pest or disease?

rogerydhOctober 29, 2011

Hi all,

Thank you for your replies.

I apologize for the bad photo posted. Please see my new posting, as picture attachments are not allowed in followup replies.

The picture is the underside of a fallen leaf. I have more pictures but it seems I am limited to one picture upload?

Thanks in advance!

Image link:

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Kimmsr(4a/5b-MI)

Do you find these just on the plant leaves or are they also on the plant stems?

    Bookmark   October 29, 2011 at 6:57AM
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ronalawn82(z9FL)

rogerydh, towards the bottom of the leaf, along the midrib, there is a brown spot which reminds me of a scale insect. I found a picture of similar on this site.
http://www.freshfromflorida.com/pi/enpp/ento/poliapsis_cycadis.html

    Bookmark   October 29, 2011 at 9:05AM
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rogerydh

@Kimmsr,

Yes. Its on the leaves and on the stems.

@ronalawn82,

I looked at the site and it does look like it. I am a total newbie to this. Does that mean its a pest called Scale? :)

Guess I will go get another type of pesticide.. :)

Thanks a million!

    Bookmark   October 31, 2011 at 7:50AM
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jean001a(Portland OR 7b)

If they're scale, that means nothing, short of physically rubbing them off, will work unless the recently hatched crawlers are moving.

If the rest of the plant is as heavily infested as the ONE leaf, then you would be wise to avoid pesticides and replace the plant.

    Bookmark   October 31, 2011 at 10:19AM
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Kimmsr(4a/5b-MI)

The most common method of control for scale is the use of a horticultural oil spray, a dormant oil when the plants are dormant or a superior oil during the growing season. Because these oils do kill insects they are pesticides but are usually distinguished from pesticides for more clarity. Most any pesticide you use could kill off the predators of scale, although I have seen some reports that Neem Oil products have helped control scale sometimes.

    Bookmark   November 1, 2011 at 7:10AM
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jean001a(Portland OR 7b)

Sprays against scale are effective when the crawlers (new hatchlings) are out & about.

    Bookmark   November 1, 2011 at 1:29PM
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IpmMan(5)

Oil does work against all stages of scale, though as Jean001a says it is most effective when the crawlers are active.
When I have a scale problem I usually Oil when I first see it, then when the crawlers hatch and again in the next spring and or fall. This almost always gets me 100% control.
Remember though that oil has to cover completely to control anything.

    Bookmark   November 2, 2011 at 10:13AM
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ronalawn82(z9FL)

rogerydh, try this site. Look especially at Control Methods at the end of the document.
http://entnemdept.ufl.edu/fasulo/woodypest/scales.htm
Come back if you need additional information.

    Bookmark   November 2, 2011 at 11:06AM
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JustinDavidson

Here is another site with info on scales, you can also id other common insects www.bugsinthegarden.com

Here is a link that might be useful: Bugs in the Garden

    Bookmark   November 14, 2011 at 9:11PM
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rhizo_1 (North AL) zone 7

Justin, I don't mean to be critical, but the information about scale insects in that website is limited in the extreme. So limited, in fact, that it is misleading.

I'm kinda scared to look at the other entries, if what is presented about scale is any example.

Ron's fact sheet is a good one and there are plenty of others like it published by every extension department in the country. Most of them are pretty darned good!

    Bookmark   November 18, 2011 at 6:41AM
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jean001a(Portland OR 7b)

Umm, I suspect Justin added that link because he's trying to promote it. He announced that fact in the post "Help!" at http://forums.gardenweb.com/forums/load/pests/msg11123400384.html

    Bookmark   November 18, 2011 at 7:51PM
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rhizo_1 (North AL) zone 7

UhOh

    Bookmark   November 19, 2011 at 5:38AM
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