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10-2 10-' 10ยป 101 102 103 104 1 0= 106 107 Dispersal distance (m)

Figure 2.7 Estimated approximate range of dispersal distances for 14 processes that disperse weed seeds.

from its original location. Thus, vigilance and prompt eradication while the population is small are the best defenses against spread within a field. During eradication, care should be taken to avoid spreading the new weed around the field with tillage and cultivation implements.

Although wind, birds, and mammals occasionally move weeds between fields, most spread of weeds between fields is probably the result of human activity. Most of the discussion that follows focuses on dispersal of weeds between fields and regions, areas in which substantial management options exist.

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