The influence of temperature, humidity and simulated rain on the performance of thiameturon‐methyl

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Abstract
Summary: The influence of temperature, humidity and simulated rain on thiameturon‐methyl activity was examined on white mustard (Sinapis albaL.) plants grown in controlled environment cabinets or in a glasshouse. The performance of thiameturon‐methyl was markedly improved with increasing temperature and humidity. Addition of a non‐ionic surfactant increased the activity of thiameturon‐methyl, reduced the in fluence of humidity on herbicide performance but had no effect on the influence of tempera ture on herbicide activity. Increasing the amount of simulated rain from 0.11 to 3 mm reduced the activity of thiameturon‐methyl. However, reduction in activity by 3 mm rain became less pronounced as the interval between herbicide application and rain treatment was in creased from 0.5 to 6 h. With a 6‐h interval 3 mm rain had little effect. Rain intensity was found only to have a minor influence on the rainfast‐ness of thiameturon‐methyl.