INSV (impatiens necrotic spot virus) is a disease with many faces: it can produce many different kinds of symptoms on many different herbaceous plants, including the stem cankering shown here on alstroemeria. Other symptoms typical of INSV include chlorotic mottle, yellow or brown spots or ringspots, and stunting of the new growth. If you suspect that a crop may be infected with INSV, send a sample to your university diagnostic lab, or purchase in-house test kits from Agdia. In addition to watching for suspicious virus-like symptoms in your crops, the other keys to INSV management are to monitor for Western flower thrips year-round, and to keep the greenhouse weed-free.