Effects of Different Constant Humidities and Temperatures on Twospotted Spider Mite Egg Hatch1

Abstract

A higher percentage of twospotted spider mite, Tetranychus urticae Koch, eggs hatch and the hours to 50% hatch is shorter at higher constant temperatures and humidities. Humidities with a saturation deficit (SD) from 5 mmHg to 40 mmHg were tested for temperatures of 25°, 30°, and 35°C.