Effect of host condition and photoperiod on the development of <i>Microctonus hyperodae</i> Loan, a parasitoid of the Argentine stem weevil ( <i>Listronotus bonariensis</i> (Kuschel))

Abstract

Abstract Microctonus hyperodae , a euphorine parasitoid of Listronotus bonariensis , was found to enter photoperiodically induced diapause independently of the seasonally determined reproductive condition of its host. Indications were that the critical daylength may be c. 12.3: 11.7 L:D, which represents a photoperiod of 13.6: 10.4 L:D.