When it comes to preventing infestation of susceptible trees and shrubs by borers, proper timing and the use of bark sprays with contact insecticides are key. There are several effective options available, including pyrethroids such as bifenthrin (sold under brand names like Onyx® and Talstar®) and permethrin (Astro®). These insecticides have been proven to work well against borers.
One important aspect to consider is the timing of the spray application. Borers are most active during certain times of the year, so it is crucial to apply the spray at the appropriate time to achieve the best results. Generally, the ideal time to spray for borers is during the early spring or late fall when the insects are most active and vulnerable. This timing ensures that the insecticide has the greatest impact on the borer population.
When using bark sprays with contact insecticides, it is important to follow the instructions provided by the manufacturer. This includes diluting the insecticide to the recommended concentration and applying it evenly to the bark of susceptible trees and shrubs. The goal is to create a barrier that will deter borers from infesting the plants.
Another option to consider is chlorantraniliprole (sold as Acelepryn), which is an effective and bee-friendly insecticide. This alternative may be preferred by those who are concerned about the impact of traditional insecticides on beneficial insects like bees. However, it is important to note that chlorantraniliprole may not be as readily available or widely used as the pyrethroids mentioned earlier.
In terms of personal experience, I have successfully used pyrethroid-based bark sprays to prevent borer infestations on my own trees and shrubs. By following the recommended timing and application techniques, I was able to effectively protect my plants from borers and maintain their health and vigor.
When it comes to spraying for borers, it is crucial to choose the right insecticide and apply it at the appropriate time. Pyrethroids such as bifenthrin and permethrin have been proven effective, but for those concerned about bee safety, chlorantraniliprole can be a suitable alternative. Following the instructions provided by the manufacturer and considering the specific needs of your plants will help ensure successful prevention of borer infestations.