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Oregano leaf tips turning brown/black

Posted by newtogardening_2008 VA (My Page) on
Mon, Jun 23, 08 at 11:50

Don't know what to do: my oregano has been growing beautifully, but this past week I've seen almost all the leaf tips turn brownish-black, and then the brown/black color spreads inward until they completely die and fall off. I had tried to get rid of all the affected leaves, but I'd come back later that same day and even more leaves would have it.

What is it? Do I just toss the plant at this point? Can I salvage it? I've moved it a yard away from my other potted herbs.


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RE: Oregano leaf tips turning brown/black

It could be most anything, from an overcrowded pot to too much watering. Try and think back the past few weeks and recall of any fertlizers or sprays were used on it. If its indoors, it may need more sunlight. If its bugs, you may see tiny black gnats that are called fungus gnats and these can destroy plants, as well as infect every single plant indoors our outside. One way to know if its the gnats is to use yellow sticky traps and set one horizontally on the edge of the pot. Wait several hours, and if you see tiny flies stuck there, you have the gnats. My garden suffers from these as well, so I use either a Bt product to kill the maggots they produce (feed on the roots!), and also beneficial nematodes. It can also come from any soil you use as well as reused pots that are not sterilzed, and could even be in indoor plants right now. Oregano is one herb that doesn't like fertilizers and too much water. If its gnats, they can fly throughout the whole house and infest every single indoor plant too!


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