We want to thank the Colorado State University Extension , more particularly W.S. Cranshaw and B. Baxendale for putting together this report. W.S. Cranshaw, is an entomologist and professor, bioagricultural sciences and pest management at Colorado State University Extension; and B. Baxendale, is a professor in botany at Teikyo Loretto Heights University. Our next tips will be extracts from their report.
- Certain oils, diluted with water and applied as sprays, can be effective controls of many plant pests.
- Horticultural oils are usually highly refined petroleum oils combined with an emulsifiying agent. Some plant-derived oils also are used.
- Advantages of oils include safety, effectiveness and limited effects on beneficial insects.
- Do not use oils on certain sensitive plants. Plants under drought stress may have increased risk of injury.