Re: link to bug, need id please

Donna,
This looks like more aphid stages to me, also. To be sure, though, you could take an assortment of leaves and pests, or a plant or two, to your local ag. extension service office or a local nursery with knowledgeable staff for an ID and recommendations for treatment.
To clarify (thanks, Doug :-) ) using sprays in the sun, I was trying to say it's better to spray in low intensity light conditions (such as cloudy, early morning or evening) to avoid leaf burn, especially when using oil based products, including the fatty acids of insecticidal soap. It is important, in any case, to read and follow the directions on label for the product you chose.

Doug Green wrote:

http://www.illianagardenpond.org/rudbeckiahirtaleaf.jpg

Sorry for the cross posting, but I am desperate. I found this bug
problem is more wide spread than I originally thought as I am going thru
the pictures.:(

This link is definitely (imho anyway) to an aphid. The white detritus looks a little small for adult whitefly but ... (I've been wrong before) :-)

My experience in greenhouses says pretty much the same thing as most of the others - insecticidal soap, sticky traps - will work equally well on aphids and most species of whitefly. I did have success with biologicals in my greenhouses but in order to do this, you have to have a full plan in place. They do not work as a spray - ie. see a problem- release the predators - eliminate the problem. Biologicals work nicely when incorporated into the management of the greenhouse on an ongoing basis.

Someone did write not to spray when the sun was shining and I'm not sure why this is so. I confess the only time I ever sprayed was when the sun was shining so I could see the plants and problems. :-)) There is an old wives tale about not putting water onto leaves because the light refraction will burn the leaves but the light refraction through water droplets is at the wrong angles to do this. The only "burning" I ever saw was from when I mixed the soap too strong or hit the wrong plants. If I'm missing something here, I'm sure the list will again point me in the right direction. :-)

Doug

Doug Green
Author of the award winning "Gardening Wisdom"
Free gardening newsletter at www.gardening-tips-perennials.com

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