Associate Professor of Weed Ecology and Management
School of Food and Agriculture
205 Roger Clapp Greenhouse
Degree: Ph.D., University of Wisconsin, Madison, 1997
Research Topic: Ecologically-based weed management; Weed seedbanks; Weed seed fate; Seed predation; Annual weed population dynamics; Physical weed control; Organic farming systems
Overview of Research: Weeds are the foremost production problem for organic farmers. Cultivation can provide acceptable levels of weed control, however, efficacy is independent of seedling density. Thus, the density of surviving weeds is directly proportional to the initial seedling density, which, in turn, is directly proportional to the weed seedbank. An ecological approach to weed management considers the key life-history transitions that can affect debiting (germination, decay, predation) as well as crediting (seed production) functions of the weed seedbank. While any one process is not expected to be sufficient, acceptable levels of weed control may be achieved through the cumulative effects of many small stresses, i.e., “Many Little Hammers.”
Kolb, L.N. and E.R. Gallandt (2012). Weed management in organic cereals: advances and opportunities. Organic Agriculture 2:23-42.
Harrison, S. and E.R. Gallandt (2012). Behavioural studies of Harpalus rufipes De Geer: an important weed seed predator in Northeastern US agroecosystems. International Journal of Ecology 2012, Article ID 846546, 6 pages (doi:10.1155/2012/846546).
Kolb, L.N., E.R. Gallandt, and E.B. Mallory (2012). Impact of spring wheat planting density, row spacing, and mechanical weed control on yield, grain protein, and economic return in Maine. Weed Science 60:244-253.
Kruidhof, M., E. Gallandt, E. Haramoto, and L. Bastiaans (2010). Selective weed suppression by cover crop residues: effects of seed mass and timing of species’ sensitivity. Weed Research 51:177-186.
Kolb, L.N., E.R. Gallandt, and T. Molloy (2010). Improving weed management in organic spring barley: physical weed control vs. interspecific competition. Weed Research 50: 597-605.
Mirsky, S.B., E.R. Gallandt, D.A. Mortensen, W.S. Curran, and D.L. Shumway (2010). Reducing the germinable weed seedbank with soil disturbance and cover crops. Weed Research 50:341-352.
Liebman, M. and E.R. Gallandt (1997) Many little hammers: ecological management of agricultural weeds. In Ecology in Agriculture. Academic Press, San Diego, CA. 291-343.