Dolycoris baccarum (L.) (Hemiptera: Pentatomidae) Infestation Induced Differential Changes in Plant Physiology: Preference and Damaging Nature to Different Sesame (Sesamum indicum L.) Varieties

Abstract

Simple Summary The shield bug, Dolycoris baccarum (Hemiptera: Pentatomidae), is an important insect pest that threatens the production of several crops in Korea, particularly sesame (Sesamum indicum L.) and soybean (Glycine max L.). Delayed control measures can lead to substantial yield reduction and economic losses, highlighting the need for timely management. In this study, we investigated the effects of D. baccarum feeding on photosynthetic performance and chlorophyll fluorescence signal in different sesame varieties. In addition, laboratory experiments were conducted to evaluate varietal feeding preference and the extent of feeding damage caused by the insect. The results showed that D. baccarum feeding significantly altered photosynthetic activity and chlorophyll fluorescence characteristics. The insect also displayed distinct preferences among sesame varieties, and the severity of feeding damage varied markedly across genotypes. These findings provide important insights into the physiological mechanisms associated with sesame resistance and tolerance to D. baccarum. Identification of tolerant genotypes offers valuable genetic resources for breeding programs aimed at developing sesame cultivars with enhanced resistance or tolerance to stink bug infestation and supports the development of sustainable integrated pest management strategies.