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Chengyan Yue, Terry Hurley, and Neil O. Anderson

Invasive plant dispersals have been strongly affected by the trade and distribution of horticultural plants, primarily by ornamental plants ( Anderson and Ascher, 1993 ; Groves, 1998 ; Mack, 2003 ; Mack and Erneberg, 2002 ; Randall and Marinelli

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James A. Gagliardi and Mark H. Brand

., 1996 ). These impacts, coupled with the economic costs of management and control ( Pimentel et al., 2000 ), emphasize the importance of developing successful solutions to the invasive plant issue. Many plants of horticultural interest are found on the

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Carl E. Bell, Cheryl A. Wilen, and Alison E. Stanton

1 Regional Advisor-Invasive Plants. 2 Area Integrated Pest Management Advisor, Univ. of California Statewide IPM Program. 3 Former Graduate Student. This material is based upon work supported by the Cooperative State Research, Education and

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Kathleen M. Kelley, Janine R. Stumpf, James C. Sellmer, and Ricky M. Bates

Consumers were surveyed at the 2004 Philadelphia Flower Show in Philadelphia, Pa. from 8–10 Mar., to quantify their attitudes and behaviors towards invasive plant species and the potential problems associated with purchasing and planting invasives in the landscape. A majority of the 341 participants (81.5%) was aware that non-native exotic plants were used in the landscape and that these plants may be invasive in natural areas. Less than half (40.1%) acknowledged owning plants that were considered invasive, while one-third (33.5%) did not know. Less than half (41.3%) believed that laws should be passed to prevent sale of non-native exotic plants, while 27.8% believed that laws should be passed to allow sale of only native plants in their area. Three distinct consumer segments were identified using cluster analysis: “Invasive savvy,” participants knowledgeable about invasives and interested in alternative species; “Invasive neutral,” participants neutral in their decision to purchasing alternatives to invasive plants and price sensitive in regard to paying more for plants tested for invasiveness; and “Invasive inactive,” participants opposed to purchasing genetically modified plants or those bred to be seedless. Survey results indicated that media sources (e.g., television and newspapers/magazines/books) would be effective for educating consumers about potential problems associated with invasive species in the landscape.

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Sharon Frey and Carolyn Robinson

Plants have been introduced into the United States intentionally as well as unintentionally as seeds and weeds. Technological advances, a mobile society, and our curiosity and desire to improve our landscapes have led to an ever-increasing invasive movement. These alien plants can jeopardize native populations, alter ecosystems, alter fire and water regimes, change the nutrient status, modify habitats, and cause significant economic harm. Today's public is unaware of the danger some non-native plants species pose to natural areas, thereby contributing to the lack of control for non-native invasive plants. This study looked at the knowledge and attitudes of Texas Master Gardeners as related to invasive species commonly used in landscaping. A web survey was made available to all Texas Master Gardeners that included pictures of plants along with their common and scientific names. Participants were asked to identify which they thought were invasive and contribute information regarding their knowledge of non-native invasive plants. Each of the invasive plants shown is on both the federal and the Texas Invasive Plant lists. Inquires were made concerning the occurrence of these plants in the participants' personal landscape and communities and their perceptions of each plant as an invasive threat. The purpose of the study is to determine if a relationship exists between knowledge, attitudes and perceptions of the participant and the occurrence of non-native invasive plants in the landscape. The results of this study will help determine factors that contribute to the lack of control for non-native invasive plants.

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S. Christopher Marble

An invasive species is defined as “an alien (non-native) species whose introduction does or is likely to cause economic or environmental harm or harm to human health” ( USDA, 2018a ). Invasive plants have been subject to significant research from

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Lyn A. Gettys and Michael A. Schnelle

Invasive Plants Research Interest Group of the American Society for Horticultural Science (ASHS) developed and hosted workshops at the 2017 and 2018 ASHS annual conferences to explore this phenomenon. The objective of the 2017 workshop, titled “Strategies

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Pragati Shrestha and Jessica D. Lubell

landscape sites. Furthermore, high white-tailed deer pressure on many landscapes necessitates the need for white-tailed deer-resistant ornamental plants. The replacement of invasive plants with native plants is a desirable solution to the invasive plant

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Jonathan M. Lehrer, Mark H. Brand, and Jessica D. Lubell

While japanese barberry (Berberis thunbergii DC.) is an acknowledged invasive plant naturalized throughout the eastern and northern U.S., the danger posed by its popular horticultural forms is unknown and controversial. This work analyzed the reproductive potential and seedling growth of four ornamental genotypes important to the nursery industry. Fruit and seed production was quantified in 2001, 2002, and 2003 for multiple landscape plants of B.t. var. atropurpurea, `Aurea', `Crimson Pygmy', and `Rose Glow'. The average number of seeds produced per landscape specimen ranged from lows of 75 and 90 for `Aurea' and `Crimson Pygmy' to 2968 for var. atropurpurea and 762 for `Rose Glow'. Seed production relative to canopy surface area for `Rose Glow' was similar to `Aurea' and `Crimson Pygmy' and all three cultivars were less prolific than var. atropurpurea in this regard. Cleaned and stratified seeds from var. atropurpurea, `Crimson Pygmy' and `Rose Glow' showed an average greenhouse germination rate of 70% to 75%, while `Aurea' yielded 46% germination. A subpopulation of seedlings from each genotype accession was grown further outdoors in containers for a full season to ascertain seedling vigor and development. The vigor of 1-year-old seedlings, as measured by dry weight of canopy growth, for progeny derived from `Aurea' (0.70 g) and `Crimson Pygmy' (0.93 g) was significantly less than var. atropurpurea (1.20 g) and `Rose Glow' (1.33 g). These results demonstrate that popular japanese barberry cultivars express disparate reproductive potential that, after further study, may be correlated with invasive potential. Some popular commercial cultivars may pose significantly less ecological risk than others.

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Mary Hockenberry Meyer, Cydnee Van Zeeland, and Katherine Brewer

-term viability adds to the biological knowledge of this species. From an invasive plant view, long-term seed viability is a negative trait that can be a long-term problem. It is interesting to note that we found significant germination from some plants at certain