Response of Trichogramma brassicae (Hym.: Trichogrammatidae) to temperature: Utilizing thermodynamic models to describe curvilinear development
Temperature has profound effects on biological efficiency of parasitoid wasps. In the present study, effects of seven constant temperatures (12, 15, 20, 25, 30, 32 and 35 ± 0.5 °C) on the pre-adult development of Trichogramma brassicae (Hymenoptera: Trichogrammatidae) were investigated on Sitotroga...
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| Published in: | Crop protection Vol. 143; p. 105562 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
01-05-2021
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Temperature has profound effects on biological efficiency of parasitoid wasps. In the present study, effects of seven constant temperatures (12, 15, 20, 25, 30, 32 and 35 ± 0.5 °C) on the pre-adult development of Trichogramma brassicae (Hymenoptera: Trichogrammatidae) were investigated on Sitotroga cerealella (Lepidoptera: Gelechiidae). Temperature effects on the emergence rate and sex ratio were also determined. The development rate of T. brassicae was described using two linear and twenty non-linear functions and critical bioclimatic temperatures (i.e., Tmin, Topt, Tmax and k) were estimated. Efficiency of models was assessed by different criteria (i.e., R2, R2adj, SSE, AIC, AICc, BIC and zi). Rate of development increased from 12 to 30 °C but decreased at two higher temperatures (i.e., 32 and 35 °C). At all thermal regimes a higher number of female individuals was emerged than males (1.81, 2.23, 2.03, 1.44, 1.78 and 1.78 ♀: ♂, respectively). At 12 °C, the lowest rate of parasitoid emergence (9%) was observed. The lower threshold predicted by the two linear models were 8.13 (Ordinary regression method) and 8.36 °C (Ikemoto method). These models predicted the thermal constant for pre-adult development as 181 and 177 DD, respectively. The estimates of optimum temperature ranged from 30 to 32 °C with an upper threshold between 36 and 41 °C, depending on which model was used. Based on both biological and statistical goodness-of-fit criteria, the non-linear model of Lactin-1 had the best described the experimental data. The information herein highlighted the higher performance of T. brassicae at tropical conditions and can be helpful to predict possible effects of temperature on developmental rate, select the best period of time for inundative release and improve mass rearing protocols of this parasitoid wasp.
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•Trichogrammatidae has been extensively utilized in different cropping systems around the world to control pests.•We investigated possible effects of temperature on pre-adult development of Trichogramma brassicae.•Trichogramma brassicae performed best at higher temperatures.•The results obtained would be so helpful to optimize biological performance of T. brassicae in agro-ecosystems. |
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| ISSN: | 0261-2194 1873-6904 |
| DOI: | 10.1016/j.cropro.2021.105562 |