dispose soil after late blight on tomatoes ??

Asked September 26, 2020, 1:32 PM EDT

after removing the plant is it necessary to remove the soil from the raised bed as well ? or can it be treated and re-used ?

Grays Harbor County Washington

2 Responses

According to PNW Handbooks,
http://pnwhandbooks.stage.extension.oregonstate.edu/plantdisease/host-disease/tomato-lycopersicon-es...

It usually does not survive in soil or dead plant debris. For an epidemic to begin in any one area, the microorganism must overwinter in potato tubers (culls, volunteers) or be reintroduced on seed potatoes or tomato transplants, or live spores must blow in with rain.
Potatoes are in the same family as tomatoes and can also be affected by late blight.

The one thing you must do--destroy ALL plant debris, even in the compost pile, and any volunteer plants that may appear. Either bury or bag and relegate all plant debris to your garbage can for pickup.

Next year, plant resistant varieties of tomatoes:
  • Tomato cultivars Mountain Magic, Wapsipinicon Peach, Matt's Wild Cherry, and Pruden's Purple had high levels of resistance to multiple races of the late blight pathogen in trials conducted by University of Wisconsin-Madison while the cultivar Legend, developed by OSU, was resistant to one race of the three pathogen races tested. 'Plum Regal', 'Defiant', and 'Iron Lady' also appear to have resistance to late blight. Some cherry tomato cultivars (Red Cherry and Sweetie) were more tolerant to late blight in WSU trials.
And plant them so they can grow without crowding, and prune to ensure good air circulation. Avoid overhead watering. Good luck next season!

Alice, thanks so much. will do better next year.