I've had this problem with my roses this year. Fromeverything I've read the best remedy seems to be the hose. Spray your plants from the bottom up and under the leaves with a strong spray once or twice a day for a few days, you should see an improve ment. You can also try a 3% soap spray. Put 5 Tbls of liquid dish soap (not antibacterial or bleach added) in a gallon of water. mix. put in a spray bottle and spray your plants. Don't forget under the leaves.