What pesticide works well for leaf curl on plum trees

For leaf curl on plum trees, you can spray the branches and leaves with dichlorvos emulsion solution or dimethoate emulsion, or you can use dicofol or hexythiazox, or a mix of miticide + imidacloprid, or fenpropathrin, or beta-cypermethrin 1000-1500 times dilution spray for control.

Causes of leaf curl on plum trees and control methods:

Cause 1: Plum red spot disease

Damage characteristics: Plum red spot disease mainly damages leaves and also infects fruit. In the early stage of leaf infection, orange-yellow, slightly raised, nearly circular spots with clear edges appear on the leaf surface. As the spots expand, the color deepens and the mesophyll in the diseased area thickens accordingly, producing many small red granules on the surface, which are the fungal spore organs. By late autumn, the diseased leaves turn red-black, with the upper surface sunken and the lower surface protruding, the leaves curl, and small black granules appear, causing early defoliation. When fruit is affected, orange-red round spots appear, which finally turn red-black, with many dark red small granules on the spots. The fruit becomes deformed, inedible, and easily drops.

Control methods:

1. Thoroughly clean up diseased leaves and diseased fruit in the orchard and burn them in a centralized manner. Pay attention to drainage to reduce orchard humidity.

2. Before bud break, spray 3-5 degrees Baume lime sulfur mixture; during the growing season, spray 50% carbendazim 600 times dilution or 70% thiophanate-methyl 800 times dilution, or 70% mancozeb 600 times dilution every 10-15 days.

Cause 2: Plum fruit moth

Damage characteristics: The plum fruit moth is a pest of the order Lepidoptera, family Tortricidae (more common in areas at 40-50 degrees north latitude). It is the most serious pest damaging plum fruit, with a damage rate as high as 80%-90%. Affected fruit often exudes teardrop-shaped gum at the insect hole, cannot continue normal development, and gradually turns purplish red and drops. Because its tunnel is filled with red frass, it is also vividly called "red bean paste filling."

Control methods: The key periods for controlling the plum fruit moth are the peak periods of each generation of adults and egg-laying, and the period when the first-generation mature larvae enter the soil. Spray 90% trichlorfon 0.8% solution, 50% malathion 1% solution, or 50% dichlorvos. Before the physiological fruit drop of plum trees, apply 50% phoxim 1%-1.5% solution broadly to the soil under the canopy. At the end of flowering (95% petal fall), when the small fruit is the size of a wheat grain, spray for the first time; dichlorvos, deltamethrin, fenvalerate, or lambda-cyhalothrin can all be used, spraying once every 7-10 days. From the perspective of integrated control, biological agents such as Beauveria bassiana can also be used to treat the soil under the canopy. After autumn, all fallen fruit should be swept up to reduce the source of insects the following year.

Cause 3: Aphids

Damage characteristics: Aphids mainly damage the new shoot leaves of plum trees. When new shoots are severely damaged, they curl, grow poorly, and photosynthesis is affected, leading to shedding, which affects fruit tree yield and flower bud formation and greatly weakens tree vigor.

Control methods:

1. In early spring, in combination with pruning, cut off damaged branches and destroy them in a centralized manner.

2. Spraying the tree: during the peak damage period, spray 50% dichlorvos emulsion 1%-1.5% solution, or spray 40% dimethoate emulsion 1%-2% solution, 50% malathion 1% solution, 50% phoxim emulsion 2% solution, or 50% menazon wettable powder 1.5% solution.

3. Reasonably protect or introduce natural enemies.

The above is the relevant introduction on what pesticide to use for leaf curl on plum trees. I hope it is helpful to everyone.