Canker on Tropical Hibiscus, plus fungus gnats?

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ppocket Bexley, OH(Zone 5b) Jul 03, 2006

If you have ANYTHING to enlighten me here, I'd thoroughly appreciate it. 3 of my cherished trees are in danger from this thing. Mucho thanks in advance for any responses!! Polly

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ecrane3 Dublin, CA(Zone 9a) Jul 03, 2006

I don't know anything about canker and can't really see much of anything in your picture, but the only time I've ever seen fungus gnats was in situations (usually seed starting) where I had too much moisture around. I don't think they harm the plants in any way, but they're a sign of other problems. If the canker is caused by fungus then that could be why they're around. Either way, I don't think you need to do anything specifically about the gnats, they should go away once the other problem is fixed.

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trackinsand mid central, FL(Zone 9a) Jul 04, 2006

your plants look pretty healthy to me. judging from the size of them, i would say they could use bigger pots and maybe a root pruning when you transplant. your picture doesn't show the bottoms but i'm hoping you don't have them sitting in saucers, that could be your problem.

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ceejaytown The Woodlands, TX(Zone 9a) Jul 05, 2006

And I'm trusting those very nice pots have good holes in the bottom? Can you get a close picture of the canker? Where is it located?

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