Effects of Different Population Levels of the European Pine Sawfly on Young Scotch Pine Trees

1966 ◽  
Vol 59 (5) ◽  
pp. 1043-1049 ◽  
Author(s):  
Louis F. Wilson
Keyword(s):  
Scotch Pine ◽  
Pine Sawfly ◽  
Pine Trees ◽  
European Pine Sawfly

A NEW PROCEDURE FOR RAPIDLY ESTIMATING EUROPEAN PINE SAWFLY (HYMENOPTERA: DIPRIONIDAE) POPULATION LEVELS IN YOUNG PINE PLANTATIONS

1971 ◽  
Vol 103 (9) ◽  
pp. 1315-1322 ◽  
Author(s):  
Louis F. Wilson ◽  
Douglas J. Gerrard
Keyword(s):  
Negative Binomial ◽  
Confidence Bands ◽  
Pine Plantations ◽  
Scotch Pine ◽  
Simple Criterion ◽  
Pine Sawfly ◽  
Insect Populations ◽  
The Mean ◽  
European Pine Sawfly ◽  
Image Position

AbstractA method is proposed for rapidly estimating the population levels of European pine sawfly in young red and Scotch pine plantations. On the hypothesis that the numbers of larval colonies per tree are distributed within a stand according to a negative binomial series, it is shown that an estimate Y of the mean sawfly count per tree in any relevant pine stand may be predicted from knowledge of the proportion p of trees infested, by means of the equationin which k is an estimate of a distribution parameter. The estimate k is derived beforehand, by Maximum Likelihood from a series of insect populations representative of those in which predictions are contemplated.Approximate 95% confidence limits for estimated densities are computed from a variance estimator reflecting two sources of error. The plotted confidence bands pertaining to samples of various size furnish a simple criterion for judging directly from the proportion of infested trees whether or not suppression measures are needed in a plantation.

Monitoring European pine sawfly population densities with pheromone traps in young pine plantations

1999 ◽  
Vol 124 (2-3) ◽  
pp. 113-121 ◽  
Author(s):  
Päivi Lyytikäinen-Saarenmaa ◽  
Olle Anderbrant ◽  
Jan Löfqvist ◽  
Erik Hedenström ◽  
Hans-Erik Högberg
Keyword(s):  
Pine Plantations ◽  
Pheromone Traps ◽  
Population Densities ◽  
Pine Sawfly ◽  
European Pine Sawfly

Altered polyphenol metabolism in the foliage of Pinus sylvestris associated with European pine sawfly attack

1968 ◽  
Vol 46 (5) ◽  
pp. 724-725 ◽  
Author(s):  
Bart A. Thielges
Keyword(s):  
Pinus Sylvestris ◽  
Unknown Compound ◽  
Pine Sawfly ◽  
European Pine Sawfly ◽  
General Response

Modified polyphenol metabolism in Pinus sylvestris was correlated with European pine sawfly attack. The unknown compound was not restricted to damaged tissue, indicating a more general response to injury.

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.

POTENTIAL OF ANTIFEEDANTS TO CONTROL LARVAL FEEDING OF SELECTED NEODIPRION SAWFLIES (HYMENOPTERA: DIPRIONIDAE)

1976 ◽  
Vol 108 (11) ◽  
pp. 1137-1144 ◽  
Author(s):  
J. N. All ◽  
D. M. Benjamin
Keyword(s):  
Pinus Banksiana ◽  
Feeding Habits ◽  
Field Tests ◽  
Field Studies ◽  
Jack Pine ◽  
Larval Feeding ◽  
Pine Sawfly ◽  
European Pine Sawfly ◽  
Feeding Development ◽  
Laboratory Bioassays

AbstractAntifeedants for controlling larval feeding of several Neodiprion sawflies were evaluated in laboratory and field studies. Nine commercially available insect antifeedants and a hexane extract of the juvenile foliage of jack pine, Pinus banksiana Lambert, were tested on larvae of six species. In laboratory bioassays larvae exhibited varying sensitivity to antifeedants; generally species with monophagous or restricted oligophagous feeding habits were most sensitive. In the laboratory the Swaine jack pine sawfly, Neodiprion swainei Middleton, had severely restricted feeding, development, survival, and fecundity. Triphenyltin hydroxide was toxic to N. swainei and to European pine sawfly, N. sertifer (Geoffroy). In field tests certain antifeedants disrupted N. swainei feeding and development. The colonial behavior of larvae often was disrupted and solitary larvae fell from trees or wandered on twigs. Colony disruption by most antifeedants was temporary and many larvae resumed feeding.

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.

OBSERVATIONS ON THE HABITS OF AN INTRODUCED PINE SAWFLY DIPRION SIMILE HTG

1935 ◽  
Vol 67 (7) ◽  
pp. 137-140 ◽  
Author(s):  
H. A. U. Monro
Keyword(s):  
United States ◽  
Northeastern United States ◽  
Sawfly Larvae ◽  
Pine Sawfly ◽  
Pine Trees

On August 22, 1933, while the members of the Montreal staff were inspecting a nursery in Montreal, P. Q., a small number of sawfly larvae was observed feeding on the mugho pine trees. These were submitted to Ottawa and were identified as the larvae of Diprion simile Htg. This was the second record of the appearance of this species in Canada; the first being a record from Oakville, Ont., in 1931. This insect had previously been studied in the Northeastern United States by Britton and Zappe (1917) and Middleton (1923).

ROW-TYPE OVIPOSITION IN NEODIPRION SAWFLIES AS EXEMPLIFIED BY THE EUROPEAN PINE SAWFLY, N. SERTIFER (GEOFF.)

1959 ◽  
Vol 37 (3) ◽  
pp. 267-281 ◽  
Author(s):  
A. W. Ghent
Keyword(s):  
Oviposition Behavior ◽  
The Other ◽  
Leg Length ◽  
Forward Movement ◽  
Pine Sawfly ◽  
Leg Movement ◽  
European Pine Sawfly ◽  
Antennal Movement ◽  
Leg Movements

Many Neodiprion sawflies lay their eggs in a row in small pockets cut into the edges of the mature needles of various pines. These rows of eggs are remarkable for the regularity of the spacing between successive egg pockets. The regularity of egg spacing by N. sertifer is shown to arise from a stereotyped pattern of leg movements during the shift between the sites of successive egg pockets. Spacing is effected by two sets of leg movements, in each of which the three pairs of legs move forward in order from back to front. While the effective forward movement of all legs is the same, the total forward movement of the metathoracic legs is greater than that of the other legs by an amount equal to the length of an egg pocket. The metathoracic legs retrace their steps by this length as the initial incision for each new egg pocket is cut, evidently providing the force by which this incision is made. The grip-points of the legs are on the needle edge opposite to that receiving eggs, so that the wider the needle, the greater the proportion of leg length required to reach across it, and the smaller the proportion of leg movement reflected in the spacing between eggs. In this way egg spacing varies inversely with needle width. Observations on copulation, antennal movement, and related oviposition behavior are included.

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