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My Purple Dome New England Aster Has Yellow Leaves

The Purple Dome variety of the New England aster (Aster novae-angliae "Purple Dome") is native to the northeastern part of the United States. The dark purple flowers measure more than 1 inch in diameter and the plant produces them in profusion. Purple Dome is low-maintenance, drought-tolerant and butterflies flock to it. A common disease causes the Purple Dome New England aster's leaves to turn yellow.

  1. Cause

    • Aster yellows is caused by a phytoplasma, a small organism that is carried by the leafhopper. Many plants, including ornamentals and food crops, are susceptible to the disorder. As an infected leafhopper feeds from plant to plant, it spreads the disease. The phytoplasma multiplies within the leafhopper throughout its life. Symptoms appear on the Purple Dome New England aster within 10 to 40 days after initial infection. Both the leafhopper and phytoplasma thrive when weather is cool and wet in the summer and both don't tolerate hot, dry weather.

    Symptoms

    • Symptoms vary, depending on the aster's stage of growth at the time of infection. New plants exhibit stunting, with small, yellow leaves. Foliage may curl. Flower heads are deformed. Mature plants may show symptoms on only one side of the plant or all over, with mature leaves remaining green while new ones turn yellow. Floral symptoms include deformed flowers, flowers that remain green and leaves growing inside the flower or in place of it. The aster may fail to develop seeds.

    Control

    • There is no cure for aster yellows. Remove and discard infected Purple Dome New England asters to avoid the spread of the disease to your other plants. Remove weeds in the area as they may act as a host to the pathogen. The specialists at Missouri Botanical Garden suggest placing strips of tin foil on the soil between ornamental plants to confuse the leafhopper and discourage it from landing and feeding on the Purple Dome aster.

    Prevention

    • Dandelions and plantain are particularly susceptible to aster yellows and leafhoppers that feed on them may spread the infection to the Purple Dome aster. Removing weeds is a primary way to prevent the disease. Mulching the soil with oat straw may discourage leafhoppers. Scientists disagree on whether insecticide is suitable against the leafhopper in the residential landscape. Contact your county cooperative extension entomologist for recommendations of acceptable insecticides for the leafhopper in your region.

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