Ovarian Anatomy and Physiological Age-grading of the Female Boll Weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae)

Redescription of Megamelus scutellaris Berg (Hemiptera: Delphacidae), a Candidate for Biological Control of Water Hyacinth

“…5). Three distinct stages were found within the nulliparous category, which we term N1, N2, and N3 af- ter Grodowitz et al (1987Grodowitz et al ( , 1997. Unlike many insect species, the N1 stage was not found in adult females of M. scutellaris (Fig.…”

“…4). The appearance and quantity of follicular relics have often been used to determine reproductive activity (Tyndale-Biscoe 1984; Grodowitz et al 1987;Grodowitz et al 1997;Lenz et al 2007;Perez-Mendoza et al 2004). …”

“…Changes in morphology, mainly in the appearance and quantity of follicular relics and collar appearance and length, were used to divide the parous stage into 3 classes; i.e., P1, P2 and P3; after Grodowitz et al (1987Grodowitz et al ( , 1997. The P1 class was characterized by follicular relics that were light in coloration indicating a low density of accumulated cellular debris.…”

Endocrine regulation of reproduction and diapause in the boll weevil, Anthonomus grandis Boheman

“…Adults were segregated by sex for sample collection according to Burke (1959). Ovarian development was assayed following the physiological age-grading method of Grodowitz and Brewer (1987). This system divides oocyte maturation into three nulliparous stages (N1-N3) and four parous stages (P1-P4).…”

Chronological Age-Grading of Three Species of Stored-Product Beetles by Using Near-Infrared Spectroscopy

“…Female weevils have a pair of ovaries, each with two ovarioles of the meroistic/telotrophic type. The accumulation of follicular relics or "yellow bodies" (Grodowitz and Brewer 1987) at the base of the ovarioles was used as the basis for age determination. Although determining the percentage of a weevil population in a given parous stage can be used to estimate population age structure, this age-grading technique is hampered by the time required to perform dissections and by the confounding effect of nutritional status on oosorption by female weevils, a physiological process that also results in follicular relic accumulation.…”