Materials shown here are known to be compatible only as listed:
Calcium chloride (apple)—Compatible with wettable powder formulations of diazinon and phosmet (Imidan). Pears are more sensitive than apples to the above combinations. Calcium materials may cause injury when mixed with materials containing copper and zinc and possibly other heavy metals.
Zinc sulfate—May be combined with boron (Solubor) in delayed dormant sprays.