How to Kill Aphids on a Rose Bush

Roses are subject to a host of pests and diseases.

The most common insect pest on roses, aphids are small insects that suck sap from their host plants. Aphids prefer fast-growing plants with tender shoots and buds. Although a low to moderate infestation of aphids will not damage a rosebush, high infestations produce the aphid trademark sticky honeydew, which can cause the growth of black mold on rosebush leaves.

Things You'll Need

• Insecticidal soap or neem oil
• Garden sprayer

Instructions

1. Add insecticidal soap or neem oil to a garden sprayer. Follow manufacturer instructions on the label.

2. Spray the rosebush with the soap or oil solution. Thoroughly cover all surfaces of the plant, including the stems, buds, and undersides of leaves.

3. Spray the rosebush in exactly the same manner seven to 10 days later, to ensure the aphids are completely eradicated.

Tips & Warnings

• For a minor infestation of aphids, a strong spray with a hose-end nozzle will knock the bugs off the plant and may be sufficient to remedy the problem without chemicals.

References

• UC IPM Online; Roses: Insect and Mite Pests and Beneficials; M. L. Flint, et al.; September 2008