Agriculture Reference
In-Depth Information
Manganese (Mn) Deficiency
Symptoms.
Manganese deficiency resembles iron chlorosis somewhat
but tends to appear as dull, chlorotic herringbone patterns on the
older leaves. Young terminal leaves remain green. Shoot tips may die
back, and flowering and fruit set are reduced.
Treatment.
Apply a foliar spray of an approved Mn-containing product
as soon as leaves are well developed. Follow label directions. High soil
pH can create manganese deficiency. Use sulfur to lower soil pH to 6.5
on alkaline sites.
Zinc (Zn) Deficiency
Symptoms.
Zinc deficiency produces stunted shoots. Leaves are small
and narrow with a striped, irregular chlorotic pattern between green
veins. Rosettes of leaves form at the tips of shoots, with bare wood be-
low the rosettes in a condition called “little leaf disease.” Fruit set, size,
and quality are reduced.
Treatment.
Apply an approved Zn-containing product as a foliar spray
beginning in early spring or as soon as symptoms develop. Follow label
directions.
Adapted, in part, from Cornell University tree fruit guidelines and
Garcia, E.
Orchard Nutrition
. University of Vermont Extension.
