University of California
Fruit Report
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LinkedInManganese (Mn)
Manganese deficiency is seldom a problem in stone fruit orchards in the San Joaquin Valley of California (survey). In a cool spring, mild symptoms can be seen on some leaves. These usually disappear as soon as the weather warms up. Treatment is only needed if more than 50% of the leaves show symptoms, or if mid summer leaf samples have less than 20 ppm Mn.