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IPM Scouting in Herbaceous Perennials

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Impatiens necrotic spotted wilt virus
IPM scouting in herbaceous perennials > impatiens necrotic spotted wilt virus
Pathogen: Impatiens necrotic spotted wilt virus (INSV).

Hosts include: Ajuga, Aster, Bracteantha, Camp-anula, Delphinium, Dianthus, Digitalis, Echinacea, Gaillardia, Gaura, Heuchera, Hosta, Leucanthe-mum, Lobelia, Lysimachia, Monarda, Oenothera, Penstemon, Phlox, Platycodon, Primula, Salvia, Scabiosa, Sedum, Tradescantia and Veronica.

Symptoms: Symptoms vary depending on the host but may include necrosis and spotting, ringspots, mosaic, mottling, distortion of new growth, stunting and plant death.

Spread: INSV is spread by western flower thrips. Once a thrips acquires INSV, it can vector the virus to susceptible hosts it feeds on throughout its lifetime. The pathogen can also be spread by sap transmission. Plants can be infected and show no symptoms; the virus can be spread from these plants. INSV can overwinter in the roots of infected plants.

Management: Scout incoming plant material for signs of disease and for thrips. Susceptible plants should be scouted regularly for thrips (see thrips section for more information). Avoid intermixing of more and less susceptible crops within the same greenhouse. Also avoid intermixing seed- and cutting-propagated crops. Eliminate weeds from the propagation area. Immediately remove symp-tomatic plants from the growing area. Diagnostic testing can be done by a plant diagnostic lab or at the growing facility with testing strips available from plant diagnostic companies.
Mottling and distortion on foliage
Mottling and distortion on foliage of Bracteantha caused by INSV.
Puckering and thickening
Puckering and thickening of Leucanthemum foliage infected with INSV.
Downward curling caused by INSV
Downward curling caused by INSV.
This information was developed from A Pocket Guide for IPM Scouting in Herbaceous Perennials by Jan Byrne and Raymond A. Cloyd. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2981).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 9/28/07