ALWAYS good to have second opinions. Host plants are everywhere it seems for a weed, cultivar, etc., to carry a virus along. I tried to find a quote online that talks about high temps, virus, transplants, weeds as key words. No proof of what I am alluding to but as a precaution....and to indicate that the TPS is not carrying the virus. I treat with TSP, chlorine and hot water before drying down the seed and that is just another safe guard for my customers.
Quote:
The tomato yellow leaf curl virus and/or PLRV is not seed-borne and is not transmitted mechanically. The disease may be spread by whiteflies . Whiteflies have a wide host range. New plant growth attracts whiteflies, which feed on the lower leaf surface. It takes about 15-30 minutes for the whitefly to become infected by the virus. The incubation period is 21-24 hours, and the transmission period at least 15 min.
Factors that favor development:
- High temperatures, and low or no rainfall
- Presence of whiteflies
- Infected transplants
- Weedy fields
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