Remember, weather can be on your side when dealing with aphids. Heat and high humidity can really knock them back as they are fairly fragile and die off in droves when temperatures are over 90°F.

Will cold temperatures kill aphids?

Insects that are freeze-avoidant can tolerate certain degree of chilling, but they die off when the temperature drops below the freezing points of their body fluids. ... Example of insects with freeze-avoidance that can be killed by freezing include pine beetles, adelgids, aphids, ticks, and emerald ash borers.

Do aphids stay in the soil over winter?

A generation of aphids survives the winter as eggs, which allows them to withstand extreme environmental conditions of temperature and moisture. ... All the aphids born from the winter eggs are females. Several more generations of female aphids are born during the spring and summer.