DISEASES: Mildew, rust and black spot are the big 3 of rose foliage diseases. Mildew is a gray to white furry coating on leaves. Loves high humidity but needs dry leaves to grow on. Poor air circulation, such as crowded plants encourages mildew to grow.Rust usually appears first in late spring as bright orange spots underneath leaves.In severe cases, entire leaf may be covered with orange powder and leaves may fall off. May be spread easily and needs damp leaves to grow. Black spot is the most devastating of the three.It needs water to spread and overhead watering will spread it if the disease is present.
SOLUTIONS: For all three, the first thing to do is thoroughly clean up all dead leaves and debris from last season; Then before new growth begins, spray plants and soil with dormant season spray of oil or lime sulfur. This will destroy any leftover diseases that are lurking from last year waiting to reinfect; it will also get rid of insect eggs.
|Ladybug, Ladybug, fly away home...|
Well, that completes Rose School! Tomorrow we will explore the garden with some new photos to share!