Diagnosing Twisted, Stunted Rose Leaves: Virus vs. Herbicide Injury

If roses in one bed have tiny, twisted leaves while others 15 feet away are normal, the cause is likely either rose rosette virus (which causes mottled coloration) or herbicide drift (which causes stunting and twisting). Examine the pattern: virus symptoms are often irregular; herbicide damage appears more uniformly on exposed sides. Determining the exact cause may require lab testing.