Studies on Developing Races of Trichogramma australicum Girault Suitable for High Temperature - Low Humidity Conditions

C. C. ABRAHAM and S. PRADHAN

doi:https://doi.org/10.29321/MAJ.10.A03343

Madras Agricultural Journal

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Studies on Developing Races of Trichogramma australicum Girault Suitable for High Temperature - Low Humidity Conditions

Author: C. C. ABRAHAM and S. PRADHAN,

p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 63, Issue: aug-oct,

DOI:https://doi.org/10.29321/MAJ.10.A03343

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Abstract

Strains of Trichogramme australicum with tolerance to high temperatures (32-35 °C) could not be selected from heterogenous population of the parasite developed by inter- breeding cultures obtained from Ambajipet, Cuddalore. Delhi, Lucknow, Ludhiana and Mandys. The Ludhiana, Delhi and Ambajipet cultures were relatively more tolerant to high temperature (35° C)-low humidity (10% RH). Significant improvements in adult emer- gence, fecundity and progeny production were attained after rearing the Ludhiana and Delhi cultures for 32-33 generations at progessively increasing temperatures from 300 to 330 C and docrossing humidities from 60 to 10

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