why do my rose leaves turn yellow

Warm, dry summers are ideal habitats for spider mites, which pierce the leaves of rose bushes and other plants, inject their saliva and feed. This leaves chlorotic spots, which eventually turn leaves yellow. Though they're extremely tiny -- just 1/16 inch -- you can spot them if you look carefully on the undersides of leaves.

In general, leaves that look dusty, stippled, and yellow to bronze are likely affected by mites. To prevent or get rid of spider mites, perform regular overhead watering in the mornings, as this knocks off spider mites and keeps the plant well-watered in the dry weather that attracts the critters.

You can also apply a miticide, along with the regular washing with water.
Taking immediate action to correct chlorotic conditions is important for in rose bushes.

After determining the chlorosis' cause is lack of oxygen from overwatering or poor drainage, alter your watering schedule and, if necessary, take measures to improve soil aeration or drainage.

To determine a watering schedule, wait until the roses droop, water heavily, mark the date and allow the roses to droop again before watering. Once the roses droop, you have gone one day too long without watering them.

Improving soil aeration or drainage may mean moving your rose bushes. The best time to move them is during their dormant period, winter. In the meantime, use a manual lawn aerator to create pathways to their roots.

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