Résistances aux botrytis sur fraise

Im Frühsommer 2017 wurden in einer Machbarkeitsstudie 66 Botrytis-Stämme aus Erdbeerfrüchten isoliert und auf Fungizidresistenzen untersucht. Bei über 50 Prozent aller Stämme konnten fünf oder mehr Resistenzen nachgewiesen werden

Wetterderivate: Ein Instrument im Risikomanagement für die Landwirtschaft?

The risks associated with farming activities are likely to increase in the future. It, therefore, appears worthwhile to analyse new risk management instruments. This paper investigates weather derivatives for which a market has already emerged in the USA. Contrary to traditional financial derivatives, their payoff is determined by future weather events, such as temperature or precipitation. Thus, they hedge risks which result from climate. Since they address production risks they are complementary to instruments that hedge price risks, such as future markets. The objective of the paper is to evaluate the economic impacts of weather derivatives and to assess their potential as farm level instruments of risk management. After outlining the main characteristics and the functioning of weather derivatives and their emergence, emphasis is placed on model calculations to quantify farm level impacts. The potato farm is used as a case study. Empirical data on yields and weather variables are taken from an experiment station of the Chamber of Agriculture at Hanover, Germany. After studying the relationship between yields and weather variables, the findings are used to design an option based on a precipitation index. Stochastic simulation is then used to assess the effects on the probability distribution of revenues. The results show that weather derivatives can be useful instruments of risk management in agriculture. Since there is still a lack of knowledge with respect to some of their economic impacts, further research is needed. This refers to the choice of suitable commodities and weather indexes, the contractual design and methodological aspects of pricing and of integrating weather derivatives into the risk management of farms. Last but not least, the question has to be answered, as to which partners would be willing to accept the risk that farmers intend to reduce by means of weather derivatives.weather derivatives, weather risk, risk management, stochastic simulation, Financial Economics, Risk and Uncertainty,

Pflanzenschutz in Forst und Wald

059 - Ausbringung von Pflanzenschutzmitteln mit dem Hubschrauber in Wäldern - unter Berücksichtigung von NaturschutzaspektenMareike Güth, Axel Buschmann 060 - Zur Umweltwirkung von Pflanzenschutzmitteln in WäldernMatthias Stähler, Nadine Bräsicke, Katrin Möller 061 - Ökologische Begleituntersuchung zum Einsatz des Borkenkäfer-Fangsystems Trinet® PMartin Karabensch, Martin Schönfeld-Simon 062 - Auswirkungen von Insektiziden und Fraßereignissen in Kiefernwäldern auf die ParasitoidenzönoseBianca Kühne, Nadine Bräsicke 063 - Natürliche mikrobielle Antagonisten und modellbasierte Risikobewertung des Eichenprozessionsspinners (Thaumetopoea processionea) im KlimawandelRegina G. Kleespies Ute Koch, Paula Halbig, Jörg Schumacher, Marcel Mühlfeit, Pavel Plašil, Gabriela Lobinger, Katrin Möller, Horst Delb 064 - Vorkommen der Dothistroma-Nadelbräune im Nordostdeutschen TieflandPaul Heydeck, Christine Dahms, Uwe Lange, Toralf Pfannenstill, Christian Hohm 065 - Entwicklung eines Standardverfahrens zur Prüfung der Widerstandsfähigkeit von Schwarz-Erle (Alnus glutinosa (L.) Gaertn.) gegenüber Phytophthora alni, P. multiformis und P. uniformis (Resistenztest)Juliette Schwan, Corina Junker, Christin Siewert, Sabine Werres,Michael Kube 065a - Zur Schädigung von Bergahorn verursacht durch Cryptostroma corticale, dem Erreger der Ahorn-Rußrindenkrankheit in Baden-WürttembergJörg Grüner, Kilian Kist, Franziska Klaiber, Laurin Wanner059 - Application of Plant Protection Substances in Forrests by Helicopter - under Consideration of Nature Conservation AspectsMareike Güth, Axel Buschmann 060 - Environmental impact of plant protection products in pine forestsMatthias Stähler, Nadine Bräsicke, Katrin Möller 061 - Ecological investigation on effects of the attract and kill system Trinet® PMartin Karabensch, Martin Schönfeld-Simon 062 - Effects of insecticides and feeding damage on parasitoids in pine forestsBianca Kühne, Nadine Bräsicke 063 - Natural microbial antagonists and model-based risk assessment of the oak processionary moth (Thaumetopoea processionea) in climate changeRegina G. Kleespies Ute Koch, Paula Halbig, Jörg Schumacher, Marcel Mühlfeit, Pavel Plašil, Gabriela Lobinger, Katrin Möller, Horst Delb 064 - Occurrence of Dothistroma needle blight in the northeastern German lowlandsPaul Heydeck, Christine Dahms, Uwe Lange, Toralf Pfannenstill, Christian Hohm 065 - Development of a standard method for testing the resistance of black alder (Alnus glutinosa (L.) Gaertn.) to Phytophthora alni, P. multiformis and P. uniformis (resistance test)Juliette Schwan, Corina Junker, Christin Siewert, Sabine Werres,Michael Kube 065a - Damage of sycamore caused by fungal infections with Cryptostroma corticale in Baden-WürttembergJörg Grüner, Kilian Kist, Franziska Klaiber, Laurin Wanne