Need help with pest control, black dots all over...

sarahkho(5)September 25, 2013

Hi everyone.

I noticed some strange things happening to my plants and it seems widespread. I already let go of my Bella plant because of some pest, spider mites IIRC, but it seems that another pest is attacking all my plants at the same time.

I uploaded some high resolution pictures and added the link so you could see them and kindly give me some advice whether these are some sort of pests and I should handle them or it is something entirely different.

When I touch under the leaves, the dots seems to be internal and not external, so I cannot remove them by washing the plants.

Thank you.

Here is a link that might be useful: High Resolution pictures of some infected plants

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puglvr1(9b central FL)

Not sure what the first one might be...but the second picture could be scale? Possibly the third picture "might" be black aphids?

Google and compare pictures to your pest...Good luck!!

Here is a link that might be useful: Picture of black aphids

    Bookmark   September 25, 2013 at 3:24PM
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mairzy_dotes(zone 10)

Maybe a fungus, especially if it doesn't wash off. However, the one picture looks like some bug has laid eggs in a cluster form. They may hatch into little worms. But if eggs, you would be able to scrape them off.

    Bookmark   September 25, 2013 at 11:57PM
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greedygh0st

Just so you know, a lot of Hoyas can develop black spots when kept in very strong light, and that is nothing to be worried about.

In this case, the spots are definitely problematic, because it is widespread and there is yellowing around them. I agree with mairzy that it looks fungal, or that at least this is a good starting diagnosis.

There are a lot of different ways you can treat such an infection. I'm not sure how widespread your situation is, but if possible it's always best to start with the gentlest treatment and work your way up, if needed.

You can begin with a natural remedy and make a paste out of cinnamon and water and smear it over both sides of the spots. The spots should 'dry up' and be more solidly black, with no more spread, if this works.

A harsher but stronger method is using chemicals, such as spraying the affected plants with a Physan 20 mixture (2t/g) or an alternate fungicide.

Another method frequently mentioned is to use athlete's foot spray. Some people just mist it in the air over the tops of their orchids and let it settle on the leaves. I've sprayed it directly on a Hoya leaf before and it didn't seem to cause any harm.

Good luck :\

    Bookmark   September 26, 2013 at 11:39AM
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