Aquatic Plant Control Research Program. Vol A-96-2. Phenological Studies toImprove Hydrilla Management

摘要

To improve hydrilla management, the U.S. Army Corps of Engineers' Aquatic PlantControl Research Program supports studies in four main technology areas-Biological Control, Chemical Control, Ecological, and Simulation Technologies. The Biological Control Technology area is investigating tungal pathogens and insects as potential biocontrol agents for controlling hydrilla populations. The Chemical Control Technology area examines concentration and exposure times required for aquatic herbicides and evaluates their use on an operational level. The Ecological Technology area examines the environmental parameters that determine the distribution and abundance of hydrilla. The Simulation Technology area has been developing growth models for hydrilla, as well as predictive models for specific control techniques used on the species, such as herbicides, harvesting, or triploid grass carp. The success of any management technique for nuisance aquatic plants is increased when applied at the optimal time. Phenological studies provide managers with the information needed to identify weak points in the life cycles of target plants, during which control measures can be applied with optimum effect. Another objective in studying the phenological cycles of target species is to identify biological parameters that affect management strategies.