Do you have a flatbed scanner? If so, you could scan those leaves, showing us the top side and underside of an affected leaf. OR maybe you can shoot more close up. I can see a discoloration, but not in enough detail even to guess at what it might be.

Jeri

Thanks Jeri. I don't have a scanner, but I clipped some leaves to get a better photograph of the front nd back. Here is the front:

And the back:

Could be the soapy water, residue smothering the leaf stoma. How soapy was it? What kind of soap?

Looks like soap damage to me. Often, sprays run down to the lowest points and pool. Let sunlight and heat hit and the chemicals in the soap, or fats in the insecticidal soap can burn the leaf. Kim

Yes. That'd be my guess.

I know one rose exhibitor who used dish soap and water one spring, and lost every bit of foliage. All burnt like that.

It's why I don't use dish soap, and don't use insecticidal soap. Oils will do that, too -- and I've seen it happen when the sun was intense, even in temps under 75 deg.

I've seen whitefly on rose foliage, btw, but not often, and not recently. They seem to pick one or two roses, but they prefer things like begonias or brugmansias -- or citrus. I've never seen them colonize roses.

You know, using any sort of insectide on whitefly is self-defeating. Their life-cycle is such that the die-off lasts only days, and a new generation hatches. And you kill beneficials. You might, instead, look for plants they ARE colonizing, and get rid of them there. Do you know what their "nests" look like? Little fuzzy white spirals underneath host leaves.

Jeri

I used about a teaspoon of Seventh Generation dish soap added to 32 oz of water. It also rained that afternoon, which would have washed any residue off. In the future, should I use less? Or rinse it off immediately?

Thanks, all. The major infestation was the leafhoppers-- they were incredibly thick on the plant. Next time I'll just use the hose to avoid soap damage (and the dreadful feelings of guilt).

Thanks, all. The major infestation was the leafhoppers-- they were incredibly thick on the plant. Next time I'll just use the hose to avoid soap damage (and the dreadful feelings of guilt).

Thanks, all. The major infestation was the leafhoppers-- they were incredibly thick on the plant. Next time I'll just use the hose to avoid soap damage (and the dreadful feelings of guilt).

Ack, I'm not sure why that posted so many times. Sorry for the triple post.

Use less? Truthfully? I wouldn't use it at all.

Jeri