Journal of Biological Control

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The effect of temperature on different Trichogramma spp. is an aspect to be understood for planning mass production strategies and further field releases. The key biological parameters of seven different spp./strains of trichogrammatids (viz. Trichogramma japonicum Ashmead, T. cordubensis Vargas and Carbello, T. achaeae Nagaraja and Nagarkatti, four strains of T. chilonis Ishii i.e. lab strain, Nilgiris strain, Kodaikanal strain and a strain acclimatized to constant 15°C) were investigated at five constant temperatures (16, 21, 26, 31 and 36±1°C with 60-70% RH and L: D-12:12). The different test temperatures had a significant impact on the biological parameters of the different species/strains. Based on longevity, parasitism and fecundity attributes, the best temperature to propagate these trichogrammatids was found to be 26°C. Considering the higher parasitism rates and the ability to parasitize and remain fecund at varied temperatures, T. chilonis Nilgiris strain proved to be the best. From the linear model of regression analysis, the upper temperature thresholds ranged from 35 to 46.37°C and the lower temperature thresholds were recorded to range between 9 and 12°C, with T. cordubensis appearing to be least temperature sensitive.

Keywords

Biology, Effect of Temperature, Trichogramma.
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