Annual District Reports: Forest Insect and Disease Survey ... - NFIS

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2.2.h Yellow-headed Spruce Sawfly, Pikonema alaskensis (Roh.):-
Caused light to moderate defoliation of a few widely scattered open-growing
white spruce at Lake St. George and on three ornamental spruce at
Beaver Creek. Elsewhere populations were very low and defoliation
negligible.
2.2.5 Pine Needle Scale, Phenacaspis pinifoliae (Fitch):- Young
scales were active by June 10 and relatively high populations were
noted on the foliage of planted white and Colorada spruce at several
locations. Light to moderate (and occasionally severe) infestations
occurred in Assiniboine and Kildonan parks but were generally light
elsewhere in Metropolitan Winnipeg, and moderate to heavy damage was
recorded in spruce shelterbelts in the Somerset and Pilot Mound areas in
west-central Manitoba. In addition, two small areas of light infestation
were recorded on jack-pine in the Interlake section; one located
seven miles north of the Fairford River on Highway No. 6 and the other
at Mile 45 along the Sypsumville-Grand Rapids Highway.
2.2.6 Balsam-fir Sawfly Neodiprion abietis complex:- Populations of
this defoliator continued to decline in the Interlake section, and it was
not recorded in southwestern Manitoba (Fig. Ii). Larval collections were
taken from white and black spruce near Riverton, Red Rose Tower, Arborg
and Fairford, but resultant defoliation was very light in these areas.
2.2.7 A Shoot Moth on Jack Pine, Eucosma gloriola (Hein.):- This shoot
moth was more widespread than in 1962, but the incidence of damaged jack
pine leaders remained relatively light in all areas. The infestations
near Dawson Cabin and Woodridge in southeastern Manitoba coalesced and
expanded to form an almost continuous infestation throughout young jack
pine stands in the area extending from Piney and South Junction through
Vassar, Sandilands and Marchand to East Braintree. The infestation
previously reported in the Interlake section also increased in size and
larval collections were taken as far as Mile 28 north of Gypsumville.
2.2.8 Spruce Spider Mite, Oligonychus ununguis (Jac.):- Spider mites
were common during the early part of the season and caused moderate to
severe injury to ornamental Colorada and white spruce in residential and
park areas throughout Metropolitan Winnipeg. Elsewhere, light infestations
were recorded in the Carberry and Camp Hughes areas in southwestern
Manitoba.
2.2.9 Forest Tent Caterpillar, Malacosoma disstria Hbn.:- The forest
tent caterpillar again caused serious defoliation of trembling aspen
stands in several locales throughout the Interlake section but remained at
endemic levels in southwestern Manitoba (Fig. 6). The old infestation