Tree Care Glossary & Encyclopedia

A highly refined petroleum or plant-based oil sprayed on trees during dormancy to smother overwintering insects and mite eggs on bark surfaces.

A systemic insecticide from the avermectin class, delivered via trunk injection, that is the gold standard treatment for emerald ash borer and other wood-boring insects.

A chemical substance used to prevent, inhibit, or kill fungal pathogens that cause plant diseases.

A systemic neonicotinoid insecticide widely used in tree care to control sucking and boring insects, typically applied as a soil drench or trunk injection.

A chemical substance used to kill or repel insects that damage trees, applied through various methods including spraying, injection, or soil application.

A botanical insecticide and fungicide derived from the seeds of the neem tree (Azadirachta indica) that disrupts insect feeding and development.

A systemic triazole fungicide widely used in tree care to prevent and treat vascular and foliar fungal diseases, commonly applied via trunk injection.

A geographically defined area where the movement of regulated articles such as wood, plants, or soil is restricted to prevent the spread of a specific pest or disease.

A treatment method in which diluted pesticide or nutrient solution is poured onto the soil around a tree's base for uptake through the root system.

A method of delivering pesticides, nutrients, or growth regulators directly into a tree's vascular system through small holes drilled in the lower trunk.