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Apple and pear trees require patience , knowledge and skill to grow well . A key sign of Botrytis infection is the proliferation of gray mold covering the diseased plant . Some indoor plants often affected are geranium ( especially the ivy-leaved types ) , clivia or Kaffir lily , peperomia , jade plant , members of the Ficus family , schefflera , epiphyllum ( orchid cactus ) , English-ivy , and begonia . Infected plants may also produce a proliferation of spindly , secondary shoots , giving the plant a bushy appearance . Control of this disease is best accomplished by preventing the entrance of phytoplasmas into the garden .