Shriveled Impatiens

Identification

• Impatiens are susceptible to gray mold disease, which is also referred to as botrytis blight. The causal fungus, Botrytis cinerea, is more prevalent during cooler spring and summer weather and during extended periods of light rain.

Damage

• The disease is characterized by the appearance of brown spots, resulting from dying plant tissues on all areas of the plants except the roots. Small, black, fungal fruiting bodies often develop within the spots. Affected plant areas start to rot and decay. Foliage and buds wilt, shrivel, and drop, and there is twig dieback.

Control

• Improving cultural conditions is an effective management strategy for controlling botrytis blight. Grow plants in well-ventilated areas, and avoid the use of overhead sprinklers. Prune and remove affected areas, and keep plants clear of debris. Recommended fungicides include Bacillus subtilis or chlorothalonil.