German Mosquito Control Association
The German Mosquito Control Association, in German Kommunale Aktionsgemeinschaft zur Bekämpfung der Schnakenplage (KABS) is an association founded in 1976, with its seat in Speyer (Germany), by 98 bodies (towns, parishes, counties including Baden-Wuerttemberg, 2013 figure) along the upper Rhine to combat the problem of gnats in the area. Gnat refers here to the biting midge rather than the mosquito. Of the 33 species found in the upper Rhine area over 80% are Aedimorphus vexans. It is not uncommon to find 50 thousand Aedes eggs in a single square meter of river bank in a flood plain area. KABS employees carry out gnat control on a 300 km stretch of the Rhine between Bingen and Offenburg over an area of around six thousand square kilometers. There use exclusively protein produced by Bacillus thuringiensis israelensis (BTI). This work is carried out, depending on the current water levels, accessibility of the terrain and statutory requirements, either on foot or by helicopter. In both cases the biologically active ingredient, which is not allowed to contain living bacteria, is applied in areas of water where the larvae breed. The agent must then be ingested by the larvae, as only then is it activated and leads to a breakup of intestinal cells, and thus extremely selectively kills the organisms.
Distribution
The active substance is stirred with water and distributed with a backpack spray by workers on foot, or applied as an ice granulate from the air by helicopter. In 2007, 260 tons of the agent were spread by the two available helicopters and 250 helpers, on 84 action days of which 47 were supported by helicopter. This involved 33 thousand working hours and 270 thousand kilometers. The 400 thousand Euros this cost bring local residents a reduction of 99% in the gnat population compared to untreated areas. The time of application is critical for the efficiency of the treatment. Gnats lay their brood in hollows above the normal water level, and they are activated when flood levels are reached. Treatment must follow within a week.
In addition, residents of the KABS areas are supplied with CULINEX tablets free of charge in order to treat smaller water sources such as water butts and garden ponds which do not contain fish. A single water butt can be a source of several hundred gnats.
Association
The president of the association is Paul Schädler, scientific director of KABS is Norbert Becker. It is financed by subscription (membership fees of the 98 affiliated municipal areas). For a city such as Wiesbaden (population 570,000) this means a fee of 45 thousand euro per year.
International activity
KABS also makes its expertise internationally available. Under its English name of German Mosquito Control Association it supports the world-wide gnat control programme of the WHO.[1]
Current developments
As flood protection is becoming ever more prevalent, the near future will see an increase in low lying land. These planned flood areas will be further brooding ground for gnats and will require additional effort which will probably require a third helicopter. Fundamental Critique These extensive control measures represent an ecological problem, which will be dealt with in the article Stechmücken.
References
- ↑ WHO publications: Guideline Specifications for Bacterial Larvicides for Public Health Use, S. 32
Literature
- Norbert Becker, Paul Glaser, Hermann Magin: Biologische Stechmückenbekämpfung am Oberrhein, (Festschrift) 20 Jahre Kommunale Aktionsgemeinschaft zur Bekämpfung der Schnakenplage, 1996, ISBN 3-00-000584-6 (Biological Gnat Control on the Upper Rhine (publication) 20 years of a communal action association to combat the gnat plague, 1996)
- Norbert Becker: Biological control of mosquitoes: management of the Upper Rhine mosquito population as a model programme in Jørgen Eilenberg, Heikki M. T. Hokkanen (Hrsg.): An ecological and societal approach to biological control, Springer, 2006, S. 227–245, ISBN 978-1-4020-4320-8 (Print) ISBN 978-1-4020-4401-4 (Online)