What is this white stuff on my "new" tires?!

Common white substances found on plants

* Mealybugs: These small, white insects feed on plant sap and produce a waxy substance that can cover their bodies and the plant. Mealybugs can be treated with insecticidal soap or neem oil.

* Whiteflies: These tiny, white insects also feed on plant sap and can produce a waxy substance. Whiteflies can be treated with insecticidal soap or neem oil.

* Aphids: These small, green or black insects feed on plant sap and can produce a sticky substance called honeydew. Aphids can be treated with insecticidal soap or neem oil.

* Powdery mildew: This is a fungal disease that can cause white spots or powdery patches on leaves and stems. Powdery mildew can be treated with fungicides.

* Botrytis blight: This is a fungal disease that can cause gray or brown spots on leaves, stems, and flowers. Botrytis blight can be treated with fungicides.