Haemolymph from larvae of Simulium venustum Say collected in Canada was tested for the presence of 49 amino acids and other ninhydrin-positive compounds. The concentrations found are listed and discussed. In connection with the possible control of S. venustum by parasitic Mermithids, it is pointed o...

Greenhouse trials were conducted to evaluate the effect of treating adult and egg stages of Choristoneura fumiferana with Insegar, a water-based commercial formulation of the juvenile hormone analogue fenoxycarb, or with water (controls) at droplet sizes and densities comparable to those achieved th...

In the first part of this study, generation times relative to temperature, together with cardinal and conceptual temperatures, were determined for four strains of Xenorhabdus bacteria that represented three geographically distinct species. The data showed that the NF strain of Xenorhabdus bovienii, ...

Two bacterial symbionts of entomopathogenic nematodes, one of which originated from Texas, U.S.A., and the other from Newfoundland, Canada, were characterized phenotypically. These strains belonged to the genus Xenorhabdus. The Newfoundland (NF) strain was shown to be X. bovienii but the Texas (TX) ...

This article provides a detailed overview of the rationale for key aspects of the protocol of the Digitalis Investigation Group (DIG) trial. It also highlights unusual aspects of the study implementation and the baseline characteristics. The DIG trial is a large, simple, international placebo-contro...

The nervous system of the mermithid nematode Romanomermis culicivorax was investigated at different developmental stages for the distribution of catecholamine(s). The catecholamines nervous system increased in complexity during development..

The nervous system of Romanomermis culicivorax was investigated at different developmental stages for the distribution of the neuropeptide FMRF-amide. The results suggest that FMRF-amide-like peptides is widely distributed within the nervous system of R. culicivorax and might function as a neurohorm...

Four strains of entomopathogenic nematodes were recycled in vivo for 2 years at temperatures ranging from 10 to 25 degrees C before the infectivity of their juveniles was compared. Infectivity was examined by measuring LC50 values for Galleria mellonella larvae at bioassay temperatures ranging from ...

Early 6th-instar larvae of Choristoneura fumiferana were topically treated with the juvenile hormone analogue fenoxycarb, and fat bodies were isolated at varying times post-treatment for metabolic studies. Fenoxycarb impaired lipid synthesis by the fat bodies, suppressing both the synthesis of fatty...

Exposure of early 4th-instar larvae of Aedes aegypti (L.) to the juvenile hormone analogue methoprene (Altosid) significantly increased the concentration of carbohydrates in the haemolymph of late 4th-instar larvae and reduced the haemolymph carbohydrate concentration of 24-h-old pupae relative to c...

In further investigations on the effects of parasitism by Mermis nigrescens on locusts [see RAE/A 61, 4050; 63, 1919], second- and third-instar nymphs of Locusta migratoria (L.) were infected with ova of the mermithid. After 24 days (when parasitic development had been completed), the haemolymph of ...

Treatment of 3rd-instar larvae and recently moulted pupae of the crucifer pest Delia radicum with methoprene suppressed eclosion to the adult stage in relation to the concentration applied. The fecundity of adults that developed from larvae and pupae treated with methoprene was not reduced compared ...