A Field Test of Selected Insects and Pathogens for Control of Waterhyacinths PDF Download
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Author: Eugene E. Addor Publisher: ISBN: Category : Aquatic plants Languages : en Pages : 68
Book Description
During the 1975 growing season a field experiment was begun on Lake Concordia, La., to test the potential effectiveness of selected organisms as control agents against waterhyacinths, Eichhornia crassipes (Mart.) Solms. Floating frames, each approximately 2 m square, were anchored on the lake in open water and planted with locally growing waterhyacinths. Sixty of these frames (plots) were selected for treatment with various combinations of two insects (Arzama densa Walker and Neochetina eichhorniae Warner) and two fungi (Acremonium zonatum (Sawada) Gams and Cercospora rodmanii Conway) in a random block factorial arrangement with four replications per treatment, and four frames were designated as control (no-treatment) plots. All plots were weighed at 2-week intervals throughout the growing season, flowering stalks were counted, and plant heights were measured at each weighing date. Observations were also made on insect and pathogen populations on the plots during the season. Preliminary indications are that significant reductions in the growth rate or total accumulation of waterhyacinth mass in the test plots were not achieved by any of the treatment combinations during the first season's tests, but the potential for some of the treatments to effect the desired control began to emerge during the second year.
Author: Eugene E. Addor Publisher: ISBN: Category : Aquatic plants Languages : en Pages : 68
Book Description
During the 1975 growing season a field experiment was begun on Lake Concordia, La., to test the potential effectiveness of selected organisms as control agents against waterhyacinths, Eichhornia crassipes (Mart.) Solms. Floating frames, each approximately 2 m square, were anchored on the lake in open water and planted with locally growing waterhyacinths. Sixty of these frames (plots) were selected for treatment with various combinations of two insects (Arzama densa Walker and Neochetina eichhorniae Warner) and two fungi (Acremonium zonatum (Sawada) Gams and Cercospora rodmanii Conway) in a random block factorial arrangement with four replications per treatment, and four frames were designated as control (no-treatment) plots. All plots were weighed at 2-week intervals throughout the growing season, flowering stalks were counted, and plant heights were measured at each weighing date. Observations were also made on insect and pathogen populations on the plots during the season. Preliminary indications are that significant reductions in the growth rate or total accumulation of waterhyacinth mass in the test plots were not achieved by any of the treatment combinations during the first season's tests, but the potential for some of the treatments to effect the desired control began to emerge during the second year.
Author: Dana R Sanders (Sr) Publisher: ISBN: Category : Languages : en Pages : 80
Book Description
The large-scale operations management test is being conducted in the state of Louisiana, using Cercospora rodmanii Conway, Neochetina eichhorniae Warner, and Sameodes albiguttalis (Warren) for the control of water hyacinth. In-house and contractor groups will be collecting data on the project following the rationale set forth in this test plan. The plan includes a pilot study to determine whether Cercospora is capable of becoming epiphytotic on a large scale from the introduction of small quantities of inoculum, efficacy tests of a commercially prepared formulation of Cercospora, tests of effects of combinations of Cercospora - Neochetina and Cerospora - Sameodes, and supportive studies aimed at enhancing the effects of these agents. Provisions are also made for the extrapolation of results to the development of a management strategy for operational use of effective combinations of agents in areas where water hyacinth is a problem. (Author).
Author: Eugene E. Addor
Author: Eugene E. Addor
Author: Eugene E. Addor
Author: Dana R Sanders (Sr)
Author: Edward O. Gangstad
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