According to seasonal patterns, when does chigger activity increase significantly?

Answer

When temperatures consistently rise above $70^{\circ} ext{F}$ ($21^{\circ} ext{C}$)

Chigger activity flourishes in warm, humid conditions, and their peak activity occurs from late spring through the heat of the summer and into early fall, with activity increasing significantly when temperatures rise above $70^{\circ} ext{F}$ ($21^{\circ} ext{C}$).

According to seasonal patterns, when does chigger activity increase significantly?
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