Stem borers bore into canes, lay eggs; larvae feed inside, killing canes. They don't eat leaves. Cut canes below damage; seal cuts with Elmer's glue to prevent re-entry.
Use Safer's Insecticidal Soap or homemade: 1 quart water + 1 tsp melted pure Ivory soap + few drops canola oil. Shake well. Systemic insecticides kill beneficial insects and birds that eat them.
Poplar Leaf Spots: Fungal Leaf Spot, Not Insects
Slug Damage on Young Sunflowers: Organic Control with Iron Phosphate
Leaves Growing on Phalaenopsis Spike: Keiki Basics
Leaf Tip Dieback in High-Altitude Roses: Frost, Fertilizer, or Mildew?
Knockout Rose Black Spot: Late Season Management in Zone 8
Whitefly on Miniature Roses: Identification & Complete Eradication
Diagnosing Abnormal Rose Leaves: Light Green, Narrow, Shriveled Clusters
Container Knockout Roses Losing Leaves: Heat Stress and Recovery
Why Are My Knockout Rose Leaves Turning Brown and Yellow in Tampa?
First-Time Rose Care: Yellow Leaves, Black Spot, and Recovery
Summer Defoliation: Humidity, Fungicide Gaps, and Foliar Feeding for Recovery
Almond Tree Leaves Skeletonized: Japanese Beetles
Gardenia Leaf Damage: Identifying Hidden Pests on Container Plants
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