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These beetles also attack blackberry , clover , coreopsis , hollyhock , honeysuckle , iris , lilies , and peonies and vegetables such as peas , beans , cantaloupe , corn , and cucumbers . Susceptible flowers include aster , chrysanthemum , cockscomb , coreopsis , cosmos , daisy , dianthus , echinacea ( coneflower ) , gladiolus , marigold , petunia , and phlox . Apple and pear trees require a site in full sun , so choose a spot where the sun shines directly for at least 8 hours each day . Hosts commonly include , but are not limited to : begonia , carnation , chrysanthemum , cyclamen , geranium , impatiens , marigold , petunia and zinnia . Susceptible flowers include asters , cockscomb , chrysanthemum , coreopsis ( core-e-OP-sis ) , cosmos , echinacea ( purple coneflower ) , dianthus , glads , marigolds and petunias . Most garden soils in Minnesota have pH readings above those that are optimum for blueberries ( most soils are too alkaline ) . Common hosts include begonias , alpine current , bee balm , lilac , phlox , rose , and zinnia . A soil pH of 5.5 to 7 ( moderately acidic to neutral ) is optimal , but growth is fine in alkaline soils as well .