Geographic variation in Prunusserotina

In 1969, 1-year-old black cherry (Prunusserotina Ehrh.) seedlings from 21 to 33 provenances were planted at each of four locations in the northeastern United States. After 10 growing seasons, survival at each plantation was related to the latitude of the seed source. Differences in height among provenances were not correlated with the latitude of the seed source. Provenance × plantation interaction for height was large, as were differences in mean height among plantations. Differences in leaf characteristics were associated with the location of the seed source, but the pattern of variation in stem form was random rather than regional.

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Screening Larch for Resistance to Mycosphaerella Needlecast Disease

Northern Journal of Applied Forestry ◽

10.1093/njaf/6.4.172 ◽

1989 ◽

Vol 6 (4) ◽

pp. 172-174

Author(s):

Michael E. Ostry ◽

Thomas H. Nicholls

Keyword(s):

United States ◽

Tree Growth ◽

Rapid Growth ◽

Seed Source ◽

Intensive Management ◽

Northeastern United States ◽

North Central ◽

Source Selection ◽

The North ◽

Larch Species

Abstract Intensive management of larch in the north central and northeastern United States is receiving considerable interest because of the rapid growth of European and Japanese larch and the hybrids between these two species. A needlecast disease caused by the fungus Mycosphaerella laricina has the potential to reduce tree growth and kill highly susceptible trees. Research in Wisconsin and Iowa using six larch species and hybrids has provided data showing the importance of seed source selection in minimizing damage caused by this disease. North. J. Appl. For. 6:172-174, December 1989.

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Lithocolletis blancardella Fabricius (Lepidoptera: Gracilariidae) on Apple in Eastern North America with Notes on Other Species Occurring on Rosaceae

The Canadian Entomologist ◽

10.4039/ent961442-11 ◽

1964 ◽

Vol 96 (11) ◽

pp. 1442-1449 ◽

Cited By ~ 2

Author(s):

H. T. Stultz

Keyword(s):

United States ◽

North America ◽

Leaf Miner ◽

Eastern North America ◽

Similar Species ◽

Black Cherry ◽

Northeastern United States ◽

Maritime Provinces ◽

Eastern Canada ◽

Large Numbers

AbstractA spotted tentiform leaf miner, often present during recent years in large numbers in apple orchards in the Maritime Provinces of Canada, is identified as Lithocolletis blancardella Fabr., a species common on apples in Europe. Recent collecting indicates that the species occurs widely in Eastern Canada and the northeastern United States. Diagnostic characters, especially those of the male genitalia, are compared with those of specimens identified as L. crataegella Clem. and L. propinquinella Braun, two similar species which commonly occur on apple and black cherry respectively.

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Fern and aster effects on black cherry shelterwood regeneration

Canadian Journal of Forest Research ◽

10.1139/x90-200 ◽

1990 ◽

Vol 20 (9) ◽

pp. 1513-1514 ◽

Cited By ~ 8

Author(s):

Allan P. Drew

Keyword(s):

United States ◽

Ground Cover ◽

Height Growth ◽

Black Cherry ◽

Northeast United States ◽

Growing Seasons ◽

Forest Sites ◽

Reduced Height ◽

Study Results

Regeneration of black cherry (Prunusserotina Ehrh.) is difficult on northeast United States forest sites that are dominated by hay-scented fern (Dennstaedtiapunctilobula Michx.). The growth of black cherry seedlings beneath fern and whorled wood aster (Asteracuminatus Michx.) ground cover was monitored for eight growing seasons on weeded and unweeded plots following a shelterwood seed cutting. Black cherry seedlings on plots that were weeded to remove ferns during years 2 through 4 were significantly taller than seedlings on unweeded controls by the end of the 6th year. Yet they still were not as tall as the residual ferns not removed by weeding. Black cherry seedlings beneath aster had overtopped the aster by the end of 6 years and were almost twice as tall as black cherry on weeded fern plots. Reduced height growth of black cherry after 6 years indicated the need for overstory removal. The study results underscore the importance of controlling hay-scented fern prior to a shelterwood seed cutting.

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Improving Garlic Using Wheat Straw Mulch

HortScience ◽

10.21273/hortsci.31.4.611b ◽

1996 ◽

Vol 31 (4) ◽

pp. 611b-611

Author(s):

Angela M. O'Callaghan

Keyword(s):

United States ◽

Wheat Straw ◽

Growing Season ◽

Northeastern United States ◽

Straw Mulch ◽

Growing Seasons ◽

Cultural Conditions ◽

Soil Temperatures ◽

Wheat Straw Mulch ◽

Research Facilities

Garlic (Allium sativum L.) has been cultivated in much of the world for millennia. Little scientific research, however, has focused on improving cultural conditions for production in the temperate regions of the northeastern United States, where garlic is gaining importance as a horticultural crop. To study the effectiveness of wheat straw (Triticum aestivum) mulch on garlic, experiments were conducted at the Cornell Univ. research facilities in East Ithaca, N.Y., during the 1993–94 (year 1) and 1994–95 (year 2) growing seasons and at the Homer C. Thompson Vegetable Research Farm, Freeville, N.Y., during the 1994–95 growing season. Two clones, one bolting and one nonbolting, were studied in year 1, and four varieties, three bolting and one non bolting, in year 2. All were fall-planted (mid-October), and mulch treatments were covered with wheat straw early in the following December. Control plots were not covered. The mulch either remained on the crop throughout the growing season or was removed early in the spring to expedite soil warming. This is the common practice among growers who use mulch only for winter protection. The presence of mulch during the winter increased the survival rate. Soil temperatures under the wheat straw were significantly lower during the summer than soil temperatures in unmulched plots, which could have contributed to the increase found in the yield and average bulb size of several of the cultivars. Maintaining the mulch through the entire growing season reduced weed pressure >30%. We found no significant increase in the amount of basal fungal infection. The results indicate that using straw mulch can improve garlic produced in the northeastern United States.

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