What spray should be used on thujas for tick control? - briefly
Use an EPA‑registered, permethrin‑based horticultural spray labeled for arborvitae (Thuja) and effective against ticks, applied according to the product directions. Avoid oil‑based formulations, which can damage the foliage.
What spray should be used on thujas for tick control? - in detail
For effective tick management on arborvitae, select a product that is registered for both broad‑leaf ornamental use and tick control. The most reliable chemical options are synthetic pyrethroids, such as 0.5 % permethrin or 0.25 % bifenthrin. These compounds provide rapid knock‑down of adult ticks and larvae, maintain activity for up to four weeks, and are approved for application on coniferous shrubs when used according to label directions.
If a less persistent approach is preferred, carbaryl (1 % suspension concentrate) offers a shorter residual period (approximately two weeks) and is also labeled for ornamental use. For organic‑oriented programs, neem oil (5 % seed extract) or a blend of essential oils containing rosemary, clove, and cedar can reduce tick activity, though efficacy is modest and re‑application is required every 7–10 days.
Key application guidelines:
- Apply in the early morning or late evening when foliage is dry.
- Use a calibrated sprayer to deliver 1 – 1.5 qt of solution per 100 sq ft of foliage.
- Treat the entire crown, including the undersides of branches, where ticks commonly quest.
- Observe a pre‑harvest interval of at least 14 days for pyrethroids and 7 days for carbaryl; organic sprays have no statutory interval but should be cleared before mowing or pruning.
- Wear protective gloves, goggles, and long sleeves; avoid drift onto non‑target plants.
Re‑treatment is necessary when new tick pressure is observed or after heavy rain exceeding 0.5 in. Monitoring with a tick drag or visual inspection of foliage every two weeks will inform the timing of subsequent applications.