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Diseases of Azaleas and Rhododendrons

Diseases of Azaleas and Rhododendrons. “Plant disease is the rule, rather than the exception.” page # 79. AZALEA LEAF AND FLOWER GALL. Clue: look for fleshy growths FUNGUS: EXOBASIDIUM VACCINII (also on Camellia, blueberry, leucothoe and rhododendron) Treatment: pick them off!

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Diseases of Azaleas and Rhododendrons

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  1. Diseases of Azaleas and Rhododendrons • “Plant disease is the rule, rather than the exception.” • page # 79

  2. AZALEA LEAF AND FLOWER GALL • Clue: look for fleshy growths • FUNGUS: EXOBASIDIUM VACCINII • (also on Camellia, blueberry, leucothoe and rhododendron) • Treatment: pick them off! • Fungicide may be needed. • fungicide may be needed

  3. Lace Bug Hemiptera: Tingidae (Hemiptera: • Top of leaf has spotty appearance, similar to mite damage • Clue: look under leaf...

  4. Lace Bug evidence under the leaf • Lace bug inhabits the underside of the leaf • Look for sucking spots, • droppings, cast skins, and live flies • (mites don’t leave droppings)

  5. Lace Bug!1/8”, netlike pattern and dots on wings • Cultural Control: Spray underside of leaves in May • (may need to repeat in August - two generations per summer) • Check Virginia Pest Management Guide for specifics

  6. PhythphthorafungusAKA: Black root rot • wilting appears to be lack of water BUT... • don’t be tricked

  7. Clue: The root is really black! black!

  8. Stems may also appear blackTreatment: Replace with disease resistant cultivar,plant in new location that is “high and dry”Soil drenching with fungicide at 4-week intervalsD near where tthe root

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