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black mold on cedars (5 Replies)

Posted November 1, 2016 at 11:37 am

i have been getting some, what looks like black mold on my cedars how do i get rid of this what is best spray to use, and what causes this, maybe not enough light to branch?

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Posted November 1, 2016 at 4:35 pm

Hi David, are you talking about Cedrus, Juniperus or Chamaecyparis of some sort? All three answer to common name, Cedar. Mold is typically a problem of low light and too much humidity. Even though it may be unsightly, I don’t think that it harms the plant. A picture would help . . .

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Posted November 1, 2016 at 5:48 pm

hey David they are cedrus Libani, Deodara, also noticed some aphid sprayed them with some neem oil seems to work, not alot humidity here in ca, could be more of a light issue, with thinning the dense areas should help. thanks

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Posted November 14, 2016 at 10:59 am

Yeah, David C. I think it is light. I’m more humid than you are (Sonoma County) but certainly not what anyone would consider humid, at least not during the summer months. The cedars generally do very well for us because they like our dry heat.

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Posted November 14, 2016 at 11:23 am

hi Sara, we get a few humid days up here in the hayward hills it is usually a few degrees cooler up here, i have a couple thousand trees in my nursery and they grow great up here, cedars and my bristlecone pines are my favorites.

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Posted November 20, 2016 at 5:40 pm

I love cedars and bristlecones, too!

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