The leaves are all rolled up, and there are no bugs in it, what s wrong?

It may be that there is not enough moisture, the temperature is too high, or the light is too strong. From a biological point of view, the roots, stems, and leaves of plants are the sites where major nutrients such as water and inorganic salts are transported. There are ducts and sieves in the heart of the plant.

The sieve tube can only transport organic matter is a relatively low-level transport pipe, while the catheter laboratory can transport water, inorganic salts and other organic matter in the heart of the plant with the conduit and the sieve tube. The sieve tube can only transport organic matter and is a relatively low-level transport pipe, while the catheter can transport a variety of nutrients. Moisture included.

The main factors for plant growth and survival are sunlight, soil, air, water, inorganic salts, nutrients, etc. Judging from these factors, it may be because the stem of the plant is damaged. Leads to necrosis of ducts and sieves, resulting in water, inorganic salts, organic matter, and leaves that cannot be transported to the leaf parts of the plant.

Without water, the plant's leaf transpiration does not work, and gradually, the center of the leaf is a branch area of the duct, which stores some water. The peripheral part of the leaf completely loses moisture, so it moves closer to the middle and rolls into a curl shape. And because of the lack of nutrients, insects cannot survive on the leaves, so the leaves are curled and there are no insects.

So lack of moisture is probably the biggest cause.

Peach leaf shrinkage disease, caused by fungi, of course, you can't see the insects, pay attention to prevention and control, to prevent the spread.

The most important thing is to look at the last one, the pathogen is removed, and it is not recommended to take medicine.

From the **, it seems that the leaves at the tip of a branch of a tree are curled, it should not be caused by sunlight, you check it carefully, it should be caused by insects, and there are generally netted filaments wrapped around the leaves on the leaves, or there is sticky matter in the leaf rolls.

Well, this is normal, I also have this phenomenon in my family, and it will be fine after a while (about three or four days)!

It's a disease, so let's see a specialist.

The outside of the leaf loses moisture before the center of the leaf, so it rolls up.

If the leaves are just rolled up without blackening or spots, it may be dehydrated.

Sometimes the persimmon tree grows luxuriantly in the same place, with many branches and leaves, and when it is moved to a new place, the old roots are cut off, and the new roots are not yet rooted, and the ability to absorb water is weakened, but the water evaporated from the branches and leaves is still the same. At this time, even if it is watered, it will not help, only pruning. to reduce water evaporation.

It could be a leaf-curling moth, or it could be a nutrient deficiency.

An insect, into.

The insect has a small body and broad forewings. The larvae eat the leaves of plants, or burrow into the fruit to eat the fruit, and some roll the leaves into a cylinder and spin silk in them to make cocoons. Harm fruit trees and other crops. Commonly known as leaf curlers.

Prevention and control methods: 1) Strengthen the management of tea gardens, scientific pruning, timely cultivation and weeding, so that the tea gardens are ventilated and transparent, which can reduce the occurrence of tea leaf moths.

2) When picking tea in spring, pay attention to pinching the hatched larvae and large larvae in the bracts.

3) During the adult occurrence period, set up insect trap lamps or sweet and sour solution to trap and kill adult insects.

4) In the peak stage of l and 2nd instar larvae, when there are 3 6 insects in each bush, spray 90 crystal trichlorfon or 80 dichlorvos EC, 50 malathion EC, 25 imimidhion EC, 50 pine borer EC, 75 acemethamidophos EC, 90 badan wettable powder and other 900-1000 times liquid. In addition, you can also choose 50 phosphine emulsifiable 1400 times liquid or 10 Uranus emulsifiable concentrate 5000 times liquid, 2 5 rotenin 300-400 times liquid.

5) Beauveria bassiana powder containing 10 billion spores per g is 0 5-1kg, which is effective in controlling l-2 instar larvae under rain and humid conditions.

6) 8-120,000 red-eyed bees are released per 667m2 in the egg stage, and the parasitism rate can reach 70-80. In addition, it can also be used for exohormone trapping, and it can also be sprayed with tea small curly leaf e-granulosa virus for biological control. Method:

Particulate virus (AOCV) field dosage is 220mg per km, which is equivalent to the content of 25 insect carcasses, 125kg of water, sprayed in the peak hatching period of the first or second generation larvae, the incidence rate of contemporary larvae is 95, and it can last for 8-9 years.

Persimmon tree management methods.

Fertilizing and changing soil. The persimmon tree is a deep-rooted tree species, and the tree should be expanded to change the soil and increase fertilizer in order to be vigorous. Persimmon trees should expand the hole in winter to change the soil, the hole length is 1 to the meter, the width of the meter, and the depth to the meter.

When backfilling the topsoil, apply 100 to 150 kg of soil miscellaneous fertilizer or 50 kg of pig and cow manure or 100 to 150 kg of mushroom soil or 1 to kg of calcium, magnesium and phosphorus fertilizer, etc., mix well with the topsoil and fill in the lower layer, and fill the hole surface with the topsoil in the garden.

Prune the branches. Adult production trees with tall crowns or cross-branches shady should be moderately retracted and pruned after falling leaves in winter, and short pruning should be used to combine thinning methods to cut off dense branches, cross branches, long branches and diseased branches, so as to promote reasonable branch distribution and pruning into a reasonable tree potential.

Carry out winter garden cleaning work. Winter pruning should completely remove diseased fruits, diseased stems, dead branches and fallen leaves, and remove the source of overwintering diseases and insects. Persimmon trees with severe scale insects should be sprayed with 95% engine oil emulsion (coafen) 150 times or 5 degrees of stone sulfur mixture before defoliation in winter to germination in spring.

Is it like this in the middle of the day, and then it recovers in the evening? It is made of high temperature and humidity, and it may be a lack of light, so try watering in the morning and evening!

It's likely that some element is missing.

Peach leaf disease should be prevented more than cured, that is to say, you know that your orchard has potential pests and diseases, to prevent it as soon as possible, dare to spray fungicides quickly, and at the same time prevent tumors and prevent it from rolling leaves

Pay attention to watering in time, usually watering is not timely, the root growth is not good, and the water and nutrients can not be absorbed.

After all, the laurel tree is also a squeamish plant, and the usual negligence may make it sick, so it is recommended to use it in normal timesProvide it with some potassium or putrid propagation fertilizerLet it gradually improve immunity and have a resistance to foreign germs.

Spray some foliar fertilizer to try, and add nutrient soil is best to apply together.

Is it caused by too much watering?

1 is the problem of lighting, Sun Liang 2 is the problem of watering, and Shu Kaichong 3 is the problem of disease. Normally, it is caused by a lack of management. In addition, many woody plants will naturally turn yellow potatoes and wither after a certain season.

I have powdery mildew, there are pesticides sold in the market, go and have a look, and by the way, ask the technician there to see how **.

Your plum tree may be nitrogen or potassium deficient.

Nitrogen deficiency: The plant is light green, the old leaves at the base turn yellow, and brown when dry. The stems are short and thin, with few branches or tillers, and premature senescence occurs. If the fruit tree is deficient in nitrogen, it is manifested as small fruit, few fruit, and hard peel.

Phosphorus deficiency: The plants are dark green, often red or purple, and dark green when dry. The stems are short and thin, the basal leaves turn yellow, the flowering period is delayed, the seeds are small and not full.

Potassium deficiency: The old leaves are first yellowed along the leaf margin, and the leaf margin is burning when severe.