Entomophthora canadensis n.sp., a fungus pathogenic on the woolly pine needle aphid, Schizolachnus piniradiatae

1979 ◽  
Vol 57 (23) ◽  
pp. 2663-2672 ◽  
Author(s):  
D. M. MacLeod ◽  
D. Tyrrell ◽  
R. S. Soper
Keyword(s):  
New Species ◽  
Red Pine ◽  
Pine Plantations ◽  
Morphological Development ◽  
Pine Needle

Entomophthora canadensis n. sp. is described and illustrated, and its morphological development traced. The new species differs from all other species of the genus, by its distinctively shaped conidia, long–elliptical to nearly cylindrical, average 25.0 μm × 10.0 μm, and its ornamented azygospores, verruculose to lightly rugulose, average 34.0 μm diameter. It is compared with E. aphidis, within which it has been included, and E. sphaerosperma, the species it most closely resembles.Entomophthora canadensis is currently known only from populations of the aphid Schizolachnus piniradiatae, in red pine plantations in Ontario, Canada.

A New Laspeyresia Species on Red Pine

1962 ◽  
Vol 94 (12) ◽  
pp. 1272-1273 ◽  
Author(s):  
T. N. Freeman
Keyword(s):  
New Species ◽  
Hind Wing ◽  
Outer Margin ◽  
Red Pine ◽  
Pine Plantations ◽  
Forest Insect ◽  
Black Line ◽  
The Third ◽  
Basal Half ◽  
Outer Half

During his study of the ecology of red pine plantations, Mr. J. L. Martin, Forest Insect Laboratory, Sault Ste. Marie, Ontario, found a species of Laspeyresia feeding as larvae under the bark of living trees. This species is described here to enable him to report on the results of his investigation.Laspeyresia resinosae, new speciesAntenna, head, thorax, and abdomen powdery-grey. Basal half of forewing grey; outer half blackish, with cupreous reflections, the tips of the scales ochreous; outer three-fifths of costa with four pairs of silvery-white geminations; the basal pair of geminations fuse into a single, angular, transverse, shiny-leaden fascia, that extends to the trailing margin just beyond the middle; a similar fascia arises from the second costal geminations, and extends only to the fold; a third leaden fascia arises from the apical geminations, extends irregularly to the tornus, and is broken into three almost equal sections; the central portions of the second and third fasciae are narrowly margined with a few black scales, representing a very poorly defined ocelloid patch; outer margin with a very distinct black line basad to the shiny leaden fringe; the black line cut by three white dashes, two opposite the breaks in the outer, transverse fascia, and the third at the tornal end of that fascia. Hind wing powdery-grey; fringe dirty-white with darker basal line. Under-surface and legs silvery-grey. Tarsi black banded. Wingspread: 9.5-10.5 mm. Moth in late June and early July.

THE INSECT ECOLOGY OF RED PINE PLANTATIONS IN CENTRAL ONTARIO: V. THE COCCINELLIDAE (COLEOPTERA)

1968 ◽  
Vol 100 (8) ◽  
pp. 835-846 ◽  
Author(s):  
W. C. Gagné ◽  
J. L. Martin
Keyword(s):  
Prey Capture ◽  
Red Pine ◽  
Pine Plantations ◽  
Ecological Groups ◽  
Population Fluctuations ◽  
Pine Needle ◽  
Mortality Factors ◽  
Old Field ◽  
Larval Stages ◽  
Insect Ecology

AbstractThirteen species of Coccinellidae were found to occur in adjacent red pine plantations of five different ages near Thessalon, Ont. These populations fell into two major ecological groups corresponding to the two plantation age classes. One group (the old-field species) inhabited young plantations up to 16 years old, and the other (the old-stand species) inhabited older stands. Each group was characterized by different dominant species, Coccinella transversoguttata Falder-man and Scymnus lacustris Lec. in the younger stands, and Mulsantina picta (Rand.) and Anatis mali Auct. in the older stands. Species diversity decreased as the stands aged.As the red pines increased in size, they became less favourable for coccinellids in general because prey density decreased. As a consequence, the predator’s search area per unit prey capture increased necessitating an increased searching capacity and mobility. Coccinellid population fluctuations were synchronized with those of the woolly pine needle aphid, Schizolachnus piniradiatae (Davidson), the major food source, due to compensative movements to and from the plantations of the adult coccinellids and the dependence of the larvae on the aphid. Starvation and cannibalism during the larval stages appeared to be the major mortality factors. Inclement weather and predation were of minor direct importance to coccinellid populations and parasitism was rare.All species, with the possible exception of S. lacustris, were univoltine.

Estimation de la production de jeunes plantations de pin rouge et de pin gris du sud du Québec

1976 ◽  
Vol 6 (4) ◽  
pp. 478-486 ◽  
Author(s):  
H. A. Bolghari
Keyword(s):  
Multiple Regression ◽  
Jack Pine ◽  
Red Pine ◽  
Pine Plantations ◽  
Regression Equations ◽  
Pine Plantation ◽  
South Shore ◽  
Pine Stands ◽  
Natural Stands ◽  
St Lawrence River

Multiple regression equations have been developed to predict yield from young red pine and jack pine plantations. Data from 446 sample plots representing young red pine and jack pine stands located on the south shore of the St. Lawrence River between Quebec and Montreal were analysed. The red pine plantation yielded more than the jack pine. However, in plantation both species yield more than in natural stands. Taking into account the age and spacing of the sampled plantations, the equation obtained can provide information on yield of red pine and jack pine stands the maximum spacing of which is 3 × 3 m, up to the age of 45 and 35 years respectively. The equations will allow the construction of preliminary yield tables for both species.

An Approach to Assessing Competition in Young Red Pine Plantations

1995 ◽  
Vol 12 (3) ◽  
pp. 101-108
Author(s):  
James E. Johnson ◽  
Scott G. Lindow ◽  
Robert Rogers
Keyword(s):  
Age Groups ◽  
Quantitative Relationship ◽  
Red Pine ◽  
Pine Plantations ◽  
Volume Index ◽  
Regression Equations ◽  
Tree Class ◽  
Performance Variables ◽  
Class 1 ◽  
Tree Performance

Abstract Several 5- and 6-yr-old red pine plantations in central Wisconsin were sampled to assess the performance of crop trees and the levels of competing vegetation. A simple tree class system was devised to classify the level of brush competition on a fixed area plot surrounding each sampled crop tree. The tree class was significantly correlated with several measured and derived competition variables, and was also strongly related with three tree performance variables: height, volume, and biomass. Tree Class 1, the lowest competition level, was associated with significantly greater tree heights, volumes, and biomasses for both age groups. Logistic regression equations were developed to derive a quantitative relationship between competition, as measured by tree class, and crop tree performance. Performance was judged to be either adequate or inadequate based on an arbitrary set of standards for both volume and biomass. From the regression equations, probabilities of successful performance were calculated. For volume index and biomass, the Class 1 trees, or the trees with the lowest levels of competition, had success probabilities ranging from 76 to 89%. For the Class 4 trees, or the trees with the highest levels of competition, success probabilities ranged from 3 to 16%. North. J. Appl. For. 12(3):101-108.

scholarly journals RAPID ESTIMATE OF VOLUME IN RED PINE PLANTATIONS

1957 ◽  
Vol 33 (4) ◽  
pp. 333-334
Author(s):  
W. M. Stiell
Keyword(s):  
Red Pine ◽  
Pine Plantations
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