Age-related susceptibility of Tribolium castaneum (Herbst) to synthetic C18 juvenile hormone

Potential of an Insect Growth Regulator in the Management of the Rice Moth Corcyra Cephalonica Stainton, 1866 (Lepidoptera: Pyralidae)

“…IGRs often result in pupal mortality either by direct treatment, as reported by SOLTANI et al (1993), or by larval treatment. The formation of a pupal-adult intermediate in Tenebrio molitor LINNAEUS, 1758 larvae when treated with IGRs results in increased pupal mortality in this insect (EDWARDS 1976, PARWEEN 1996. Pupal mortality is dosedependent (PARWEEN 1996) and decreased with increased pupal age (SOLTANI et al 1993, EDWARDS 1976).…”

“…The formation of a pupal-adult intermediate in Tenebrio molitor LINNAEUS, 1758 larvae when treated with IGRs results in increased pupal mortality in this insect (EDWARDS 1976, PARWEEN 1996. Pupal mortality is dosedependent (PARWEEN 1996) and decreased with increased pupal age (SOLTANI et al 1993, EDWARDS 1976). The present work has shown that the percentage pupal mortality was higher in younger instars (1 st and 2 nd ) of Corcyra cephalonica when treated with methoprene: it was 29.10 ± 2.88% in the case of 1 st instar larvae when treated with 12 ppm of methoprene.…”

Functional activity of allatotropin and allatostatin in the pupal stage of a holometablous insect, Tribolium castaneum (Coleoptera, Tenebrionidae)

“…The JH titer in pupae of holometabolous insects is generally low, or JH is even completely absent, and may increase only after adult emergence [28,39,44]. Treating young pupae of T. castaneum with JH analogs resulted in the formation of pupal-adult intermediates [11,24], and a treatment of early pupae with the JH mimics methoprene or hydroprene caused formation of a second pupal cuticle in the adult molt [20,27,34]. The phenotypes were similar to those of our AS dsRNA treatments and leads us to expect a JH inhibitory role of allatostatins in the pupal stage of T. castaneum.…”