USACE Buffalo monitoring for hydrilla on Cayuga Lake.
• Assessment of plant species diversity and abundance: Annual rake-toss data provide an indication of hydrilla abundance (estimated biomass) as well as overall plant species diversity. Conduct surveys pre- and post-treatment each year using grids established using the point-intercept method. Pretreatment surveys should be performed in mid- to late July, and post-treatment surveys should be performed in late September through early November. If new locations of hydrilla are identified, increase the grid size to facilitate a larger search area for detection. Assess the rate of plant expansion to inform the control strategy. Record the following metrics: native and rare plant species presence and abundance; and hydrilla plant status, include whether plants are injured, and whether there is re-growth or formation of tubers or turions (i.e., a dormant bud produced by the above-sediment portion of the plant, capable of growing into a new plant when released from the parent plant).
1Systemic herbicides are absorbed by vegetative tissues (foliage, roots) and translocated to other parts of the plant.