Jul 21, Summer leaf drop on roses is perfectly normal. Happens all the time. It’s just that with the temperatures we are getting it’s more pronounced this year. In my experience roses are not happy campers when the mercury soars.
Most plants aren’t. When it gets this hot roses enter a semi-dormant state not unlike when winter comes stumpgrind.buzzted Reading Time: 6 mins. A plant with droopy leaves probably is not getting enough water. Too much water also makes a rose bush wilt, but yellowing and dropping of the leaves. Rose diseases that cause leaves to fall off are often signaled by spotting, deformation or other changes in the leaves. Roses are susceptible to fungal diseases, which can cause defoliation.
Pests are common causes of leaf drop.
Some leaves show the signs of specific pests. Dropped leaves that have notches taken out are due to earwigs or cutworms. May 29, 5. Watering - too much or too little. Roses love water, but not too much. Too much water drowns the plants - depriving the roots of oxygen.
And increasing the risk of rot. Too little water causes severe stress and force the plants into dormancy by dropping it's leaves. Worse, the roots could dry up completely and the roses would die.