Temperature-dependent development of Scizaphis graminum Rondani and its stage emergence models

Document Type : Agricultural Entomology

10.22092/jaep.2025.369624.1544

Abstract

The greenbug, Scizaphis graminum Rondani (Hemiptera: Aphididae), is a globally distributed polyphagous pest. This study investigated the impact of temperature on the development of S. graminum, reared on wheat (Pishgam variety) under laboratory conditions across a temperature range of 10 to 32.5°C. S. graminum successfully completed nymphal development at all tested temperatures. Development rate increased from 10.0 to 30°C, then decreased at higher temperatures. Linear models estimated lower developmental threshold temperatures (Tmin) for nymphal instars (NI-NIV) and the total developmental period as 3.1, 7.24, 6.64, 8.29, and 6.78°C, respectively. Corresponding thermal constants were 55.19, 23.62, 26.85, 25.52, and 116.58 degree days (DD). Stage emergence models, incorporating nonlinear development rate (Lactin 2) and a logistic distribution, were constructed to simulate individual progression through each developmental stage. These models can be used to develop population models of S. graminum aphids, help understand population dynamics and develop integrated management strategies for this pest in wheat and barley crops.
 
 

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References

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Applied Entomology and Phytopathology
Volume 93, Issue 1 - Serial Number 120
September 2025
Pages 39-49

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