Water Chestnut (Trapa natans L.) Infestation in the ... - SUNY Oneonta

Effects of 2,4-D Herbicide: Photos
The 2,4-D herbicide was applied to beds of healthy water chestnut that are seen in
Figure 4 to be lush, dense and bright green. Figures 5 and 6 document the degradation of
the water chestnut over three weeks time after the application. Roots turned brown and
lost all rigidity and form, petioles began to disassociate from rosettes, leaves lost color
and form, and plants began to sink in the water column. Four weeks after the application,
the plants were observed growing new shoots from degraded, old roots (Figure 7). All
photos were taken by W. Eyres in 2006 on site.
FIGURE 4. Chestnut bed prior to FIGURE 5. Bed two weeks after
herbicide application; plants dense and green. Application; plants begin to sink and degrade
FIGURE 6. Three weeks post application; FIGURE 7. Four weeks; plants showing regrowth
plants brown almost completely disassociated of new shoots from old roots
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