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Know the symptoms of tomato spotted wilt virus in chrysanthemum

Growers propagating or finishing chrysanthemums should know how to recognize tomato spotted wilt virus (TSWV) symptoms. TSWV has been detected in chrysanthemum crops every season in recent years and has now been found in 2015. TSWV is a tospovirus, which means it is vectored by piercing insects such as thrips. The three most common thrips species in Michigan are western flower thrips (Frankliniella occidentalis), onion thrips (Thrips tobaci) and tobacco thrips (Frankliniella fusca). Western flower thrips are the most common species found in greenhouses; however, chrysanthemums could be exposed to other species when greenhouse sides are open, when greenhouses are being vented or if the mum crop is grown outdoors. As temperatures will be above 80 degrees Fahrenheit for the next 10 days, thrips will be reproducing rapidly. It is essential growers continue to scout for TSWV symptoms, test for the virus and rogue out any infected plant material.


Yellow blotching from tomato spotted wilt virus on chrysanthemum. Photo by Heidi Wollaeger, MSU Extension

Tomato spotted wilt virus symptoms
TSWV symptoms include yellow blotching or rings, brown, necrotic spotting and graying and stem collapse, often directly under the flower. Growers will not be able to visually identify the virus as it has similar symptoms to other viruses and pathogens. Therefore, growers will need to submit samples to Michigan State University Diagnostic Services or perform in-house testing to verify suspected plants do have TSWV.

Click here to read the complete article at msue.anr.msu.edu.
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