What disease causes round patches on apple fruits? How does it occur and what medicine should be used?

Apple fruit mottling disease is a common disease during the growth period of apple trees. Before coloring, the diseased fruit shows no obvious difference from healthy fruit. Only after the bagged fruit colors does the fruit surface become scattered with many nearly round yellow-white or red patches, appearing mottled, which seriously affects the production efficiency of apples. So how does apple fruit mottling disease occur? What medicine can cure it?

Symptoms:

In severe cases, the colored parts of the diseased fruit are uneven and bumpy, with a wart-like appearance. The quality deteriorates, directly affecting the fruit's appearance, causing it to lose or severely reduce its commercial value and greatly reducing the grower's income. However, this disease does not affect normal leaf growth. If the tree does not bear fruit and the fruit bags are not removed, it is not easy to detect.

Causes:

1. Improper soil and fertilizer management:

Most fruit growers do not pay attention to soil and fertilizer management in apple orchards. Very few carry out soil improvement measures such as deep plowing and soil modification. In the fertilization process, formula fertilization is not implemented; instead, a single chemical fertilizer is often used, without applying microbial bacterial fertilizer, silicon-calcium-potassium-magnesium fertilizer, etc., resulting in a lack of medium and trace elements in the soil. Some fruit growers even mistakenly apply fresh cow manure or raw organic fertilizer, and some mistakenly apply chlorine-containing fertilizer. These factors ultimately lead to acidification and hardening of the orchard soil, poor nutrient absorption and utilization, imbalance of various nutrient elements, severe tree decline, and severe occurrence of mottled fruit caused by viral disease.

2. Weak tree vigor:

Bearing too much fruit consumes excessive nutrients, and nutrients are not replenished to the tree in time, resulting in extreme nutrient deficiency in the tree body, weak tree vigor, and reduced disease resistance and stress resistance, which easily triggers the occurrence of mottled fruit and increases year by year.

Control methods:

1. Seize the key timing of virus replication for medication, to achieve the effects of inactivating virus activity and inhibiting viral pathogen replication;

2. Do a good job of nutritional rejuvenation of the tree body, using its immune capacity to inactivate virus activity and inhibit replication, ultimately allowing the viral disease to be eliminated as dead cells metabolize. In particular, apply some substances that help enhance the plant's immunity, such as zinc, polysaccharides, polypeptides, brassinolide, etc.

What medicine can cure it?

Spraying: Before budding, at the red bud stage, when 2/3 of the flowers have fallen, and during the key period for forming next year's flower buds and leaf buds (July and August), use "Aolike - Special for Fruit Tree Virus" 40g diluted with 30 jin of water to drench the roots or spray the diseased plants and fruit trees around the diseased plants.

Root drenching: For weak tree vigor and severe disease, use Qingkulike 300 times + Wofengsu 600 times + Diliwang 500 times for root drenching 1-2 times, to improve the tree's immune capacity and nutritional rejuvenation.