Dormant oil is an effective treatment for protecting trees and shrubs from pests. This horticultural oil suffocates overwintering insects, reducing infestations without harming beneficial organisms. It's best applied in early spring, around March or April, before new growth begins. While you can apply it yourself, hiring professionals ensures proper timing, application, and plant care. Professionals bring expertise and a comprehensive approach that enhances the health and beauty of your landscape in Iowa.

What is dormant oil and how does it work?

Spraying dormant oil treatment on the leaves of a tree in Des Moines, IA.

Dormant oil, also known as horticultural oil, is a refined petroleum product that is emulsified with water and applied to trees and shrubs during their dormant season. This oil serves as a protective agent against a variety of pests, including aphids, mites, and scale insects, which can cause significant damage to plants if left unchecked. The application of dormant oil is particularly beneficial because it targets pests when they are most vulnerable, during their overwintering stages, before they become active and reproduce. By addressing the pest problem early, dormant oil helps prevent infestations from taking hold as the growing season begins.

The mechanism of dormant oil is straightforward yet effective. When applied, the oil coats the insects and their eggs, creating a suffocating barrier that disrupts their ability to breathe. This action effectively halts their life cycle, reducing their population and minimizing the risk of future infestations. Unlike chemical pesticides, dormant oil is considered more environmentally friendly, as it specifically targets harmful pests without affecting beneficial insects or the surrounding ecosystem. Its use helps maintain ecological balance in the garden while providing an effective solution to pest management.

When should dormant oil be applied on trees and shrubs?

Timing is crucial when applying dormant oil. The best time to apply it is in early spring, typically in March or April, when temperatures are above freezing but before new growth starts. This timing ensures that the oil targets overwintering pests without damaging tender new shoots or leaves.

Applying dormant oil at the right time helps maximize its effectiveness. If applied too early, the oil may not reach all the pests, while applying it too late can harm new growth. Monitoring weather conditions and plant development is essential to determine the optimal application window.

Applying dormant oil in early spring ensures it targets overwintering pests without damaging tender new shoots or leaves.

Why hire professionals for dormant oil application?

While applying dormant oil may seem straightforward, hiring professionals offers several advantages. Experienced arborists and horticulturists have the expertise to assess your landscape and determine the appropriate timing and concentration for application. They understand the specific needs of different plant species and can tailor the treatment accordingly.

Professionals also have access to high-quality dormant oils and equipment, ensuring thorough and even coverage. They are trained to apply the oil safely and effectively, minimizing the risk of damage to your plants or surrounding environment. Additionally, hiring experts can save you time and effort, allowing you to focus on other aspects of garden maintenance.

Give us a call today to sign up for our tree and shrub care program!

Dormant oil is an essential tool in maintaining the health and beauty of your trees and shrubs. Here at A+ Lawn & Landscape, we provide a tree and shrub care program for commercial and residential properties, as well as HOAs, in Des Moines, West Des Moines, Ankeny, IA, and neighboring areas. This program includes regular visits from March to November to apply fertilizers, dormant oil, disease control, iron injections, and treatments against pests such as Japanese beetles, bagworms, emerald ash borers, and more.

We've been helping property owners take care of their plants since 1988, helping their trees and shrubs stay healthy and protected from damage. With our experience and skill, you can rest easy knowing your plants are in safe hands. Call us today at (515) 289-2020 to schedule this service!