The typical symptom of rusty fruit type is that, starting from the ankle, a rust-colored streak is generated radially toward the stem. This streak is formed by the corkation of epidermal cells, and many irregularities correspond to the ventricle. Severe disease, fruit cracking, fruit deformity, pulp stiffness, loss of food value.
There are no obvious symptoms before the coloring of the flower type. After the coloring, many non-colored near-round yellow-green patches are scattered, making the fruit appear red and green with a “flower face†shape. The diseased fruit is slightly sunken and the fruit surface is slightly uneven.
Before the coloring of the hybrid diseased fruit, rust-colored plaques were produced near the indole; after the coloring, there was a non-stained plaque around the rust-free spot or around the rust spot and the appearance was “flower faceâ€.
Preventive methods
There is currently no effective treatment for rust fruit disease, mainly prevention.
Cultivate and use disease-free seedlings or scion, and resolutely stop scion cutting on diseased trees, and strictly prohibit propagation of new varieties on diseased trees. This is the most important measure to prevent rust disease.
Avoid mixing apples and pears to prevent infected pears.
Clearing the diseased tree to find the diseased tree should be thoroughly eliminated immediately (the root of the diseased plant should be removed) to prevent the spread of the disease.
Pay attention to the operation of orchard to avoid using pruning trees, knives, scissors and saws to trim trees and prevent the spread of tools.
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