What symptom does pear rust have? How to treat it?

In the process of pear planting, diseases and insect pests will occur for various reasons, among which pear rust is a common one, also known as red star disease. Once it occurs, it has a great impact on the quantity and quality of fruits. What are the symptoms of pear rust? How to treat it?

What are the symptoms of pear rust?

Leaf infection: orange yellow, shiny spots on the front of the leaf in the early stage, gradually expanded to nearly circular orange yellow in the middle, pale yellow at the edge of the disease spot, the outermost layer of yellow-green halo, dense yellow spots on the surface. When the weather is wet, it overflows pale yellow mucus, and when it dries, the small dots turn black. The diseased spot tissue gradually becomes hypertrophic, the back of the leaf is raised, the front is slightly depressed, and gray-yellow hairs grow in the raised position.

Fruit disease: early disease spots and leaves similar to the general, late yellow hair produced. When the rust-bearing organ matures, the apex ruptures, scattering yellow-brown powder. After the disease spots gradually blackened, disease leaves easy to fall off.

Host: host cypress disease, initially in the needles, leaf axils or twigs appear pale yellow spots, then slightly raised. In March of the second year after being killed, reddish brown or brown conical horns were gradually exposed through the epidermis, which were teliospore horns. The swelling was more obvious at the parts where teliospore horns occurred on the twigs. After spring rain, teliospore horn absorbs water and expands into orange tongue-shaped colloid block, which shrinks into wrinkled dirt glue on the surface when dried.

2. How to treat pear rust?

Pear rust also meant that pear trees would have spots of different shapes on their leaves. If they were not treated for a long time, the spots would spread, resulting in spots on the entire pear tree, which would affect the flowering and fruit yield. If pear rust was obtained, then it was necessary to spray some Fenxiuning emulsion and emulsifiable concentrate on the fruit trees in time. This could effectively alleviate the disease. One-time can not be used more, about a week to spray it once, only about four weeks, you can restore the original, spray the amount should not be too much, too much is also will affect the growth of pear trees, if in the flowering period of disease, the amount used is also need to be halved.

If pear rust is found in pear trees, it needs to be treated in time first. In sunny weather, prune them, prune the diseased branches and leaves, and expose them to light. This is very effective for their recovery and can make pear trees recover quickly. In addition to this, you can also spray some appropriate amount of nitrogen and phosphorus fertilizer to increase the resistance of pear trees. You can also use some decomposed organic fertilizer to replace compound fertilizer. It has a very good recovery effect on pear trees after disease, and water less during recovery.