Monday, June 6th, 2011...12:00 am

Two Knock Out Rose Problems


Sawfly by Mean and Pinchy

TheGardenLady received two questions from two people who were having problems with knock out roses.  Here is the first question.

I am very upset with my knock out roses. They have small green worms covering the leafs and eating holes in them. They also get on the perennial hibiscus. Is there anything I can use to get rid of the pest without using pesticides.

Here is an answer to this problem from the Knock Out Rose people:

Sounds like Rose slug or sawfly – they usually hang out on the underside of the foliage. You may want to try hand picking them off as you see them or try spraying a horticultural oil or a soap and water solution to suffocate the worms.

Here is the second question.

This is the second year for my roses. I have just had a few blooms to open but I have noticeable problems with them. Most of the leaves have very small holes and it seems like the blooms are smaller and ligher in color than last year’s. The leave problem is also on my older roses. I have treated them once with a spray of 1 tsp. each of baking soda, insecticical soap and horticultural oil in a qt. of water. I do not see any insects on either side of the leaves. Can you tell what the problem may be and how to help fix it?

Here is an answer to this problem from the Knock Out Rose people:

It sounds like your roses may be affected by rose slug or sawfly. The larvae is small and typically green in color (they usually hang out on the underside of the foliage; and are sometimes very hard to detect) They are usually a problem in early spring. It sounds like the treatment you are using is appropriate & it should work to help control the problem.


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