The guide can be found on the tree fruit page of the site and it covers every aspect of commercial apple production - from pest and disease management to post-harvest treatments.
It was originally funded by Defra and distributed to growers in paper form, but the HDC has paid for its authors to update the content for the new electronic format.
HDC communications manager Scott Raffle said: "I am delighted that the Apple Best Practice Guide is now available to HDC members on the website. The beauty of the electronic format is that we can up-date individual sections as new information becomes available.
"As the HDC funds new research projects and new information comes to light, our contractors will be able to revise the best practice information accordingly and it will become instantly available."