Controlling pg.2
The removal of nut clusters and heavy leaf pruning of large trees have probably aided disease spread. Microscopic Phytophthora spores from diseased tissue will contaminate cutting tools and infect healthy trees during subsequent pruning operations. Furthermore, wounding the stem base by cutting off green fronds exposes highly susceptible plant tissue to Phytophthora infections. When feasible, tree trimming should be done during dry weather.
Tools should be cleaned, then immersed in a disinfestant after trimming operations on each tree are completed, especially at sites known to have this disease. Fungicides such as Subdue 2E (metalaxyl), Dithane M-45 (mancozeb), Aliette (fosethyl-Al), and Truban (ethazole) are known to be effective protectants against other Phytophthora diseases, but they are not effective for curing trees with advanced rots of the heart or terminal bud.
Limited control of this disease in the early stages may be attained by removing diseased fruits on trees that do not have young dead leaves, then protecting the wound surface with a pruning sealant, thus preventing disease progression into the trunk.
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