What kind of medicine is used to roll the leaves of plum trees

The rolled leaves of plum trees can be sprayed with dichlorvos emulsion or dimethoate emulsion, and can also be sprayed with dicofol or nisolan, mijing + aphid lice or cypermethrin and cypermethrin 1000-1500 times.

Causes of leaf curling and control methods of plum trees:

Cause 1. Plum red spot disease

Damage characteristics: plum red spot disease mainly harms leaves and also infects fruits. In the early stage of the disease, the leaves produce orange-yellow, slightly raised, clear-edged near-circular disease spots, with the disease expanding, the color deepening, the mesophyll of the diseased part also thickening, and many small red particles are produced above, that is, the spore apparatus of the pathogen. At the end of autumn, the diseased leaves turned red and black, sunken on the front, protruding on the back, the leaves curled and small black spots appeared, forming early deciduous leaves. Fruit damage, resulting in orange-red round disease spot, finally red-black, disease spot on a lot of crimson particles, the fruit becomes deformed, can not be eaten, easy to fall off.

Prevention and control methods:

① thoroughly cleaned up the diseased leaves and fruits of the orchard and burned them centrally. Pay attention to drainage and reduce the humidity of the orchard.

Before sprouting, ② was sprayed with 3-5 Baumetolite-sulfur mixture, and every 10-15 days, 50% carbendazim 600 times or 70% methyl topiramate 800 times, 70% mancozeb 600 times.

Reason 2. Plum heart borer

Damage characteristics: plum heart borer is a pest of Lepidoptera (Lepidoptera: Lepidoptera). It is the most serious pest that harms plum fruit, with a damage rate of 80% and 90%. The injured fruit often shed teardrop-like pectin at the wormhole, could not continue to develop normally, and gradually turned purplish red and fell off. Because its insect path is full of red insect dung, it is also vividly called "bean paste stuffing".

Control methods: the key period for the control of plum heart borer is the peak period of adult and spawning of each generation and the burying period of the first generation of mature larvae. Spray 90% trichlorfon 0.8% solution, 50% malathion 1% solution, 50% dichlorvos. Li Shu applied 50% phoxim 1% Mel 1.5% solution to the soil before fruit drop and under the crown. At the end of falling flower (95% falling flower), when the small fruit is the size of wheat grain, spray the first time, using dichlorvos, enemy killing, quick killing, Laifuling, spraying once every 7-10 days. From the point of view of comprehensive control, biological agents can also be used to treat the soil under the canopy, such as Beauveria bassiana. The fallen fruit should be swept away after autumn to reduce the source of insects in the following year.

Reason 3. Aphids

Damage characteristics: aphids mainly harm the new shoots and leaves of plum trees. When the new shoots were seriously damaged, they curled and grew poorly, affecting photosynthesis, resulting in shedding, affecting the yield and flower bud formation of fruit trees, and greatly weakening the tree potential.

Prevention and control methods:

① in early spring combined with pruning, cutting off the damaged branches, concentrated destruction.

② tree spraying: during the peak period of damage, 50% dichlorvos emulsion 1% Muth1.5% liquid, or 40% dimethoate emulsion 1% liquid, 50% malathion 1% liquid, 50% phoxim emulsion 2% liquid, 50% aphid pine wettable powder 1.5% liquid can be sprayed.

③ reasonably protects or releases natural enemies.

The above is the introduction of what medicine is used to roll the leaves of the plum tree. I hope it will be helpful to everyone.