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Title

COLD HARDINESS STRATEGY IN FIELD COLLECTED LARVAE OF SCROBIPALPA OCELLATELLA (LEPIDOPTERA: GELECHIIDAE)

Writers

GANJI Z. | MOHARRAMIPOUR S.

Pages

 Start Page 287 | End Page 296

Abstract

 The beet moth, Scrobipalpa ocellatella is recognized as a widespread agricultural pest. COLD HARDINESS strategy of the beet moth larvae was investigated through monitoring seasonal changes at SUPERCOOLING POINTs and LOWER LETHAL TEMPERATUREs. Furthermore, the role of microhabitat in winter survival was studied. The mean SCPs of the last instar larvae was not significantly different from November 2010 to April 2011. Mean INOCULATIVE FREEZING POINT(-8.0±1.44oC) of the last instar larvae was significantly higher than mean SCP (-14.9± 0.93oC). The COLD HARDINESSof the pest shows seasonal fluctuation in response to reduction of air temperature. A 50% mortality (LT50) occurred at -11oC in November and -14oC in January and reduced to -18oC in February and finally increased to -14.5oC in April.Glycerol, sorbitol, trehalose, and myo-inositol were identified components in whole body extracts of S. ocellatella larvae. However, total cryoprotectants could not have significant effects on the cold tolerance. Larvae of S. ocellatella could tolerate subzero temperatures near their SCPs. Our findings show that beet moth larvae utilize moderately chilltolerance strategy during winter.

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