Andy D
Full Member
Posts: 43
Joined: Sun Sep 20, 2009 1:26 pm
Location: Minnesota

Disease???

One of my Japanese maples has little greenish black bumps(that can be rubbed off) on the underside of some of the leaves. what is it and how do i get rid of it. please help!!!
Andy

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Gnome
Mod
Posts: 5122
Joined: Wed Jul 05, 2006 12:17 am
Location: Western PA USDA Zone 6A

Andy,

little bumps that can be rubbed off sounds like scale insects. They might also be Aphids. If you have a hand lens you should be able to identify them. Aphids are obviously insects while scale are immobile lumps.

Your tree will be losing it's leaves soon. Perhaps you need not do anything other than destroy the fallen leaves so they do not reinfect your plant next spring. You could also try a dormant oil spray to kill any possible eggs that may be present.

Norm

nyther
Newly Registered
Posts: 2
Joined: Sun Jan 04, 2009 11:37 pm
Location: Texas

This sounds like scale. A bug that creates a hard shell around itself for protection. You can use an insecticidal soap or neem oil. I had many on a fukien tea and used rubbing alcohol on a swap and dabbed them with the alcohol. This will kill them instantly. Then I used insecticidal soap once a week until they were gone. This is necessary to kill the eggs and young scale that are hosting on bonsai. Hope this helps.

Ken

Andy D
Full Member
Posts: 43
Joined: Sun Sep 20, 2009 1:26 pm
Location: Minnesota

Thank you very much that helps a lot :D
Andy



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