Parasitic Algae??

Discussion in 'THE CROTON SOCIETY' started by Bullwinkle, Nov 9, 2015.

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  1. Bullwinkle

    Bullwinkle Esteemed Member

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    1,460
    Location:
    DAVIE FL
    Keith called me to say that anyone who bought plants from him should watch out for any strange leaf spots for anyone who bought plants from him.He sprayed his plants twice before the sale but he wants everyone to be on the lookout.He will add some more info to this thread .
     
  2. keith

    keith Active Member

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    150
    Has anyone ever had an parasitic algae? its starts off from small brownish spot and gets bigger, kinda of transparent. When I first notice the problem I sprayed the plant with liquid copper and took some leaves to the agriculture extension service. The leaves that I sprayed the algae was dead. At that time the lady told me it was a fungus. So, I checked the plants I took to the sale and seen nothing on them. [ plants were sprayed twice with liquid copper ] a few days later I noticed it on more plants, so I went back to the ag station and had someone else look at it. This time there was a white mildew looking spot on the leaf. The lady in charge said I had an parasitic algae with a secondary fungus. She told me to keep spraying with liquid copper. She said it was because we had a very wet summer. so, anyone that got one of my plants should keep it away from other plants and spray again with liquid copper. I have never heard of a parasitic algae, has anyone else ever had this problem?
     
  3. Phil Stager

    Phil Stager Well-Known Member

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    1,650
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    Sunny St. Pete, FL
    Google the term parasitic algae and you'll learn more than you care to but did not see anything on treatments on a quick first pass. Appreciate the heads up, Keith.
    Getting into some deep fog here....
     
  4. junglegal

    junglegal Esteemed Member

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    Thanks Keith. Please post pics when you can. Is this only presenting itself on crotons?
     
  5. Moose

    Moose Esteemed Member

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    I'd use some caution with the copper fungicide Keith. It is an essential micro nutrient that is needed in small quantities. Over use can cause a copper toxicity in your plants.
     
  6. palmisland

    palmisland Well-Known Member

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    Will the copper kill scale?
     
  7. Phil Stager

    Phil Stager Well-Known Member

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    Cephaleuros sp. is the culprit after some more Google searching but only one paper of several mentioned any control and that was a Bordeaux solution (or a copper fungicide). No mention anywhere of the use of any other fungicides like Daconil. Copper will probably NOT kill scale insects; the mature scale insects need to be smothered by an oil whereas the little buggers or juveniles can be killed by contact insecticides.
     
  8. annafl

    annafl Esteemed Member

    Keith, the plant I got from you looks great. No evidence of anything other than beauty! Thanks again. I love it. Ana
     
  9. keith

    keith Active Member

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    150
    I will try to send Mike some pics tomorrow so he can post them for me. Man, where did this come from, If Id had known this was possible I would have sprayed often. Ron, I hear what your saying about copper toxicity, but by the time I done, you will be able to mine copper out of my yard. I know its not the right time of year to do this, but Im going to cut back 75 percent of my crotons down to bare stalks. I dont see any other way. I wouldnt be able to hit every spot on the leaves.
     
  10. Bullwinkle

    Bullwinkle Esteemed Member

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    keith.jpg keith.jpg keith2.jpg Keith sent me a couple of examples of the leaves with the algae
     
  11. Phil Stager

    Phil Stager Well-Known Member

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    ooooo - now that's ugly! looks like some spider mite damage on bottom of leaf also
     
  12. keith

    keith Active Member

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    150
    Im still at a loss about this, I know it was a wet summer, but I have been thru wet summers in years past but never had this problem. Never knew there was such a thing as an parasitic algae. Ive heard of a parasitic fungus, its in alot of croton collections. [ its about the size of a bb, but can be larger, round brownish in color ] Marie, Jeff, Kurt , have you seen this before.
     
  13. annafl

    annafl Esteemed Member

    Keith, don't do anything drastic. It's probably more cosmetic than anything. Besides, we're about to head into the dry season, so it may become history before long. Don't water at night, only in the morning so the leaves don't stay wet overnight. I bet it will take care of itself. Don't worry yet and don't do anything drastic!
     
  14. junglegal

    junglegal Esteemed Member

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    St. Pete FL
    It almost looks like the rust fungus on plumeria
     
  15. Native son

    Native son Well-Known Member

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    10a
    I know this sounds simplistic but the heavy soap and water in a spray bottle allpication still works for me. Our dry summer has kicked my behind with scale and all the above.
     
  16. Native son

    Native son Well-Known Member

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    Application works better
     
  17. Moose

    Moose Esteemed Member

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    I'm with Ana. Why would you cut off the organs that produce carbohydrates right before the cold sets in. Stop beating yourself up, from what I've been reading plants almost always grow out of it. They outlive the life cycle of the offending malady.
     
  18. keith

    keith Active Member

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    150
    Marie told me to call the Fl. dept. of ag., so I did. I talked to a plant pathologist and I had him pull up these pics on the forum. He said hes 95% sure - just from looking at the pics it is cepahaleuros virescens. He said to call it a parasitic algae was pushing it a little. He said Magnolias planted in their parking lot have it. HE said a copper based product should kill it. He said once its on the leaf , it pretty much stays there. Even though it may dry out this winter, once it gets wet it may pop back to life. So, IF I understand this, I will have to hit every spot of this with repeated applications of copper to get rid of it. So, I think my best bet is to do what I had planned and cut everything infected down to bare stalks and go from there. Let my hard lesson be of help to all you croton lovers- use copper in your spraying program as a preventative.
     
  19. Phil Stager

    Phil Stager Well-Known Member

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    Whatever you decide to do, keep us posted in this thread. have you considered cutting back one bead and just treating with Cu another one (not too close) - a controlled experiment of sorts.
     
  20. Moose

    Moose Esteemed Member

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    It ain't cheap but Clearys 3336 is a contact / systemic fungicide that may be a viable option. Kill the algae not the leaves.
     
  21. Phil Stager

    Phil Stager Well-Known Member

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    http://lee.ifas.ufl.edu/Hort/GardenPubsAZ/Algal_Leaf_Spot.pdf This paper has a bit more info on treatments, i.e, copper hydroxide fungicides like Kocide. Best to read the label on any fungicide, insecticide, etc. to see if it is any good or applicable to the plant disease or pest - unless one likes running possibly terminal experiments ... Blue copper and Bordeaux mixtures are primarily copper sulfate.
     
  22. keith

    keith Active Member

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    150
    Almost done- by tomorrow my whole shade house will be defoliated, nothing but bare stalks left- on to the next infected area of my yard.
     
  23. Kipjanet

    Kipjanet Active Member

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    Location:
    Zone 10 Miami Springs, Fl
    Keith thanks for the pictures posted by Bullwinkle please keep us in the loop and let us know what you use for control and your progress
     
  24. Marie Nock

    Marie Nock Well-Known Member

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    Keith, would you be able to dip/submerge your smaller potted plants? That would assure that every surface was treated.
     
  25. keith

    keith Active Member

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    Its pretty much on the bigger stuff,I wouldnt be able to dip them. While I was at the store buying liquid copper, I noticed Bayer had a product called moss and algae killer. I thought I might try this also, because the ag. guy said copper or anything that had an algaecide in it. It also is used to kill lichens, and I have been looking for something like that. Has anyone used this product before on or around crotons? I may spray it on some this weekend to see if they can take it. Yesterday I sprayed Tilex straight from the bottle on some and I dont see any damage, much to my surprise.
     
  26. kwtimo

    kwtimo Well-Known Member

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    586
    Location:
    key west, fl 10b-11
    Keith, I've had great success with hydrogen peroxide as a contact kill for fungus, mold and algae alike.
     
  27. keith

    keith Active Member

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    150
    I asked Perry about this the other day. How do you mix yours for spraying crotons?
     
  28. junglegal

    junglegal Esteemed Member

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    Search 'peroxide' keyword on this site and it will bring up Perry's article he posted. Good info from him & Mark!
     
  29. kwtimo

    kwtimo Well-Known Member

    Messages:
    586
    Location:
    key west, fl 10b-11
    If you use the store brand stuff, use it full stength. If you use a concentrated 35% like I do, dilute 10-12 oz per gallon
     
  30. Moose

    Moose Esteemed Member

    Messages:
    7,952
    Location:
    Coral Gables, FL Zone 10b
    Keith - what's happening with your crotons ?
     
  31. keith

    keith Active Member

    Messages:
    150
    I should have a croton society meeting at my house now. Colorful leaves are overated, you can come and see the natural beauty of bare stalks. I defoliated about 250 -300 plants. I have went thru 4 or 5 bottles of copper spraying the ones I didnt strip down. Its strange to me that no one at my extension service has heard of or dealt with this problem before. I was told it was cepahaleuros virescens by an ag. pathologist from the Fl. dept. of ag. [ he pulled up pics off this site] Its hard to get an ag. agent to come to your house, but the guy from my extension office said he would send someone to my house to collect samples and send them off to get a positive diagnosis. So, I will spray every 2 weeks with copper until I get rid of this- or until I or my crotons die from copper poison.
     

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