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Burned Hydrangea

Discussion in 'Organic Lawn Care' started by DeepGreenLawn, Aug 30, 2008.

  1. DeepGreenLawn

    DeepGreenLawn LawnSite Silver Member
    Messages: 2,372

    OK, I don't know about the spelling for Hydrangea, but you get the idea.

    I was treating a lawn yesterday and just stopped to look at the bushes to make sure they were all good and not bugs/diseases.

    I found the hydrangeas, one group was bad, a nother group was getting there, had these what I would describe as burn spots. They looked just like someone took a lighter and held it under neath and made a burned circle, not all the way through, but just enough to get it black. Any thoughts? I didn't have my camera and the only thing I saw bug wise were these shiny green "flies" everywhere. Are they the culprit or is this a disease? Some spots were holes but most looked similar to a cigarette burn on a couch?
  2. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

  3. DeepGreenLawn

    DeepGreenLawn LawnSite Silver Member
    Messages: 2,372

    GREAT JOB! That is excatly what it looks like...

    Regular fungicide take care of this such as NPP?
  4. growingdeeprootsorganicly

    growingdeeprootsorganicly LawnSite Senior Member
    Messages: 766


    are they getting irrigated? too much maybe or wet leaves at night? hows the soil?
    or maybe insect damage?
    chitosan would not hurt i don't think? give it a try, maybe fertilize too

    need picture
  5. DeepGreenLawn

    DeepGreenLawn LawnSite Silver Member
    Messages: 2,372

    yeah, they are irrigated, there is a group that is a bad and a group that is just starting to be effected. Not bad though... this pic from the site kiril is basically identical to what I have seen other than the outer edge of the leaf. The spots are perfect...

    Attached Files:

  6. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    Anthracnose is one tough customer, we have had good responses from several trees (lilacs, dogwoods, crab apple) with the NPP. It elicits a SAR (systemic applied Resistance) response from the tree, often it will drop some leaves from the application, basically it puts the defense systems of the tree on high alert and begins producing hormones to protect it self

    Long term I am not sure how much you can do but try to keep an eye on them and provide help on a "as needed" basis. Good cultural practices are paramount to help the plant and try to get rid of the disease

    Anthracnose is wiping out all of the dogwoods in the mid atlantic, one DNR guy I talked to said in 20 years there will be no more dogwoods in the mid atlantic because of it. It is one tough cookie to deal with, often you have to pull the plant and start over

    I know it has taken about 15 in the woods in my back yard
  7. DeepGreenLawn

    DeepGreenLawn LawnSite Silver Member
    Messages: 2,372

    Keep it out of my area! Dogwoods are my favorite! Well, tied with cherries...
  8. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    My assumption on how it got there, if in fact that is what it is, is your 2 years of drought in your area and then all of a sudden you get 3 days of rain, lots of rain, it is the perfect set up for the stuff.

    Stressed plant and 3 days of rain, bingo

    You may have to pull a chemical trigger on this one. I am sure you will see more fungal pressure in others yards, the scenario is perfect for it. Almost the same story up here in the mid atlantic
  9. DeepGreenLawn

    DeepGreenLawn LawnSite Silver Member
    Messages: 2,372

    yeah, I just treated for fungus, me and a buddy were having a "discussion" of whether a fungus was really a fungus or just a lack of water/fert, etc. Well... I treated it like a fungus, dollar spot to be exact... and I found a neighbor with the same fungus in question. I actually talked with the neighbor to let them know that they had a fungus and they said they used TG, well... the yard I treated is back to normal, the neighbor, those "orangish" spots that I found to be the early stages of DS are not bleached white like some customers I have that I got to too late, ie, it was there when I got there. But those are starting to come back too, slowly, but they are coming back...

    as for the neighbor... I will be stopping by again to talk with them and see how they are liking their current service. :D
  10. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    dipotassium salts, phosphonite, then tea the heck out of it.

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