Yellowing leaves on Hybrid Tea Rose Bush
It's hard to say for sure without seeing your plant, but hybrid tea roses such as Mr. Lincoln often get a disease called Black Spot. To combat this disease you need to spray your rose with a fungicide every 7 to 10 days through mid-summer. Also, remove all diseased foliage and branches and never water from above. It also helps to grow disease-reistant roses. Mr. Lincoln is a very old variety that has little disease resistance. Although the variety has pretty flowers, I don't recommend growing it anymore because there are many newer red roses that are more vigorous and easier to care for. "
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