Vol. 54â2000 - NorthEastern Weed Science Society
Vol. 54â2000 - NorthEastern Weed Science Society Vol. 54â2000 - NorthEastern Weed Science Society
Xanthomonas campestris pv. poannua EFFICACY ON THE ANNUAL BIOTYPE OF Poa annua. J. C. Cook, J. C. Neal, and F. H. Yelverton' ABSTRACT Field evaluations were conducted to determine the efficacy of the bacterial pathogen, Xanthomonas campestris pv. poannua (Xcp), on the annual biotype of annual bluegrass (Poa annua ssp. annual. Xcp innoculum (strain MB245l was produced by EcoSoil Inc. Target inoculation concentrations of 10 7 and 10· cfu's per ml were applied weekly or biweekly for six weeks. Applications were made at 200 gallons per acre w~h an air-pressurized sprayer. Visual evaluations for annual bluegrass control were recorded weekly. Add~ionally, percent seedhead suppression was recorded at the time of peak seedhead production, and percent cover of annual bluegrass was recorded on the last rating date of May 25, 1999. There were no significant differences between weekly and biweekly inoculations. Inoculation concentrations of 10 7 cfu's per ml did not control annual bluegrass. Four weeks after in~ial inoculation, plots with 10· cfu's per ml began to exhib~ disease symptoms. Weed control increased over time to 68% by May 25, 1999. Inoculation concentrations of 10· cfu's per ml provided 88% seed head suppression on May 17, 1999. Percent cover of annual bluegrass on May 25, 1999 was reduced by 51.6% as compared to the untreated. No further data were collected because ofthe decline of the untreated annual bluegrass due to high temperatures and drought. , Department of Horticuttural Science and the Department of Crop Science, North Carolina State Univers~ 68
NON·NATIVE VASCULAR FLORA OF BISCAYNE NATIONAL PARK, FLORIDA Richard Stalter l Department of Biology, $1. John's University, Jamaica, NY 11439 ABSTRACT The non-native vascular flora of Biscayne National Park, Florida consists of 80 species within 35 families. The Poaceae (16 species) contains the largest number of non-native species. Other families containing a high number or percent of non-native plants, are the Agavaceae, Arecaceae, Crassulaceae, Fabaceae and Sapotaceae. Schinus terebinthefolius, Casuarina eguisetifolia and Casuarina glauca pose a threat to the native species in the park. INTRODUCTION Biscayne National Park, (ENP) comprises 73,000 hectares. It is located between 25° 28'N Latitude, 800 20'W Longitude, south of Miami, Rodda. The park's northern boundary is near the southern end of Key Biscayne, while the southern boundary is near the northern end of Key Largo. Most of the land, 69,557 ha is submerged. Mangrove shoreline 1,935 ha and islands 1,720 ha make up the balance of the land that comprise Biscayne National Park. The largest islands, listed in decreasing order of size are Elliott Key 668 ha, Old Rhodes Key 259 ha. Sands Key 169 ha, Totten Key 154 ha, Little Totten Key 80 ha and Swan Key 48 ha. Congress approved the creation of Biscayne National Monument in 1968. President Johnson signed the bill on October 18, 1968, which authorized the National Park Service to purchase and develop the park over a five-year period at the cost of twenty five million dollars. The object of this study is to determine the non-native vascular flora of Biscayne National Park. A secondary objective is to identify the non-native plants that pose a threat to the native vegetation. CLIMATE The climate of Biscayne National Park is subtropical marine characterized by dry mild winters and long warm summers. Mean annual temperature is 24.4°C. January is the I Dept. of Biology, St. John's University, Jamaica, N.Y. 69
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NON·NATIVE VASCULAR FLORA OF BISCAYNE NATIONAL PARK, FLORIDA<br />
Richard Stalter l<br />
Department of Biology, $1. John's University, Jamaica, NY 11439<br />
ABSTRACT<br />
The non-native vascular flora of Biscayne National Park, Florida consists of 80<br />
species within 35 families. The Poaceae (16 species) contains the largest number of non-native<br />
species. Other families containing a high number or percent of non-native plants, are the<br />
Agavaceae, Arecaceae, Crassulaceae, Fabaceae and Sapotaceae. Schinus terebinthefolius,<br />
Casuarina eguisetifolia and Casuarina glauca pose a threat to the native species in the park.<br />
INTRODUCTION<br />
Biscayne National Park, (ENP) comprises 73,000 hectares. It is located between<br />
25° 28'N Latitude, 800 20'W Longitude, south of Miami, Rodda. The park's northern boundary<br />
is near the southern end of Key Biscayne, while the southern boundary is near the northern end of<br />
Key Largo. Most of the land, 69,557 ha is submerged. Mangrove shoreline 1,935 ha and islands<br />
1,720 ha make up the balance of the land that comprise Biscayne National Park. The largest<br />
islands, listed in decreasing order of size are Elliott Key 668 ha, Old Rhodes Key 259 ha. Sands<br />
Key 169 ha, Totten Key 154 ha, Little Totten Key 80 ha and Swan Key 48 ha.<br />
Congress approved the creation of Biscayne National Monument in 1968.<br />
President Johnson signed the bill on October 18, 1968, which authorized the National Park<br />
Service to purchase and develop the park over a five-year period at the cost of twenty five million<br />
dollars.<br />
The object of this study is to determine the non-native vascular flora of Biscayne<br />
National Park. A secondary objective is to identify the non-native plants that pose a threat to the<br />
native vegetation.<br />
CLIMATE<br />
The climate of Biscayne National Park is subtropical marine characterized by dry<br />
mild winters and long warm summers. Mean annual temperature is 24.4°C. January is the<br />
I Dept. of Biology, St. John's University, Jamaica, N.Y.<br />
69
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