ugh,dead maples

Discussion in 'Maples' started by paxi, Jul 17, 2011.

  1. paxi

    paxi Active Member

    Messages:
    389
    Likes Received:
    1
    Location:
    St. Louis
    well, this is a new one for me. Looked at the underside of some branches on several maples and found a nasty surprise. The branches looked they have been filleted from the underside. Brittle even though leaves look fine. Definitely going to be some big time dieback and probably some lost. I assume this is some sort of sunscorch as we are in the midst of a nasty heatwave and the worst damage is in areas that receive the most afternoon sun (but actually little wind). The things that surprises me are:
    1) the damage is on the underside, not the sun exposed side 2) We have hot summers every year here in st. louis, but this is the first I have seen of this (although I have only grown JMs for 4 years) 3) little leaf burn

    Any thoughts? Suggestions?
     

    Attached Files:

  2. Kaitain4

    Kaitain4 Well-Known Member Maple Society 10 Years

    Messages:
    1,160
    Likes Received:
    11
    Location:
    Dickson, TN
    Unusual. I wonder if it could be Cicada damage? Did you have a large outbreak this year? I know they slit the bark on tender branches and lay their eggs inside.
     
  3. paxi

    paxi Active Member

    Messages:
    389
    Likes Received:
    1
    Location:
    St. Louis
  4. Kaitain4

    Kaitain4 Well-Known Member Maple Society 10 Years

    Messages:
    1,160
    Likes Received:
    11
    Location:
    Dickson, TN
    Not sure how to kill them. The eggs hatch underneath the bark and then the young grubs fall to the ground and burrow down for 13 years of feeding. I guess it would depend on which stage they are at if you can kill them or not.
     
  5. paxi

    paxi Active Member

    Messages:
    389
    Likes Received:
    1
    Location:
    St. Louis
    Nope, sorry, I was not clear. The cicadas are long gone (this is why I didn't initially put two and two together) and I suspect the nymphs already in ground. I was thinking of cutting of the branches not in an attempt kill the cicadas, but with the understanding that these branches would only die anyway and would like to avoid any secondary infection. I don't suppose anyone would recommend trying to treat the nymphs in ground (My gut tells me that would just be inviting trouble)?
     
  6. Kaitain4

    Kaitain4 Well-Known Member Maple Society 10 Years

    Messages:
    1,160
    Likes Received:
    11
    Location:
    Dickson, TN
    Evidently, once they get down to the tree roots there doesn't appear to be much you can do..

    Controlling Cicada Adults and Nymphs
    The best treatment for cicada damage is prevention. If your fruit trees are at risk, treating the bark with a liquid pesticide safe for food-producing trees can kill adult cicadas before they lay eggs. Reapply every 1-2 weeks, depending upon the pesticide used, and possibly more often in rainy weather. Try to treat only the young trees most at risk. Larger trees may see branch flagging due to cicada damage, but are unlikely to suffer severely.

    When cicada nymphs emerge from eggs and are ready to begin feeding on tree roots, they fall from their egg slits to the ground and burrow into soil. To prevent them from damaging roots and reducing growth rate, apply a pesticide labeled for cicadas in granule form to the soil surrounding any tree with egg slits or shed cicada skins on the trunk or branches. Before cicada nymphs reach your tree’s roots, they’ll contact the treated dirt and perish.
     

Share This Page