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1 January 2001 Cold Hardiness Characteristics in a Strain of the Predatory Mite Euseius ( Amblyseius ) finlandicus (Acari: Phytoseiidae) from Northern Greece
G. D. Broufas, D. S. Koveos
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Abstract

The supercooling points (SCP) of immature stages and adults as well as survival of adult females after exposure to subzero temperatures were studied in a strain of the predatory mite Euseius finlandicus (Oudemans) from northern Greece. The mean SCP of eggs was −27.6°C. The mean SCPs of different immature stages fed on pollens of Papaver rhoeas L. or Typha sp. enriched with β-carotene were similar and varied from −21.1 to −24.7°C. The mean SCPs of diapause females acclimated for 2 wk at 5°C or not acclimated, nondiapause females and males fed on pollens of P. rhoeas and Typha sp. were similar and varied from −22 to −24.3°C. When groups of diapause females were exposed temporarily to different subzero temperatures, the temperature-mortality curve followed the distribution of the SCPs, which indicates that the SCP is the lower limit of survival. More than 80% of the diapause females died when exposed for 20 min to −15°C, a temperature well above the SCP which indicates that they suffered prefreeze mortality. They survived considerably longer durations of exposure to −15°C after a prior acclimation for 2 wk at different low temperatures. After certain acclimation treatments, diapause females that survived exposure to −15°C laid a similar number of viable eggs as those not exposed to subzero temperatures, which indicates that cold stress may not affect fecundity.

G. D. Broufas and D. S. Koveos "Cold Hardiness Characteristics in a Strain of the Predatory Mite Euseius ( Amblyseius ) finlandicus (Acari: Phytoseiidae) from Northern Greece," Annals of the Entomological Society of America 94(1), 82-90, (1 January 2001). https://doi.org/10.1603/0013-8746(2001)094[0082:CHCIAS]2.0.CO;2
Received: 27 December 1999; Accepted: 1 May 2000; Published: 1 January 2001
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KEYWORDS
cold hardiness
Euseius finlandicus
Phytoseiidae
supercooling
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