Results

1 - 25 of 67
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A description is given of an axenic laboratory method for rearing Choristoneura fumiferana larvae that is suitable for physiological studies. The rearing procedure is a modification of the method of D. G. Grisdale (1984), using a wheat-germ based synthetic diet. The axenic rearing method resulted in...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Insects of both agricultural and medical and veterinary importance are included in this review of control of insects by nematodes. Information is collected on entomophilous nematodes that are of potential use for the regulation of insect populations, and recent progress made in investigations design...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Distribution of caudal papillae in adult Romanomermis culicivorax was determined by scanning electron microscopy. Ninety-eight caudal papillae, each containing one pore, were present in males but absent in females. Papillae were arranged in 3 longitudinal rows, one ventral and 2 ventrolateral; the m...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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..
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Four isolates (= 3 species) of steinernematids were propagated at 25, 20 and when possible, 15 and 10 degrees C for 2 years, then their capacities for tolerating high temperatures and freezing determined. In all isolates, the temperature at which 50% of the infective juveniles died (LT50) increased ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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 ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The kinetic properties of two metabolic enzymes, glucose-6-phosphate dehydrogenase and hexokinase, were studied in 4 strains of entomopathogenic nematodes that had been recycled for two years at various temperatures: Steinernema feltiae NF strain, S. feltiae Umea strain, S. carpocapsae. All strain, ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Eggs (0-24 h old and 48-72 h old) of Choristoneura fumiferana were treated topically with fenoxycarb dissolved in acetone. Only 25% of treated eggs hatched, compared to 90% of control eggs. Survival of larvae from treated eggs to induction of diapause in the 2nd instar, and of diapausing larvae, was...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The effects of methoprene on post-feeding larvae of Delia radicum was investigated. Treatment of larvae with methoprene at 1 micro g did not affect the capacity of the insect to pupate, but suppressed eclosion to the adult stage. The concentration of haemolymph trehalose was significantly decreased ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
When larvae of Aedes aegypti (L.) infected with Romanomermis culicivorax were fed on a diet low in quantity or protein content or both, the number of postparasites that emerged from the hosts decreased and host mortality increased marginally. Parasitic development was prolonged and became asynchrono...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
This paper (only an abstract of which is given) was presented at the Sixteenth Annual Meeting of the Society of Nematologists held at East Lansing, Michigan, from 16 to 19 August 1977. An account is given of studies carried out in Canada on the effect of parasitism by the mermithid nematode Neomesom...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The haemolymph of larvae of Prosimulium mixtum Syme & Davies/P. fuscum Syme & Davies and Simulium venustum Say parasitised by the mermithid nematode Neomesomermis flumenalis was compared with that of unparasitised hosts with respect to protein, amino acid and carbohydrate composition. The me...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Newly hatched larvae of Aedes aegypti (L.) were experimentally infected with controlled numbers of Romanomermis culicivorax and reared at 27 deg C on 4 types of diet (low or high protein diets, ad libitum or restricted in quantity). The numbers of parasites emerging from the mosquitoes were signific...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The effect of 7 juvenile hormone analogues on the development of larvae of Choristoneura fumiferana was studied in the laboratory at 23 degrees C, LD 16:8 and 65% RH by topical application of the compounds to early 6th-instar larvae. Fenoxycarb showed the highest potential for control, with an LC50 ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Eggs of Delia radicum 24-28 h old were treated with the same doses of 4 insect growth regulators. Diflubenzuron significantly reduced egg hatch as compared with untreated and solvent-treated controls. Methoprene had a delayed effect, preventing hatching of adults from pupae that subsequently develop...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The effectiveness of topical applications of the juvenile hormone analogue fenoxycarb against selected stages of Choristoneura fumiferana was determined. Fenoxycarb prevented eggs at an early stage of embryogenesis (0-24 h old) from hatching, and these eggs were more sensitive to the compound than o...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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 ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Laboratory bioassays were conducted to determine the effects of two carbamates, carbofuran (an acetylcholinesterase inhibitor) and fenoxycarb (a juvenile hormone analog), on survival and infectivity of the infective juveniles (IJ) of Steinernema feltiae Umea strain and Steinernema carpocapsae All st...