6,030 research outputs found
Prevention of vole damage in organic pomiculture
Vole damage is one of the most difficult phytosanitary problems to solve in organic
pomiculture. A survey conducted in 2002 among German fruit growers showed that 90
% of the farms suffered from this damage. The water vole (A. terrestris) revealed to be
the main pest in 80 % of the orchards. 61 % of the farmers announced a high interest in
the development of new preventive and control methods. To stop immigration of voles
into orchards a mechanical barrier system was developed and tested at two study sites
in Baden-Wuerttemberg and Rhineland-Palatinate. At each location barrier systems with
wire mesh (mesh size 10 mm) and polyolefine-foil were installed arround two 0.7 ha
study plots. Two unprotected plots were used as a control. The barriers were anchored
20 cm deep into the soil. 30 cm of the material protruded over the surface. Automatic
gates were installed for the entrance of vehicles. 4 persons needed approximately one
day to install a barrier around a plot with the size of 1 ha. Not only was the wire mesh
cheaper than the foil, it was permeable for wind, water and small beneficial organisms.
After installing the barrier systems, voles were removed from all plots. Snap trap boxes
were ranged along the outside of the barriers to catch migrating voles. A total of 33
water voles and 1263 common voles (M. arvalis) were captured on both study sites from
October 2002 to November 2003. During the study period a total of 5 water voles
immigrated into the first control plot and 6 settled into the other plot. Four water voles
entered two of the barrier protected plots by using fresh mole galleries. The other
protected plots stayed free from water voles. Simultaneous to the field studies, trials in
two enclosures were carried out in Muenster. The barriers kept all water voles outside
the protected plots. The results showed a high efficacy of the developed barrier system
How expensive is vole damage?
Vole species, especially Arvicola terrestris and Microtus arvalis cause significant economical damage in organic pomiculture by gnawing the root system of trees. The importance of voles as pest organisms is well known. Nevertheless, the estimation of financial loss caused by voles is difficult for German fruit growers. We conducted a survey among organic fruit growers to get data on kind and amount of annual damage. Using the available publications and official statistics we calculated economical values of organic apple trees for different types of orchard processing and tree ages. Furthermore we calculated the number of trees lost due to voles in one year
Abwehr von Wühlmausschäden im ökologischen Obstbau mit Hilfe von Migrationsbarrieren
Sowohl im integrierten als auch im ökologischen Obstbau gelingt eine dauerhafte Abwehr von Wühlmausschäden mit den zur Verfügung stehenden Mitteln nur unzureichend. Nach den Ergebnissen einer Umfrage, für die 279 Rückmeldungen ausgewertet wurden, sind 90 % der deutschen Obstbaubetriebe von Wühlmausschäden betroffen. Hauptschadensverursacher ist die Schermaus (Arvicola terrestris), die für Schäden auf 80 % der Flächen verantwortlich gemacht wird
Abwehr von Wühlmausschäden im ökologischen Obstbau
Wühlmausschäden sind weit verbreitet und gehören zu den nur schwer lösbaren Pflanzenschutzproblemen im ökologischen Landbau. Nach einer Umfrage des Institutes für
Nematologie und Wirbeltierkunde der Biologischen Bundesanstalt für Land- und Forstwirtschaft (BBA), im Jahre 2002 waren 90 % der befragten Obstbaubetriebe von Wühlmausschäden betroffen. Als Hauptschadensverursacher treten vor allem die Schermaus (Arvicola terrestris ), auch große Wühlmaus genannt, und die Feldmaus ( Microtus arvalis) auf. Mit den wenigen zur Verfügung stehenden Mitteln erreicht aber nur ein Bruchteil der ökologisch wirtschaftenden Betriebe einen akzeptablen Bekämpfungserfolg. Von Wissenschaft und Industrie werden viele Anstrengungen unternommen, um bekannte Abwehrmaßnahmen zu verbessern und neue Präparate sowie Methoden zu entwickeln. Dazu werden die Lebensweise und in letzter Zeit vor allem das sehr komplexe Verhalten von Wühlmäusen intensiv untersucht. In diesem Merkblatt werden die derzeit möglichen und angewandten Bekämpfungs- und Abwehrmaßnahmen für den ökologischen Obstbau sowie deren Erfolgsaussichten vorgestellt. Verschiedene Hinweise sollen helfen, die Wühlmausabwehr effizienter zu gestalten. Das Merkblatt richtet sich in erster Linie an Obstbauern und Obstbauberater. Aber auch Baumschulbetriebe, Gemüsebauern, kommunale Einrichtungen und Gartenbesitzer werden Anregungen für die Lösung von Wühlmausproblemen finden
Migrationsbarrieren gegen Wühlmäuse – Erfahrungen aus 3 Jahren Praxiseinsatz
In der landwirtschaftlichen Praxis wird die Wühlmausbekämpfung vorrangig mit Fraßködern, Fallen und Begasungsgeräten durchgeführt.
Um die Besiedlung wühlmausfreier Flächen zu verhindern werden seit 2002 Migrationsbarrieren in der obstbaulichen Praxis erfolgreich erprobt
Fatal lymphoproliferation and acute monocytic leukemia-like disease following infectious mononucleosis in the elderly
Three elderly patients are reported, in whom serologically confirmed recent infectious mononucleosis is followed by fatal lymphoproliferation (case 1), by acute monocytic leukemia (case 2), and by acute probably monocytic leukemia (case 3)
A comparative history of Department of Defense Management reform from 1947 to 2005
MBA Professional ReportThe purpose of this MBA Project is to document and analyze the history of management reform within the Department of Defense from 1947 through the present day based on the annual reports of the Secretaries of Defense to the Congress. Since its inception in 1947, the Department of Defense has undergone nearly constant management reforms. It appears that each administration attempts to introduce some type of management reform agenda to improve the Department of Defense business processes and incorporate recent management ideas from the business community. Some of the changes are real and significant; others are changes in name only. Through analysis of annual reports of the Secretaries of Defense, a compilation of significant management reforms was created for each secretary. These reforms were analyzed and compared to one another to identify both general trends and truly unique changes in management practices. Ultimately, this analysis will help distinguish the relative significance in the management reform effort of both the individual secretaries and the specific reform initiatives.http://archive.org/details/acomparativehist1094510068US Marine Corps (USMC) authors.Approved for public release; distribution is unlimited
Single microwave photon detection in the micromaser
High efficiency single photon detection is an interesting problem for many
areas of physics, including low temperature measurement, quantum information
science and particle physics. For optical photons, there are many examples of
devices capable of detecting single photons with high efficiency. However
reliable single photon detection of microwaves is very difficult, principally
due to their low energy. In this paper we present the theory of a cascade
amplifier operating in the microwave regime that has an optimal quantum
efficiency of 93%. The device uses a microwave photon to trigger the stimulated
emission of a sequence of atoms where the energy transition is readily
detectable. A detailed description of the detector's operation and some
discussion of the potential limitations of the detector are presented.Comment: 8 pages, 5 figure
Wie teuer sind Wühlmausschäden im ökologischen Obstbau?
Durch das Benagen von Baumwurzeln verursachen Schermäuse (Awicola terrestris) und Feldmäuse (Microtus awalis) bedeutende Schäden im Obstbau
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