PARASITES OF THE YELLOWHEAD SPRUCE SAWFLY, PIKONEMA ALASKENSIS (HYMENOPTERA: TENTHREDINIDAE), IN MAINE AND NOVA SCOTIA

L. C. Thompson; H. M. Kulman

doi:10.4039/ent11225-1

PARASITES OF THE YELLOWHEAD SPRUCE SAWFLY, PIKONEMA ALASKENSIS (HYMENOPTERA: TENTHREDINIDAE), IN MAINE AND NOVA SCOTIA

The Canadian Entomologist ◽

10.4039/ent11225-1 ◽

1980 ◽

Vol 112 (1) ◽

pp. 25-29 ◽

Cited By ~ 4

Author(s):

L. C. Thompson ◽

H. M. Kulman

Keyword(s):

Nova Scotia ◽

Common Species ◽

Pikonema Alaskensis ◽

Larval Parasites

AbstractThirteen species of parasites were reared from Pikonema alaskensis (Rohwer) larvae and cocoons collected in Maine and 12 species from larvae collected in Nova Scotia. Of the larval parasites, the most common species in Maine were the ichneumons Rhorus sp. 1 and Syndipnus rubiginosus Walley, and in Nova Scotia, the ichneumons Aderaeon bedardi (Provancher), Mesoleius sp., Rhorus sp. 2, and S. rubiginosus. Of the tachina flies, Palexorista bohemica (Mesnil) was more common in Maine, while it and Bessa harveyi (Townsend) were equally common in Nova Scotia. Only two cocoon parasites were reared in Maine, the ichneumon Endasys pubescens (Provancher) and the pteromalid Tritneptis diprionis Gahan. No egg parasites were reared. Parasitism totaled 12.3% in Maine larvae, 16.1% in Maine cocoons, and 46.7% in Nova Scotia larvae.

Download Full-text

Observations on the Parasites of the Pine-shoot Moth, Rhyacionia buoliana, Schiff.

Bulletin of Entomological Research ◽

10.1017/s000748530002191x ◽

1930 ◽

Vol 21 (3) ◽

pp. 387-412 ◽

Cited By ~ 31

Author(s):

W. H. Thorpe

Keyword(s):

Great Britain ◽

New Records ◽

Common Species ◽

Economic Importance ◽

Accurate Identification ◽

Trichogramma Evanescens ◽

Pupal Parasite ◽

The Common ◽

Preliminary Study ◽

Larval Parasites

A preliminary study of the parasites of the Pine-shoot Moth, Rhyacionia buoliana, in England was undertaken at the request of the Dominion Entomologist of Canada.In all twenty-eight species of primary and secondary parasites were obtained. Thirteen of these species were represented in our material by not more than two specimens and are probably of little economic importance. Of the remaining fifteen, two (Habrocytus and Eutelus) are definitely hyperparasites, and at least two of the Pimplines (P. ruficollis and P. brevicornis) are liable to live as hyperparasites under certain conditions.The dominant or “key” parasites in this complex appear to be the Braconid, Orgilus obscurator, and two Ophionines, Cremastus interruptor and Omorgus mutabilis. These were shipped to Canada and the first two have become established there.A brief account is given of the salient facts in the biology of each species and the more important diagnostic characters of the adults are described to facilitate accurate identification, often a very difficult matter.The mature larvae of the commoner species are described in detail, with the particular object of finding satisfactory specific characters.Of the common species the majority attack the larva. Pimpla examinator is the only true pupal parasite which is at all common, but Omorgus mutabilis and Orgilus obscurator, although they are essentially larval parasites, frequently remain in their host and complete their development after it has pupated. Four other species, though normally living as larval parasites, may occasionally emerge from the pupa. One egg-parasite, Trichogramma evanescens, was recorded.None of the common species is confined to R. buoliana, and there is no reason to suppose that the other species, about which less is known, are any more specific. Five of the species reared are new to Great Britain and eighteen constitute new records for this host.

Download Full-text

Variations in the Amount of Macroplankton by Day and Night

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400046634 ◽

1934 ◽

Vol 19 (2) ◽

pp. 559-567 ◽

Cited By ~ 2

Author(s):

A. C. Gardiner

Keyword(s):

Nova Scotia ◽

Common Species ◽

Calanus Finmarchicus ◽

The Common

1. Twenty oblique hauls of a stramin ring-trawl, diameter of mouth 5 feet, were made during a period of 48 hours off Liverpool, Nova Scotia, i n May, 1932.2. The common species were Thysanoëssa mschii, Th. inermis, Sagilta elegans, Calanus finmarchicus and C. hyperboreus.3. All of the above occurred in the collections made during the night n i larger numbers than in those in the daytime. No such discrepancy appeared in the case of the Fish Ova.4. The discrepancy is held to be due in each case to a proportion of the population sinking to depths greater than could be sampled by the net.

Download Full-text