When are spruce spider mites most active?

When are spruce spider mites most active?

• A. Cool weather (spring and fall).
• B. Hot weather (mid-summer)
• C. Winter with freezing temperatures
• D. Nighttime hours only

Answer: (A)

Spruce spider mites are most active when conditions are cool and relatively dry, which you typically see in spring and fall. In these milder temperatures, mites can complete generations and feed on the needles without the stress of extreme heat or heavy rain, leading to noticeable feeding damage and population buildup. Hot midsummer weather often slows their activity and can stress trees, while winter freezes halt activity entirely. They don’t limit themselves to the night hours; they’ll move and feed during the day when the weather is favorable.

Spruce spider mites are most active when conditions are cool and relatively dry, which you typically see in spring and fall. In these milder temperatures, mites can complete generations and feed on the needles without the stress of extreme heat or heavy rain, leading to noticeable feeding damage and population buildup. Hot midsummer weather often slows their activity and can stress trees, while winter freezes halt activity entirely. They don’t limit themselves to the night hours; they’ll move and feed during the day when the weather is favorable.