Tips on Applying Foliar Nutrients
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Urea, Solubor, Zn EDTA and Epsom salts are usually compatible (do not apply urea plus Epsom salts together on young apple trees).
- Epsom salts and some boron products may raise the pH of the spray solution. Be careful with pH sensitive products.
- Do not use boron with pesticides in water-soluble packages.
- Do not combine Solubor with calcium chloride.
- Do not mix Solubor with oil.
- Do not use calcium chloride with Epsom salts or zinc chelate.
Boron deficiency in apples generally expresses itself as cork spot on the surface of the fruit or as internal
corky areas in the fruit that are not visible on the surface. Boron applied as a foliar spray at petal
fall (and in severe cases, a second application at first cover) can lessen the incidence of cork spot.).
Calcium deficiency corking will look very similar to boron deficiency corking.
Corking is a bigger problem under conditions of excess tree vigor and moisture stress. Stink bug damage can also cause surface corking that looks very similar to boron and calcium deficiency corking. With stink bugs, the affected areas are more apt to be on the backside of the fruit, especially where the apples are in clusters.
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