The Developmental Processes of Dolycoris baccarum (L.) (Hemiptera: Pentatomidae) Under Different Temperature Regimes

Understanding how insects adapt to temperature is crucial to elucidating the ecological factors shaping their life history traits. Phenological models are influenced by temperature, allowing researchers to examine how temperature affects population dynamics, geographical distribution, and the management of various insect species. This study was conducted at seven constant temperatures (15.3, 20.8, 25.0, 27.0, 30.1, 35.0, and 40.0 °C) under temperature-controlled conditions in an incubator to assess temperature-dependent development of D. baccarum. Clusters of eggs were put into Petri dishes and kept in a humidity chamber. The humidity chamber was then placed inside the incubator. Temperature affected the developmental parameters and mortality of D. baccarum reared on sesame seed pods. Stage-specific parameters, including the lower developmental threshold (LDT) and thermal constant (K, in degree days [DD]), were estimated using linear (GLM) and nonlinear (Lactin2) models, respectively. Total development time from egg to adult decreased with increasing temperature. Successful development occurred between 20.8 and 35.0 °C, and failed under 15.3 and 40.0 °C (100% nymph mortality). Egg stage duration ranged from 30.56 days at 15.3 °C to 2.07 days at 40 °C, while nymphal development ranged from 64.75 days at 20.8 °C to 21.17 days at 35.0 °C. The estimated LDT and K-values were 14.22 °C and 492.22 degree days (DD), respectively. Based on these thermal requirements, we developed a predictive model to better understand population dynamics and inform pest management strategies, which can help predict the spring occurrence, number of generations, and population dynamics of D. baccarum.