Inclusions in adults of the European pine sawfly, Neodiprion sertifer (Geoff.)

1968 ◽  
Vol 46 (5) ◽  
pp. 959-963 ◽  
Author(s):  
C. R. Sullivan ◽  
D. R. Wallace
Keyword(s):  
Neodiprion Sertifer ◽  
Larval Rearing ◽  
Frequency Of Occurrence ◽  
Rearing Temperature ◽  
Pine Sawfly ◽  
European Pine Sawfly ◽  
Nuclear Polyhedrosis

Hard, dark-red, tumor-like inclusions that are apparently unrelated to nuclear polyhedrosis have been detected in adult Neodiprion sertifer. The frequency of occurrence of these structures is related to larval rearing temperature. They are consistently more common in adults that have undergone prepupal diapause than in adults that have not had a prepupal diapause. Differences in the incidence of the inclusions occur between families, and the bodies are more commonly found in females than in males.

Estimation of nuclear polyhedrosis virus produced in field populations of the European pine sawfly, Neodiprion sertifer (Geoff.) (Hymenoptera: Diprionidae)

1983 ◽  
Vol 61 (8) ◽  
pp. 1857-1861 ◽  
Author(s):  
W. J. Kaupp
Keyword(s):  
Inclusion Bodies ◽  
Nuclear Polyhedrosis Virus ◽  
Direct Result ◽  
Neodiprion Sertifer ◽  
Sawfly Larvae ◽  
Pine Sawfly ◽  
Early Instar ◽  
European Pine Sawfly ◽  
Nuclear Polyhedrosis ◽  
Appreciable Reduction

The quantity of virus measured as the number of polyhedral inclusion bodies (PIBs) produced and liberated at death from two diseased European pine sawfly (Neodiprion sertifer (Geoff.)) populations was studied over a 3-year period in Britain. As high as 2.3 × 1015 PIBs/ha were produced as a resut of a natural epizootic in one of the populations. Subsequent years saw an appreciable reduction in the quantity of the virus produced, a direct result of the reduction in the number of sawfly larvae infesting each plot. Polyhedra persisting over winter in the host's environment were found to alter the nature of subsequent epizootics by causing virus infection to occur at an earlier stage of larval development than previously observed. This increased the percentage contribution of PIBs from the death of early instar larvae to the total amount of virus produced.

Variations in the photoperiodic response of Neodiprion sertifer

1968 ◽  
Vol 46 (5) ◽  
pp. 1082-1083 ◽  
Author(s):  
C. R. Sullivan ◽  
D. R. Wallace
Keyword(s):  
Natural Populations ◽  
Photoperiodic Response ◽  
Neodiprion Sertifer ◽  
Larval Rearing ◽  
Single Population ◽  
Rearing Temperature

Natural populations of N. sertifer, located at about the same latitude in Ontario, differ considerably in their response to photoperiods inducing non-diapause when reared as larvae at identical temperatures. In addition, within a single population, the incidence of non-diapause varies inversely with larval rearing temperature.

CANDLING AND SIGHTING TECHNIQUES USED IN LASER INVESTIGATIONS OF THE EUROPEAN PINE SAWFLY, NEODIPRION SERTIFER (HYMENOPTERA: DIPRIONIDAE)

1967 ◽  
Vol 99 (6) ◽  
pp. 670-672 ◽  
Author(s):  
Ronald W. Kobylnyk
Keyword(s):  
Laser Treatment ◽  
Light Transmission ◽  
Transmitted Light ◽  
Neodiprion Sertifer ◽  
Accurate Assessment ◽  
Pine Sawfly ◽  
Avian Eggs ◽  
Egg Shell ◽  
European Pine Sawfly ◽  
Zoology Department

Laser treatment of larval and pupal stages within cocoons of Neodiprion sertifer (Geoff.) requires an accurate assessment of viability and the antero-posterior alignment of the cocoon content. The use of the candling technique to assess qualitative features of avian eggs depends on the translucency of the egg shell and the differences in light transmission by other elements within it (Romanoff and Romanoff 1949). Transmitted-light methods have been employed for insects within cocoons by Cushman (1913) and Hanna (1935). A type of candling technique different from previous methods and which was developed in the Zoology Department, University of Guelph, enables N. sertifer cocoon content to be ascertained and is herein described.

Effects of Temperatures of Rearing on Reproduction of Aptesis basizona (Grav.) (Hymenoptera: Ichneumonidae)

1961 ◽  
Vol 93 (9) ◽  
pp. 799-801 ◽  
Author(s):  
Thelma Finlayson
Keyword(s):  
Cold Storage ◽  
Reproductive Capacity ◽  
Neodiprion Sertifer ◽  
Immature Stages ◽  
Pine Sawfly ◽  
Pine Sawflies ◽  
European Pine Sawfly

Aptesis basizona (Grav.), a parasite of pine sawflies in Europe, was propagated at Belleville, Ont. (Green, 1938) for release against the European spruce sawfly, Diprion hercyniae (Htg.), the European pine sawfly, Neodiprion sertifer (Geoff.) and other Diprionidae. Development of the insects in the laboratory was allowed to continue until feeding was completed and cocoons were spun, and was then retarded by placing the insects in cold storage pending shipment to release areas. Frequently stock for propagation was incubated after a period of cold storage, and occasionally the schedule was interrupted by decreases in the reproductive capacity of the adults. It seemed that there was some relationship between the fertility of the adults and the temperatures at which the immature stages were held, both while feeding and after they had reached the fully-fed stage. Experiments were initiated to investigate this hypothesis.

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