Soybean leaf miner: Dispersion and dispersal

Soybean leaf miner vertical canopy dispersion: Vertical dispersion of soybean leaf miners, Odontata horni, within two rows of soybean. The green bars represent individual soybean plants and their heights based on node number (y axis). The circles represent the location of soybean leaf miners by soybeaSoybean leaf miner vertical canopy dispersion: Vertical dispersion of soybean leaf miners, Odontota horni, within two rows of soybean. The green bars represent individual soybean plants and their heights based on node number (y axis). The circles represent the location of soybean leaf miners by soybean node. The circle size is the relative number of soybean leaf miners on that node.

There is very little information about the soybean leaf miner in general, and even less is known about its geographic range and spatial distribution within soybean fields. However, a recent outbreak in a field in western Iowa gave us a idea of the pattern of this insect within fields. In August 1, 2002 a quick survey of this individual field revealed 28.8 soybean leaf miners per sweep in a plant-stand density of 6 plants/ft. Mapping the location of soybean leaf miners on individual plants (as shown in the figure) illustrates what we saw. Our observations indicated that soybean leaf miners were somewhat regularly dispersed within rows and highly aggregated in the upper canopy.