Influence of Temperature on Prespinning Eonymphs of the Swaine Jack-Pine Sawfly, <i>Neodiprion swainei</i> Midd. (Hymenoptera: Diprionidae)

Pilon, Jean-Guy; Tripp, Howard A.; McLeod, J. M.; Ilnitzky, S. L.

doi:10.4039/ent961450-11

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…Daylight surface temperatures are primarily determined by radiant energy (Maguire 1955 Larval drop occurs during the daylight hours as a rule so selection with respect to temperature is a likely possi-bility. Pilon, Tripp, McLeod, and Knitzky (1964) found that temperatures in the higher range (15.5 to 24?C) were most favorable for spinning of cocoons of N. swainei. Pilon, Tripp, McLeod, and Knitzky (1964) found that temperatures in the higher range (15.5 to 24?C) were most favorable for spinning of cocoons of N. swainei.…”

Section: Resultsmentioning

confidence: 93%

The Effect of Soil Temperatuers on the Distribution of Neodiprion Sawfly Cocoons

Stark¹,

Dahlsten²

1966

Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.Wiley is collaborating with JSTOR to digitize, preserve and extend access to Ecology This content downloaded from 137.Abstract. The distribution of cocoons of the pine-feeding sawfly, Neodiprion fulviceps (complex), is clearly related to ground surface temperature. In full shade such as provided by a brush field, cocoons are distributed relatively uniformly in the soil around the host tree; in the open, cocoons are concentrated at the base of the tree and on the north and east sides of the bole.

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Section: Resultsmentioning

confidence: 93%

The Effect of Soil Temperatuers on the Distribution of Neodiprion Sawfly Cocoons

Stark¹,

Dahlsten²

1966

Ecology

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“…When the eonymphs had spun cocoons, the latter were placed in numbered gelatin capsules and transferred to 4%-oz polyethylene Autopack containers (Pilon 1965) fitted over 16-oz glass jars containing a saturated salt solution to regulate relative humidity at 70-t-5 % . The cocoons were then kept at the same rearing conditions as the larvae.…”

Section: Methodsmentioning

confidence: 99%

“…Studies on the effects of temperature on the development of sawflies have been carried out for about 30 years (Gobeil 1941;Prebble 1941a, b, c; Brown and Daviault 1942;Elens 1953;Ohnesorge 1960;Wallace and Sullivan 1963;Pilon 1965;Pilon et al 1964;Sullivan 1965;Heron 1967;Sullivan and Wallace 1967). Papers dealing specifically with the Swaine jack-pine sawfly, Neodiprion swainei Midd., are those of Pilon et al (1964) and Pilon (1965), who respectively examined the influence of temperature on prespinning eonymphs and on adults.…”

Section: Introductionmentioning

confidence: 99%

TEMPERATURE AND PHOTOPERIOD EFFECTS ON THE IMMATURE STAGES AND ADULTS OFNEODIPRION SWAINEI(HYMENOPTERA: DIPRIONIDAE)

Philogène

Benjamin

1971

Can Entomol

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Can. Ent. 103: 1705Ent. 103: -1715Ent. 103: (1971 Larvae of Neodiprion swainei Midd. were reared to the adult stage under controlled conditions of temperature and photoperiod. The effects of temperature are particularly evident during the larval stage, cocoon spinning, and adult emergence and are also observed through variation in cocoon weight and fecundity. Feeding, fecundity, and diapause are directly related to photoperiod. Larvae eat more when the photophase is long, an effect that is detrimental to the organism because there is a parallel loss of energy expressed in the number of day-degrees required to complete development. RBsumBLa temptrature a des effets marquts sur le dkveloppement larvaire, le tissage des cocons, l'tmergence des adultes, le poids des cocons et la fkconditt de Neodiprion swainei Midd. Les variations de photopkriode semblent Etre en rapport direct avec l'activitk nutritive et la fkconditk. Les larves se noumssent davantage lorsque la photophase est longue. Ce phtnomene est dtsavantageux pour l'organisme car il implique qu'il y a une perte parallele en Cnergie qui se traduit par un plus grand nombre de degrb-jours ntcessaires au dkveloppement.

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“…Young larvae hatch in early August and feed as colonies on the previous year's foliage, during which they molt 4 to 7 times. Transformation to the ultimate instar, non-feeding stage, the p r e spinning eonymph, the stage attacked by E. amictorius and E. diprionis usually begins in late August or early September: The spinning period is variable (Tripp 1965;Pilon et al 1964), usually starting about the first of September, reaching a peak about midSeptember and ending in early October; although it has been known to peak as late as the first week in October and to last until late October or early November (Fig. 1 ) .…”

Section: Life Historiesmentioning

confidence: 99%

A COMPARISON OF DISCRIMINATION AND OF DENSITY RESPONSES DURING OVIPOSITION BY EXENTERUS AMICTORIUS AND E. DIPRIONIS (HYMENOPTERA: ICHNEUMONIDAE), PARASITES OF NEODIPRION SWAINEI (HYMENOPTERA: DIPRIONIDAE)

McLeod

1972

Can Entomol

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The oviposition behavior of Exenterus amictorius Panzer, an introduced parasite of pre-spinning eonymphs of the Swaine jack pine sawfly, Neodiprion swainei Middleton, was studied in a series of field experiments over a 5-year period in the Province of Quebec. The ability of this parasite to discriminate against hosts with previously deposited progeny varied significantly: discrimination was lacking at the beginning of the host’s spinning period, but was rapidly acquired and persisted to the end of the spinning period. The relationships were described by negative power functions of the form Iδ = aX−b, where Iδ = Morisita’s Index of Dispersion, and X = the number of days from the beginning of the host’s spinning period. The response of E. amictorius to changing host densities, however, was positive at all host densities and described by functions of the form Y = aXb, where Y = number of parasite progeny per host and X = number of hosts dropping into funnel traps at 2-day intervals during the spinning period. Over 67% of the variation in the number of progeny deposited by E. amictorius during a field experiment in 1969 was explained by changes in adult parasite density, and an additional 19% by changes in host numbers. This indicates strongly that the observed change in discrimination against previously deposited progeny bears no direct relationship to either host or parasite density. It was suggested that the change might be influenced either by a reduction in the parasite’s egg complement in time, or by an associative learning process.The density response of an indigenous parasite, Exenterus diprionis Rohwer, was comparatively much weaker and it seemed to lack the adaptive changes in discrimination against previously deposited progeny possessed by E. amictorius. Although attacks of the one species occurred independently of the other, in the event of multiparasitism E. amictorius always survived because of its faster rate of development in the host. The role of discrimination and of density response in the dominance of E. amictorius among the Exenterus spp. attacking N. swainei, and its successful establishment on a variety of North American diprionids, is discussed.

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Influence of Temperature on Prespinning Eonymphs of the Swaine Jack-Pine Sawfly, Neodiprion swainei Midd. (Hymenoptera: Diprionidae)

Cited by 9 publications

References 3 publications

The Effect of Soil Temperatuers on the Distribution of Neodiprion Sawfly Cocoons

The Effect of Soil Temperatuers on the Distribution of Neodiprion Sawfly Cocoons

TEMPERATURE AND PHOTOPERIOD EFFECTS ON THE IMMATURE STAGES AND ADULTS OFNEODIPRION SWAINEI(HYMENOPTERA: DIPRIONIDAE)

A COMPARISON OF DISCRIMINATION AND OF DENSITY RESPONSES DURING OVIPOSITION BY EXENTERUS AMICTORIUS AND E. DIPRIONIS (HYMENOPTERA: ICHNEUMONIDAE), PARASITES OF NEODIPRION SWAINEI (HYMENOPTERA: DIPRIONIDAE)

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