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Apples can play an important role in home cookery and nutrition . The fungus , unlike many other rust fungi , completes its entire life cycle on one host . Confirmed cases should be removed and destroyed , together with adjacent soil . Geranium rust , unlike many rust fungi , completes its entire life cycle on geraniums . Since high humidity is an important factor , certain cultural practices can help prevent the disease , or decrease its severity . The growth habit is round-headed and spreading . An important result of PHC is that roses in healthy condition are less impacted by insects than plants under stress . In many varieties , pale flower color is also indirectly caused . Unlike many other plant pathogens that have narrow host ranges , foliar nematodes , particularly Aphelenchoides fragariae , have broad host ranges and are capable of infecting hundreds of species of plants .