I suspect this is some sort of fungal growth. Does anyone know how to rid them of this. The leaves are starting to look dried up.
2007-09-16 14:48:08 · 4 answers · asked by E P 1 in Home & Garden ➔ Garden & Landscape
Sounds like powdery mildew, which is fairly benign this late in the season. Generally, good growing conditions keep the rose well ahead of the fungus.
It can be prevented but not treated...
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7463.html
2007-09-16 14:58:19 · answer #1 · answered by Anonymous · 3⤊ 0⤋
Yes, it is indeed a fungal growth, and it can get bad enough to keep your roses from getting adequate light to the leaf surfaces. You need to get a fungicide to spray onto them; it would also be a good idea to get a systemic fungicide to put into the ground for your rose bushes to take up into their tissues - sort of IV medication for plants. Check with a nursery near you to see what is available.
Good luck!
2007-09-16 17:10:51 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It's called powdery mildew. Just make a solution of 1part skim milk to 9 parts water and spray on your plants making sure to get tops and bottoms of leaves, canes, and trunk.
spray weekly.
"To control minor infestations, pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash... mix 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain. Spraying leaves with baking soda (1 teaspoon in 1 quart water) raises the pH, creating an inhospitable environment for powdery mildew."
http://www.organicgardening.com/feature/0,7518,s-2-9-894,00.html
"Scientist aren't 100% sure how milk works to control this disease. It seems that milk is a natural germicide. In addition, it contains several naturally occurring salts and amino acids that are taken up by the plant. From previous experiments using sodium bicarbonate, potassium phosphate, and other salts, researchers have found that the disease is sensitive to these salts. It is possible then, that milk boosts the plant's immune system to prevent the disease."
http://www.allthatwomenwant.com/milkandmildew.htm
Obviously there is a critic who does not approve of the organic way of controlling powdery mildew. However, thumbs down aside, It really does work.
Good Luck
2007-09-16 15:00:05 · answer #3 · answered by Sptfyr 7 · 1⤊ 2⤋
That is powdery mildew, yes a fungus.
http://plantclinic.cornell.edu/FactSheets/powdery/powdery.htm
This info may help.
2007-09-16 15:01:05 · answer #4 · answered by character 5 · 2⤊ 0⤋