Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
Proceedings of the Sixty-first Annual Meeting of the Northeastern ... Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
76 Japanese knotweed control 28 DAT and biomass reductions 28 DAT and 218 DAT/ 30 DAE. 2005-2006. 1, 2 Japanese knotweed control 1 Japanese knotweed dry weights 1 Herbicide treatment Rate 28 DAT 28 DAT 30 DAE -kg ai/ha- -%- -kg/plot- -kg/plot- Triclopyr 0.56 + carfentrazone-ethyl 6 0.093 88.0a 0.116e 0.262b Triclopyr 0.28 + carfentrazone-ethyl 6 0.093 90.7a 0.120de 0.348b Triclopyr 0.56 + carfentrazone 0.093 + mesotrione 6 0.106 80.7ab 0.181bcd 0.307b F-4113 5.8 73.7abc 0.137cde 0.00c Carfentrazone-ethyl 0.22 + glyphosate 1 5.68 69.0abc 0.162cde 0.00c Triclopyr 1 0.56 71.3abc 0.189bc 0.269b Triclopyr 0.56 + mesotrione 6 0.106 70.7abc 0.172bcde 0.246b Glyphosate 3.1 51.3bcd 0.192bc 0.00c Triclopyr 0.28 + mesotrione 6 0.106 43.3cde 0.261a 0.2530b Glyphosate 3.65 35.0de 0.188bc 0.00c Glyphosate 1.85 20.0ef 0.195bc 0.00c Untreated Control --- 0.0f 0.235ab 0.636a LSD0.05 --- 30.7 0.06527 0.2279 1 Abbreviations: DAT, days after treatment, DAE, days after emergence (07 MAY 2006) 2 Means followed by the same letter are not significantly different according to Duncan’s multiple range test at the 0.05 level of significance 3 Japanese knotweed control was estimated visually 7, 14, 21, and 28 DAT. 4 Japanese knotweed biomass, taken as three 1meter 2 sub-samples per plot, were collected 28 DAT and 218 DAT/ 30 DAE. Biomass dry weights were representative of percent reduction when compared to the control. 5 Treatments included a non-ionic surfactant at 2.5% v/v 6 Treatments included crop oil concentrate at 1% v/v 58
77 HURRICANES, AGING FORESTS, AND OVERABUNDANT WHITE-TAILED DEER: FACILITATORS OF INCREASED EXOTIC PLANT INVASION. J.L. Snitzer, H.M. McNett, K.L.A. Caraher, J. Bailey, Hood College, Frederick, MD, K.L. Kyde, Maryland Dept. of Natural Resources, Annapolis, and D.H. Boucher, Hood College, Frederick, MD. ABSTRACT Based on results in Eastern deciduous forests in Central Maryland damaged by hurricanes Isabel, Ivan and Katrina, the following observations were made: 1. Forests in the Mid-Atlantic States are becoming increasingly susceptible to windthrow as they age and as tree size increases. 2. Exotic invasive plants are favored by the canopy gaps and soil disturbance created by windthrow. 3. Browse by white-tailed deer reduces the percent cover of native plants and increases the percent cover of exotic plants following storm damage. The combination of selective deer browse and extensive colonization of stormdamaged forest by exotic plants may be altering forest regeneration. 59
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77<br />
HURRICANES, AGING FORESTS, AND OVERABUNDANT WHITE-TAILED DEER:<br />
FACILITATORS OF INCREASED EXOTIC PLANT INVASION. J.L. Snitzer, H.M.<br />
McNett, K.L.A. Caraher, J. Bailey, Hood College, Frederick, MD, K.L. Kyde, Maryland<br />
Dept. <strong>of</strong> Natural Resources, Annapolis, and D.H. Boucher, Hood College, Frederick,<br />
MD.<br />
ABSTRACT<br />
Based on results in Eastern deciduous forests in Central Maryland damaged by<br />
hurricanes Isabel, Ivan and Katrina, <strong>the</strong> following observations were made:<br />
1. Forests in <strong>the</strong> Mid-Atlantic States are becoming increasingly<br />
susceptible to windthrow as <strong>the</strong>y age and as tree size increases.<br />
2. Exotic invasive plants are favored by <strong>the</strong> canopy gaps and soil<br />
disturbance created by windthrow.<br />
3. Browse by white-tailed deer reduces <strong>the</strong> percent cover <strong>of</strong> native plants<br />
and increases <strong>the</strong> percent cover <strong>of</strong> exotic plants following storm damage.<br />
The combination <strong>of</strong> selective deer browse and extensive colonization <strong>of</strong> stormdamaged<br />
forest by exotic plants may be altering forest regeneration.<br />
59
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