Here, we give you a low-down on everything you need to know to save your trees from winter moths.
What are winter moths?
Winter moth treatment
- Insecticides: Insecticidal treatments can combat invasive pests depending on their current life stage. Homeowners can apply some varieties, but only a licensed pesticide applicator must use others. Treatments with insecticides containing spinosad, imidan, or Sevin® treats newly hatched caterpillars within 24 hours. Applying products containing Bacillus thuringiensis kurstaki, a relatively safe bacterium, on the leaves kills the caterpillars during the free-feeding stage. However, these products are most effective when the caterpillars are in the early-life stage.
- Physical barriers: Several products like sticky tapes, glues, oils, and grease, act as physical barriers between tree stems and caterpillars. But they are only effective before winter moth egg-laying begins.
Winter moth prevention
You can use horticultural oils; they work by suffocating the moths at the eggs stage. However, since the eggs are hidden within crevices, oil sprays achieve only limited results. You must leave the mixing of oils and chemicals to professional licensed applicators or arborists as wrong compounds can cause serious injury to plants, the environment, and the person using them.