NPost5184Attach2 - Summary of the Regional Cogongrass...

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Summary of the Regional Cogongrass Conference Mobile, Alabama November 7 th - 8 th , 2007 This summary represents a compilation of the most pertinent information for managing native ecosystems. It is not an inclusive summary. To gain information on all the presentations and find more useful information, refer to the proceedings to the conference available at . A few messages on cogongrass control were repeated throughout the conference. These include: - Cogongrass control is best achieved through a multifaceted approach including herbicides, mechanical treatment and the introduction of desirable, competitive plant species - Use glyphosate, imazapyr, or a mixture of both, depending on surrounding vegetation - Fall applications are necessary, spring applications are good insurance - Plan on three years of herbicide application for effective control - Mowing or burning and then treatment of new growth can reduce the amount of herbicide required - Application of glyphosate is effective for seed prevention Gregory E. MacDonald University of Florida, IFAS Cogongrass: The Plant's Biology, Distribution, and Impacts in the Southeastern US Reproduction: - Spreads both clonally through rhizomes and by seed - Produces extensive rhizomes (can comprise over 60% of total plant biomass, fresh weights as high as 40 tons per hectare) - Most rhizomes are found 6-10 inches below ground, but can be found as deep as 4 feet - Rhizomes are allelopathic, and also interfere with the growth of other plants by penetrating roots, bulbs and tubers - Not self-compatible, and must out-cross to produce viable seed (populations originating from rhizomes only spread clonally until they reach close proximity to a genetically different population) - Produces over 3000 seeds per plant - Flowering generally occurs in the late winter/early spring, but disturbance can stimulate flowering year-round - Seeds are wind disseminated, and though they can travel long distances, generally move ~15 m - There is a rapid decline in seed viability over time, and a complete loss of viability after one year
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- Seed is able to invade and grow in established native plant communities. Seed establishment is facilitated by tillage and burning Habitat - Infests diverse habitats - Adapted to poor soils and drought conditions, and appears to grow best in soils with acidic pH, low fertility and low organic matter
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NPost5184Attach2 - Summary of the Regional Cogongrass...

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