Abstract
The incidence of diapause was determined in adult tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois), reared in environmental cabinets that simulated daily field photoperiods occurring at Starkville, MS, during every month of the year. Temperature was held constant at 26.7°C. Photoperiod played a major role in diapause induction. Most nymphs (77.6 to 100%) hatching between 15 September and 15 February, about half of nymphs hatching in early March or early September, and few nymphs hatching between 15 March and 15 August (1.8 to 10.3%) developed into diapausing adults. Thus, early March and early September are transitional periods during which about half of newly-hatched nymphs will develop into diapausing adults. Between those periods, almost all bugs were reproductive, and outside of them, almost all were in diapause. Hypertrophied fat body coupled with underdeveloped accessory glands were used to classify male diapause, and hypertrophied fat body coupled with lack of mature eggs were used to classify female diapause.
Published Version
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