Impatiens necrotic spot virus
Impatiens necrotic spot virus is a plant pathogen usually transmitted by thrips causing various symptoms such as necrotic spots on foliage, wilting, stem death, curling of the leaves, yellowing, poor flowering, and sunken spots on leaves. The virus infects many plant species including tomatoes, lettuce, and orchids.
Signs of damage:
Symptoms of infection include a downward curling of the leaves, leaf tip dieback, stunting, necrosis of growing leaf tips, sunken ‘chicken pox-like’ spots on leaves (often with a surrounding halo), stem death and yellowing. Since these symptoms are so generic, extreme caution must be taken when introducing new plants to your greenhouse. Infected plants can not be cured and not all hosts display visible symptoms.
How to prevent:
Impatiens necrotic spot control focuses on excluding INSV and preventing its spread. Inspect any plants entering a greenhouse (e.g., new plant shipments, plants moved in from outdoors) for viral symptoms and thrips. Isolate new plants until they are determined to be thrips- and virus-free.