioner per plant; Plants with root rot and yellowing were irrigated with R. solanacearum (300 times solution), Diliwang (300 times solution) and Wofonsu (600 times solution). When clearing spring potatoes, you can spray 1 time with Ulcer (150-300 times liquid) and Tianda 2116 (special for fruit trees).

For different pests and diseases, different agents should be selected, as follows:

1. Scab disease.

On the basis of clearing the garden in winter and strengthening the management of orchards, the disease should be prevented by pesticides in three periods: the first time when the spring buds grow to 1 2 mm, the second time when the flowers are two-thirds down, and the third time when the young fruit beans are large.

The agent can be sprayed with the same amount of Bordeaux liquid or 20% thiamium copper 500 700 times solution, 20% Dysen water dispersible granules 500 700 times liquid.

2. Anthrax.

Combined with spring pruning to remove diseased branches and fruits, the protective branches and leaves should be sprayed once in the tender shoot period of spring, summer and autumn, and the young fruits should be sprayed once every 15 days within 1 month after flowering, 2 3 times in a row.

You can choose 80% mancozeb, Lu Qiaoda wettable powder 400 600 times liquid or 50% carbendazim wettable powder 600 times liquid and other sprays.

3. Psyllids. The insect pest is a vector of citrus huanglongbing, and the spring shoots should be sprayed once when they germinate to 2 5 mm, and then sprayed once every 7 10 days.

It can be sprayed with 40% propyl bromide emulsifiable concentrate 1000 times or 40% chlorpyrifos emulsifiable concentrate 800 times, 22 methyl cyano azolephos emulsifiable oil 1000 times.

4. Red spider.

When there are 6 insects per leaf, spraying should be sprayed.

You can choose 99% mineral oil emulsifiable concentrate 200 250 times liquid or avermectin emulsifiable concentrate 1000 1500 times liquid and other sprays.

5. Leaf miner.

In the period of overwintering adult unearthing activities, 40% chlorpyrifos emulsifiable concentrate 1000 times or 80% dichlorvos emulsifiable concentrate 800 times liquid and other agents are sprayed, and combined with ground spraying 40% phoxanthal 400 600 times solution.

In early April, the peak period of young nymphs can be treated with 25% imidothion emulsion 800 times or 48% chlorpyrifos emulsifiable concentrate 1000 times, avermectin emulsifiable concentrate 3000 times and other spray control, severe spraying 2 3 times after 5 7 days.

6. Flower bud maggots.

When the flower buds begin to turn white and the adults begin to emerge and unearthed, 80% dichlorvos EC 800 times or 20 fenvalerate EC 3000 5000 times can be used for ground application control, 5 7 days 1 time, spray 2 times;

Most of the flower buds are white (2 3 mm in diameter), and before the adults are unearthed from the tree and do not lay eggs, they can be controlled with 90% trichlorfon 1000 times or 40% deltamethrin EC 1500 times, 10 cypermethrin EC 1500 2000 times, 40% octathion EC 400 600 times, etc.