Researchers of Applied Plant Research (PPO), a part of Wageningen University and Research Centre are involved in intense cooperation with various European partners for the purpose of durable scab control in organic apple cultivation. Apple scab is caused by a fungus (Venturia inaequalis) and is a major economic issue in all areas where apples are grown. The disease mainly develops in cool, rainy conditions in the spring, and the resulting spots can make apples difficult to sell. Furthermore, early leaf loss generates indirect damage by reducing the vitality of the trees.
The researchers studied the effects of yucca extracts in the laboratory as well as in the orchard. When examining apple seedlings in the laboratory, researchers found that the extract had both a preventive and a curative effect. The extract achieves the former by preventing the fungus from budding and thereby from infecting the plants. A curative effect is also active until at least one day after the plant is infected by the fungus.
The extract was shown to be promising in practice as well during field tests in a PPO orchard in Randwijk, the Netherlands, and another orchard in Denmark. The effects were found to be as good as those of a low dose of copper. While organic growers in Europe currently depend primarily on copper, sulphur and lime sulphur to fight scab, copper is no longer allowed in the Netherlands, and the European Commission has decided to ban the use of copper throughout Europe.
This study took place under the auspices of the EU project Repco (project nr 501452), which stands for Replacement of Copper in Organic Production of Grapevine and Apple in Europe, and is partly financed by the 6th Framework programme of the European Commission. The goal of this project is to find alternatives for copper in the organic production of grapevine and apples.
Jac Niessen | alfa
How much drought can a forest take?
20.01.2017 | University of California - Davis
Plasma-zapping process could yield trans fat-free soybean oil product
02.12.2016 | Purdue University
For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.
According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
23.01.2017 | Health and Medicine
23.01.2017 | Physics and Astronomy
23.01.2017 | Process Engineering