Treatment of rolling leaves of cherry trees

Water shortage: Cherry trees roll their leaves due to hot weather and lack of water, which can be alleviated by watering and proper shading. Aphids: if caused by aphids, imidacloprid and other pesticides need to be sprayed. Lack of nutrition: if potassium deficiency, potassium dihydrogen phosphate can be sprayed, or potassium sulfate fertilizer can be applied to the soil; if calcium deficiency, calcium lactate, calcium preparation GA, and Merrill Lynch efficient calcium can be used for prevention and treatment; if molybdenum deficiency, 1.2% ammonium molybdate solution can be sprayed on the leaf surface for prevention and treatment.

First, the treatment of cherry tree leaf curling.

1. Caused by water shortage

There are many reasons for leaf curling of cherry trees, especially in summer, when the weather is relatively hot, cherry trees are prone to leaf curling. If cherry trees are short of water just because of the hot weather, they only need more watering or proper shading. The symptoms can be relieved by themselves.

2. Caused by aphids

The curling leaves of cherry trees may also be caused by aphids. Aphids generally like to gather on the back of the leaves to suck juice, resulting in leaf curling and wrinkling. when aphids occur, 2000 imidacloprid or pyrethroid pesticides can be used to control them.

3. Caused by lack of nutrition

(1) potassium deficiency: Cherry trees can also cause curly leaves if they are lack of nutrient elements. generally, potassium deficiency will scorch the edge of the leaves and gradually spread from the tail of the new shoots to the top. The Summer Solstice scorched on the leaves of the old tree at the end of summer, and sometimes the leaves turn turquoise. Then the leaf edge curls parallel to the main vein, and gradually fades into burning shape. 0.2% 0.3% potassium dihydrogen phosphate can be sprayed during growth. Or the soil is fertilized with potassium sulfate.

(2) calcium deficiency: if cherry trees are deficient in calcium, the tip of the upper young leaves will curl and become brown and scorched after a few days, during which calcium lactate, calcium preparation GA and Merrill Lynch efficient calcium can be used for prevention and control.

(3) Molybdenum deficiency: if the cherry tree is short of molybdenum, its leaf veins will fade green, turn yellow in serious cases, easily appear yellow and orange spots of uneven size, the leaf is slender and deformed, the leaf edge is curled into a cup at the upper end, and then the mesophyll is shedding and defective. 1.2% ammonium molybdate solution can be sprayed on the leaf surface during the period.

2. Control methods of cherry aphids

1. Medicament drying

Water 2 parts, 40% omethoate 1 part, multifunctional plant synergist 1 part, mix and mix to make medicine liquid, brush the medicine ring about the width of 10cm on the tree trunk for protection, if the bark is rough, scrape off the old warped skin with a knife before applying medicine, and wrap it with a newspaper or plastic film after painting.

2. Trunk injection

You can use an iron cone to tilt the prickle hole from top to bottom on the trunk of the cherry tree to make it deep into the xylem, then use No. 8 syringe to inject 40% of dimethoate, then seal the hole, and wait 2-3 days to kill 95% of the aphids.

3. Spraying chemicals

The commonly used agents are 1500 times liquid 35% EC, 3000-4000 times liquid 50% aphid fog, 1500 times liquid 50% phoxim EC, 1500 times liquid 40% omethoate and so on. In order to improve the control effect, an appropriate amount of spreading agent can be added to the liquid. During the period, several agents should be used alternately to avoid the use of a single agent for prevention and control.

4. Protect natural enemies

The natural enemies of aphids are ladybugs, dragonflies, aphid flies and parasitic wasps, which have a very strong inhibitory effect on aphids, so we can spray broad-spectrum insecticides as little as possible, and we also need to avoid spraying pesticides in the period when there are many natural enemies, which is helpful to protect natural enemies and make use of these natural enemies to eliminate aphids and promote the fruit produced to be green and pollution-free.