Morphological characterization and distribution of antennal sensilla of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) using scanning electron microscopy. Issue 4 (29th November 2021)

• Record Type: Journal Article
• Authors: Abalavadi Thammaiah, Rani; Pathour, Shashank; Meshram, Naresh; Kammar, Vasudev; Majumder, Sujan; Srivastava, Chitra; Pandey, Koshlendra; Singh, Jagdish
• Is Part Of: Microscopy research and technique. Volume 85:Issue 4(2022)
• Page Start: 1371
• Page End: 1391
• Publication Date: 2021-11-29
• Subjects: Helicoverpa armigera -- polyphagous -- scanning electron microscopy -- semiochemical -- sensilla; Electron microscopy -- Technique -- Periodicals; Microscopy -- Periodicals; Microscopy -- Technique -- Periodicals; 502.825
• DOI: 10.1002/jemt.24002
• Languages: English
• ISSNs: 1059-910X

Abstract

Abstract: Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) is a serious polyphagous pest of various field and horticultural crops. A complete knowledge on the morphological features of antennal sensory structures is essential for efficient semiochemical‐based control methods. The external structure and distribution of antennal sensilla in male and female adults of H. armigera were investigated using scanning electron microscopy. Eight distinct morphological types of sensilla were identified in both sexes: sensilla trichodea, sensilla basiconica, sensilla auricillica, sensilla coeloconica (multiporous), sensilla chaetica (uniporous), sensilla styloconica, sensilla squamiformia, and Böhm sensilla (aporous) in varying numbers and distribution along the length of the antennae. Of these sensilla, the most widespread are sensilla trichodea and sensilla basiconica on the antennae of both sexes. Female antennae have comparatively greater number of sensilla trichodea than male antennae. Among eight types of sensilla, sensilla basiconica, auricillica, styloconica type II, squamiformia, and Böhm sensilla were identified and reported for the first time in H. armigera . Sexual dimorphism in H. armigera was mainly detected as the variations in sensilla shape, numbers, and distribution of each type of sensilla. The sexual difference was observed in the numbers of sensilla coeloconica, chaetica, styloconica, and squamiformia per flagellomere. The possible functions of these sensilla were discussed in view of previously reported lepidopteran insects. The findings provide fundamental information on the morphology and distribution of antennal sensory structures in H. armigera . It would be useful for further detailed studies on physiological and behavioral function of each sensillum type and helpful for formulating related pest control methods. Abstract : External structure and distribution of eight types of antennal sensilla in Helicoverpa armigera using scanning electron microscopy (SEM). Sensilla basiconica (SB), sensilla auricillica (SA), sensilla styloconica (SSt) type II, sensilla squamiformia (SSq), and Böhm sensilla (BS) identified and reported for the first time. Sexual difference in the sensilla coeloconica (SCoe), sensilla chaetica (SC), SSt, and SSq numbers per flagellomere.