True bug Stenomacra marginella (Hemiptera: Largidae) associated with Mexican sunflower Tithonia diversifolia (Asterales: Asteraceae) in Cerro Punta, Chiriquí, Panama

Abstract

Objectives: To identify both the Asteraceae species found in Cerro Punta, as well as the species of the bug associated with it and to determine if it is a pest insect. Methodology: Photographs of leaves and flowers of the plant were taken and three specialists in botany were consulted for the corresponding identification. Additionally, a total of 39 specimens of the bug were collected, which were reviewed in the laboratory, consulting specialized literature and the genitalia of the male was dissected to confirm the adequate identification of the species. Results: The Asteraceae species found in Cerro Punta is Tithonia diversifolia and the bug corresponds to Stenomacra marginella (Herrich-schaeffer, 1850) (Hemiptera: Largidae). This insect has been referred to as omnivore; therefore, it cannot be considered as a pest species; although it could contribute to the balance of the agroecosystem, by serving as an alternative food for predators and parasitoids, in addition to potentially serving as a pest predator. Conclusions: The wild Asteraceae species found in Cerro Punta, Chiriquí, Panama, corresponds to Tithonia diversifolia. The predominant insect observed on this plant was Stenomacra marginella; which can be considered as a stabilizer of the agroecosystem.