2018 Crop Protection Guide for Tree Fruits in Washington

Nutrient Sprays

Monday, December 17, 2018

Iron

Yellowing of leaves with a fine network of green veins is a typical symptom of iron deficiency in tree fruits. Iron deficiency is common in alkaline soils. Excess irrigation and poor drainage may exacerbate iron deficiency.

Trees affected by iron chlorosis may be made green by foliage applications of iron chelates or similar compounds.  This is a temporary measure and does not correct the basic cause, which is a related to poor root uptake in cool wet soils in  the spring.  Usually two sprays are required.  Apply the first about 4 weeks after bloom and the second about 3 weeks later.  Apply as a separate spray.

Caution:  Some iron chelate sprays may cause severe injury to fruit, especially pears.

Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us