|What causes the leaf's to turn yellow on my Rose's. How do I trat it other than picking them off the and I have been putting them into a ziplock bag and throw it away. I also get Jappanees Beatles and spray for them along with picking them off and put them into a jar with alchaol. I have got the people on my street to stop putting up those horrid beattle bags because I think they attract them and have informed them to use Milky Spores. But they will not do this as I have.
Any help would be grateful. Thank You.
|Milky spore disease infects the grubs while they are in the soil so it will not stop adult beetles which fly in. It needs to be applied over a large area (contiguous acres) and be allowed a number of years to take full effect. Once applied, it remains effective for years. For a more immediate result on your roses (a Japanese beetle favorite) you might consider using Neem applied according to the label instructions.
Yellowing leaves can be caused by lots of things. Heat stress, water stress (either too much or too little), lack of fertilizer, diseases and insect feeding. There are several sprays on the market especially for roses but you'll need to figure out whether the problem is cultural, a disease, or caused by insect feeding.
Best wishes with your roses!