PARASITOIDS OF THE INTRODUCED PINE SAWFLY, DIPRION SIMILIS (HYMENOPTERA: DIPRIONIDAE), IN MINNESOTA

1977 ◽  
Vol 109 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Barbara C. Weber
Keyword(s):  
Parasitization Rate ◽  
Pine Sawfly ◽  
Diprion Similis ◽  
Trees And Shrubs

AbstractParasitoids of the overwintering generation of the introduced pine sawfly were surveyed in Minnesota. The parasitization rate was greatest in cocoons collected from foliage in fall 1971, but there was nearly complete mortality of sawflies and parasitoids in cocoons above the snowline by April 1972. Monodontomerus dentipes (Dalm.) most commonly emerged from cocoons collected from trees and shrubs in fall 1971. Exenterus amictorius (Panz.) was the most common parasitoid of cocoons collected from duff in both 1971 and 1972.

Diapause Induction in a Kentucky Population of Diprion similis (Hymenoptera: Diprionidae)

1999 ◽  
Vol 34 (3) ◽  
pp. 328-334 ◽  
Author(s):  
Heidi L. Melcher ◽  
Lee H. Townsend
Keyword(s):  
Diapause Induction ◽  
Pine Sawfly ◽  
Sensitive Stage ◽  
Diprion Similis ◽  
Critical Photoperiod ◽  
Photoperiod Sensitive ◽  
Chilling Period

Critical photoperiod, sensitive stage for diapause induction, and requirements for termination of diapause were studied in a colony of the introduced pine sawfly, Diprion similis (Hartig), established from a feral Kentucky population. We investigated induction of diapause in the laboratory under photoperiods of 10:14, 11:13, 12:12, 13:11, 14:10, 15:9, and 16:8 (L:D) in the first trial, and added a photoperiod of 9:15 (L:D) in the second trial. Individuals exposed to light periods ≤12:12 (L:D) entered diapause; individuals in a photoperiod > 13:11 (L:D) bypassed diapause. The sensitive stage was determined using reciprocal switches of diapause-inducing (9:15) and non-diapause inducing (16:8) L:D regimes. Our studies indicated that late instars of the introduced pine sawfly are significantly sensitive to photoperiod. Termination of diapause in D. similis did not require a cold or chilling period. All individuals from critical photoperiod trials were kept at 22°C to determine the duration of diapause. Diapausing individuals emerged from the cocoon after 82 to 105 d, compared to 6 to 23 d for individuals not entering diapause.

Pupation Site Selection and Enemy Avoidance in the Introduced Pine Sawfly (Diprion similis)

2017 ◽  
Vol 24 (sp7) ◽  
pp. B19-B31 ◽  
Author(s):  
Nathaniel T. Wheelwright ◽  
Liam U. Taylor ◽  
Benjamin M. West ◽  
Erin R. Voss ◽  
Sabine Y. Berzins ◽  
...  
Keyword(s):  
Site Selection ◽  
Pine Sawfly ◽  
Diprion Similis ◽  
Pupation Site

Taxonomy of Cocoons and Puparia, and their Contents, of Canadian Parasites of Diprion similis (Htg.) (Hymenoptera: Diprionidae)

1962 ◽  
Vol 94 (3) ◽  
pp. 271-282 ◽  
Author(s):  
Thelma Finlayson
Keyword(s):  
Neodiprion Sertifer ◽  
Pine Sawfly ◽  
The Third ◽  
Parasitic Hymenoptera ◽  
Diprion Similis ◽  
European Pine Sawfly

This is the third paper of a series on the taxonomy of cocoons and puparia, cast larval skins, and other remains of parasitic Hymenoptera and Diptera that are found in or near the remains of parasitized hosts hfter the parasites have emerged. It deals with the known Canadian parasites of the introduced pine sawfly, Diprion similis (Htg.); previous papers dealt with the known Canadian parasites of the European pine sawfly, Neodiprion sertifer (Geoff.) (Finlayson, 1960a) and the European spruce sawfly, Diprion hercyniae (Mtg.) (Finlayson, 1960b). Parasites of D. similis that werk encountered in either of the nvd previous papers in the series are not described or illustrated here.

Morphology and ultrastructure of an intertergal pheromone gland in the abdomen of the pine sawfly Neodiprion sertifer (Insecta, Hymenoptera): a potential source of sex pheromones

1981 ◽  
Vol 59 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Eric Hallberg ◽  
Jan Löfqvist
Keyword(s):  
Fat Body ◽  
Cell Types ◽  
Neodiprion Sertifer ◽  
Pheromone Gland ◽  
Pine Sawfly ◽  
Potential Source ◽  
Diprion Similis ◽  
Glandular Cells ◽  
Gland Duct ◽  
Pheromone Glands

An abdominal intertergal gland of the sawfly Neodiprion sertifer was found in both sexes of the sawfly N. sertifer, which is in contrast with Diprion similis, in which the gland is known only from the female. The gland lies laterally on each side of tergite II in the fat body between the tergite wall and trachea and opens into the fold of the arthrodial membrane between tergites II and III. The emission of secretion from the gland is controlled by a muscle opening the gland duct. Expansion of the lateral trachea probably forces the secretion out of the gland's lumen.The intertergal gland is a typical insect epidermal pheromone gland formed by three cell types: glandular, ductule, and hypodermal cells. The glandular cells have microvilli-lined cavities surrounded by numerous mitochondria. From these cavities arise ductules, surrounded by ductule cells, merging into other ductules that open into the lumen of the gland. The hypodermal cells underlie the cuticular walls of the lumen. This scheme is now well-known from many insect species as typical of epidermal pheromone glands with a draining duct. Finally, the possible function of the intertergal gland's secretion is discussed.

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