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In page Phytophthora megakarya:

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Chemical control is often necessary to conserve yield, although it can come at a very high price.[11] Chemical control targets the initial inoculum, reducing the amount of mycelium and sporangia present. In west Africa chemicals are applied using spray tanks.[5] Fungicides such as copper oxychloride, Mancozeb, and Metalaxyl+Mancozeb are typically used.[12] Mixtures of these chemicals can be used to prevent the pathogen from acquiring resistance to certain chemical compounds.[12] Many of these fungicides contain heavy metals which can be damaging to the environment.[11] Spraying is recommended 4-6 times a year from the last week of May to the end of the growing period.[12][11] Overuse of chemicals will result in increasing amounts of heavy metals being absorbed into the environment.[13]