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To avoid this , remove most of the thin , weak branches that have many flower clusters and few leaves . These beetles also attack blackberry , clover , coreopsis , hollyhock , honeysuckle , iris , lilies , and peonies and vegetables such as peas , beans , cantaloupe , corn , and cucumbers . Most root rots are caused by various species of soil-inhabiting fungi , which require cool , moist soils in order to grow and multiply . If the graft union is placed close to or below the soil line , the scion will take root , causing a semi-dwarf tree to grow to full size . The fungus , unlike many other rust fungi , completes its entire life cycle on one host .