Last year my orchard had a very bad outbreak of apple scab, as can be seen from this Honeycrisp tree.
I watched a lot of youtube videos to learn what I could to prevent scab, finally finding this video.
It explains that Scab feeds on the amino acid arginine, found in apple leaves, and that arginine is only found in leaves when a tree does not have enough cobalt to process arginine further. The video states that several orchards which used a cobalt fertilizer were subsequently scab free.
So I watched more of the company who produced the video, Advancing Echo Agriculture. I purchased a couple of there products, including one with cobalt, and have been spraying on my trees this year.
Here's a picture of my Honeycrisp tree today, with no fungicides applied.
I'll post some more info on what else I'm using and how it seems to be working in a couple of days.
I watched a lot of youtube videos to learn what I could to prevent scab, finally finding this video.
So I watched more of the company who produced the video, Advancing Echo Agriculture. I purchased a couple of there products, including one with cobalt, and have been spraying on my trees this year.
Here's a picture of my Honeycrisp tree today, with no fungicides applied.
I'll post some more info on what else I'm using and how it seems to be working in a couple of days.