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Variations in acaricidal effect of wettable sulfur on Tetranychus urticae (Acari: Tetranychidae): effect of temperature, humidity and life stage
Author(s) -
Auger Philippe,
Guichou Sabine,
Kreiter Serge
Publication year - 2003
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.665
Subject(s) - acari , tetranychus urticae , wettable powder , humidity , horticulture , stage (stratigraphy) , biology , pest analysis , botany , acaricide , toxicology , agronomy , pesticide , physics , paleontology , thermodynamics
Under laboratory conditions, the acaricidal effect of wettable sulfur is influenced by climatic conditions and the stage of development of Tetranychus urticae . Its ovicidal effect results from the combined action of temperature and relative humidity (RH). Wettable sulfur becomes effective at 27.5 °C and 75% RH. Beyond this threshold, the acaricidal effect increases with rising temperature or humidity, to become complete at a temperature of 35 °C and 90% RH. Within the range of temperatures and humidities 20 °C/30% RH and 35 °C/90% RH the mortality of immatures (from protonymphs to teleiochrysalis) was total. Under similar experimental conditions, females usually died before the end of the experiment. Temperature and relative humidity increased the adulticidal potential of wettable sulfur. The fecundity of the sulfur‐treated females and the viability of their progeny was found to depend on temperature and RH. According to the same climatic conditions, eggs were less susceptible than females, which were in turn less susceptible than juvenile stages. Copyright © 2003 Society of Chemical Industry