https://www.planetnatural.com/pest-problem-solver/plant-disease/apple-scab/

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1. Chemical Management

Management of apple scab is focused on the prevention of primary infection by ascospores. This is because early infection by ascospores may result in poor fruit set and will result in more secondary inoculum throughout the season. Fungicide applications are therefore timed to coincide with the spring release of ascospores (between bud break and petal fall). Various fungicide chemistries are available for management of apple scab.

2. Genetic Resistance

Scab-resistant or scab-tolerant apples and crabapples are widely available. Levels of resistance/tolerance vary with cultivar, although most scab-resistant apple cultivars carry the Vf resistance gene from M. floribunda 821. For many years, resistance resulted in reduction and/or elimination of fungicide use for scab management.

3. Cultural Practices

Cultural practices should be combined with fungicides (chemical and/or biological) for an integrated pest management system. Two common cultural practices used to reduce apple scab are sanitation and increased air circulation. Sanitation eliminates inoculum during the growing season and during the overwintering season. Commercial growers use various methods to speed up leaf decomposition, thereby decreasing the amount of primary inoculum the following season. These include: applying urea to trees, just before leaf drop, applying urea to fallen leaves, and tilling fallen leaves into the soil or chopping them into small pieces. Another effective cultural practice is to lower wetness and humidity in tree canopies so that the environment becomes unfavorable for disease. Pruning and wide tree spacing can enhance air movement and allow sunlight to penetrate, which speeds up drying of leaves and fruit.

MrKaren A. Darbinyan thank you for all

Thank you Mr. Avinash Marwal

Thank you Dr. Avinash Marwal

Kindly see the following RG links and PDF attachment pertaining to prevention and control of "apple scab disease" caused by the fungus Venturia inaequalis.

Article Prevention and control of apple scab

Article Control of apple scab (Venturia inaequalis) with bicarbonate...

Article The use of inorganic compounds to control apple scab in inte...

Article An Overview of Apple Scab, its Cause and Management Strategies

Please see the link

https://www.apsnet.org/edcenter/disandpath/fungalasco/pdlessons/Pages/AppleScab.aspx

I agree with Arvind Singh

Dr. Arvind Singh thank you for all

Thank you Dr. Abdenour Kheloufi

ok

Is it scabies or scab?

You may follow the link:

https://www.planetnatural.com/pest-problem-solver/plant-disease/apple-scab/

Thank you Dr. Harasit Kumar Paul