late blight on tomatoes

Discussion in 'Organic Lawn Care' started by turf hokie, Jul 17, 2009.

  1. turf hokie

    turf hokie LawnSite Silver Member
    Messages: 2,753

    I know this is lawn care forum, but I thought you guys might be able to help. We have late blight pretty rampant around here, so far I have been lucky but a buddy of mine not so much. I found the info below. Does anybody know where I can get any of these for the garden.


    Management In Organic Crops
    Apply fungicides preventatively, using a five-day schedule when conditions are favorable. Copper is effective for protecting a crop, but copper has been found to be ineffective when used as the sole practice for controlling late blight once it has started to develop. Other OMRI-listed fungicides labeled for late blight include Sporatec, Sonata, Serenade Max, and Companion. It is important to scout regularly and promptly destroy affected plants when found to reduce the amount of inoculum in a field. It is recommended that plants with symptoms be physically pulled up plus a few border plants, preferably on a bright sunny day when possible, then tarp the plants; spores will be killed by sunlight and also heat under the tarp. Scout daily thereafter for a few days to see if more plants develop symptoms. Clean after working in infested fields to avoid moving spores on equipment and workers. As soon as harvest is complete or the field is abandoned disk down field.

    The specific directions on fungicide labels must be adhered to. They supersede these recommendations (above), if there is a conflict. Check state registration and organic approval before using a product. Any reference to commercial products, trade or brand names is for information only; no endorsement is intended.

    Some of this information on management was provided by Dr. Steve Johnson, University of Maine Cooperative Extension, and Dr. Tom Zitter, Cornell University.
  2. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    Try Paul Sach's up at North Country organics, seranade is bacillus subtillis I believe
    Copper is very effective but also toxic to fish so be careful where you spray
    The first confirmed case of Late Blight in Washington DC happened last week
  3. White Gardens

    White Gardens LawnSite Fanatic
    Messages: 6,776

    Is Late Blight potentially devastating as some have predicted ???
  4. grandview (2006)

    grandview (2006) LawnSite Gold Member
    Messages: 3,465

    We are starting to get it here in the Buffalo area. It's also effecting potatoes to.

    This what caused the Great Potato Famine in Ireland .
  5. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    It is recommended to pull the plants immediately and burn them or lay them out under black plastic. If the spore is transfered over to the other plants they are goners too

    The spores travel on the wind and will infect entire areas
  6. White Gardens

    White Gardens LawnSite Fanatic
    Messages: 6,776

    So are any grain crops affected by late blight ???
  7. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    Phytophthora infestans is a big bummer, there was actually a grower out of Alabama that produces tomato sets for retail, they have just pulled over 1 million plants back that became infested from their greenhouses

    here is an article on it

    Our NPP product is very effective on P. Infestans if you would like the data send me an email. There are a lot of eyes on here that would also like the information and I would rather not give it to them, they are called competitors. It will be labeled for its use next spring, fingers crossed
  8. Grohorganic

    Grohorganic LawnSite Member
    Messages: 157

    `oh jah, why in the world are we still in a popular war advantage mode with organics???? tricoderma is parasitic to pythoria. so fill the vacuum with competition............
  9. turf hokie

    turf hokie LawnSite Silver Member
    Messages: 2,753

    Thanks for the replies and great information.

    An executive decision was made and the plants will be pulled and burned in the AM. It was decided better to lose this years plants, rather than fight the disease, eventually lose and take the chance of it overwintering and losing again next year.

    The plants will be rotated even though it is a small area, we figure best to get them away from where the are currently planted.

    Thanks again for the help
  10. Tim Wilson

    Tim Wilson LawnSite Senior Member
    Messages: 795

    I'm not sure what instructions are on trichoderma harzainum products but I had some ages ago which instructed using the dry spores on the plant. It is better if you grow out the sprouts a little first in a bucket of water with some molasses (probably 2 tablespoons in 5 gallons). Give it 18 to 24 hrs, then spray on the plants.

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