Novaluron prevents oogenesis and oviposition by inducing ultrastructural changes in ovarian tissue of young adult Lygus lineolaris. Issue 12 (13th July 2020)

• Record Type: Journal Article
• Authors: Catchot, Beverly; Anderson, Chance JH; Gore, Jeffrey; Jackson, Ryan; Rakshit, Kuntol; Musser, Fred; Krishnan, Natraj
• Is Part Of: Pest management science. Volume 76:Issue 12(2020)
• Page Start: 4057
• Page End: 4063
• Publication Date: 2020-07-13
• Subjects: benzoylphenyl urea -- hatching -- Lygus lineolaris -- novaluron -- oviposition; Pests -- Control -- Periodicals; Pesticides -- Periodicals; 632.9
• DOI: 10.1002/ps.5960
• Languages: English
• ISSNs: 1526-498X

Abstract

Abstract: BACKGROUND: The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), has emerged as a major pest of cotton, Gossypium hirsutum L, in the mid‐southern USA. In the early 1990s L. lineolaris populations developed resistance to several classes of conventional insecticides, increasing the need for insecticides with alternative modes of action such as insect growth regulators (IGRs) for integrated pest management (IPM). The benzoylphenyl urea (BPU) class of IGRs acts by disrupting the growth and development of immature stages of insects, but little is known about its impact on adult stages. RESULTS: The effect of novaluron (Diamond™ 0.83EC), a BPU with known chitin synthesis inhibitor activity, was investigated on adult females of L. lineolaris . Treatment of 1‐day‐old adults with 600 ppm of novaluron in the diet prevented oviposition, while treatment of older females had no impact on oviposition. Oral novaluron exposure of adults of all ages reduced the viability of eggs laid. Novaluron treatment caused ultrastructural changes in the ovaries of 1‐day‐old adults (48 h post exposure), distorting the follicular epithelial cell architecture of developing oocytes. Additionally, novaluron treatment decreased the chitin content in ovarian tissue. CONCLUSION: Our results suggest that chitin or chitin‐like components in the developing ovaries of adult L. lineolaris are a target of IGRs such as novaluron, but its activity is specific to a critical time during development. This enhances our understanding of the effects of BPUs on adult insects and could lead to incorporation of IGRs in IPM for controlling adult insect pest populations in the field. © 2020 Society of Chemical Industry Abstract : Novaluron treatment of young adult Lygus lineolaris preventedoviposition by inducing ultrastructural changes in developing oocytes aswell as by decreasing chitin content in ovarian tissue. Older adultstreated with novaluron displayed decreased egg viability.