Walk through the wood is good for the soul and body. Adults like to breathe fresh forest air and enjoy fauna and flora. Children like to play hideouts or climb up the tree. But it could be unhealthy because some of the forest trees are treated with insecticides.
Although forest protection is contained in the Federal Law, and environmental-friendly interventions, such as the use of pesticides, are generally prohibited. But in some cases the law allows exceptions. For example, when it comes to fighting beetles or bug beetles that eat in wood. In order to prevent these insects, and thus the damage to logs, the logging of softwood logs in the woods is partially insecticide. Barrels, high-quality tree logs, which can not be done at the time of insect take-off in the middle of April from the forest, have been hit and are therefore pile up on so-called. The most commonly used insecticide is cypermethrin.
According to the Baudirektion of Canton Zurich, responsible for such exemptions, in Meilen district in 2018, 3.8 decilitres of cytoctothion neurotoxin was used. This corresponds to an amount of about 3.8 liters of commercial herbicide. In the Horgen district, it was about half. Explanation: In the Horgen district, less logs had to be stored in the same period.
Alexander Singeisen is a forester who is responsible for the municipalities of Meilen, Uetikon, Männedorf, Oetwil and Stäfa. "Actually, I do not want to use poison in the woods," he says. If possible, he leaves the soot that goes down to February. "So they can dry up before the insects fly in the spring, and they are no longer attractive for growing ground." However, because of its capacity, throwing is often not possible, says the woodsman. Then the insecticide is also used in its territory. It must also take into account economic interests. "After all, we use domestic raw material."
In 2018, about 800 cubic meters of trees were treated with cypermethrin in the forests of five communities – equivalent to 40 wood trucks. In the same year a total of 5000 cubic meters of wood was collected. So far this year there were about 100 cubic meters of trunk, so five trucks were loaded. The order is given to Singeisen always a buyer of the diary. "He tells me what wood supplies should be treated."
One of the wood buyers from Pfannenstiel is saw mill Rolf Unholz AG in Greifensee. "Every year we buy about 400 cubic meters of timber from this area," says Rolf Unholz. It affirms that it denies the use of insecticide in appropriate forests. Soaps containing insects are worth up to 50 percent less, he explains. "Because of that, I have treated all coniferous woodwork, whose pants can not be crossed or removed in time."
"Actually, I do not want to use poison in the woods."Alexander Singeisen, Suburb Meilen, Uetikon, Männedorf, Oetwil and Stäfa
That could be something, because the entrepreneur says his wood will be offered partly in March. "Then, however, discharging brings nothing more." It is not possible for him to bring all the hips from flight to noise in mid-April, and thus to "safety," says Unholz. He does not have enough space on his farm. "Storage of logs in other places until being used would be too expensive." He only raised those cases close to the water body, so the use of cypermethrin is impossible.
Poisonous for fish
Every use of insecticide requires permission from Baudirektion Canton Zurich. Pesticide is used only when all alternative options are not practical, says Wolfgang Bollack, spokesman for Baudirektion. The Forestry Department attaches great importance to compliance with water protection regulations. Since insecticide is poisoned for fish and fish, the distance between 20 and 50 meters of water must be respected. Spraying would only be carried out by people who would have the right permission. Management of the construction site records the coordinates, type and amount of resources and amount of wood treated with insecticide. According to Budirektion, the scattered bark is later used as an energy tree. "Such ovens are equipped with appropriate filtering systems."
But sometimes the theory and practice differ, because obviously not every spit bark end up in a kiln with a filtration system. Before the Unholz sawmill removes the treated logs from the forest, they are mechanically removed on the spot. "We do this in the woods because we do not have a logger at the farm," says Rolf Unholz. The treated bark is then left on the forest soil. It's not a problem: "Those places are always outside the water protection zones, and over time the spray loses its effect." The director confirmed that the effect of cypermethrin decreases over time. However, he points out that access to the saw is an exception. "Large processors, which take over most of the wood, usually have dumbbells," says spokeswoman Wolfgang Bollack. There, the trunk was easier to detect.
Martin Forter is director of the Association of Environmental Physicians (Aefu), who intervenes, among other things, against the use of pesticides. "He is fierce," he says when he hears that in certain cases a bark is treated with a cypermethrin in the woods. "The bore belongs to the burners, not the forests," says geographer, who specializes in chemical products and waste. Cypermethrin is one of the most dangerous substances in the water. This would damage the aquatic world at extremely low concentrations. "We talk about picograms, that is, about trillions of grams." It would need special equipment for any measurements in this area.
According to Aef, insecticides such as cypermethrin generally have nothing in the environment and certainly nothing in the woods. "Every insecticide or pesticide is problematic because the forest is a fragile ecosystem," says Martin Forter. Insecticide not only damages insects, but also has a toxic effect on bees. As much as the poison is dangerous when children or dogs fall on processed logs, the geographer can not judge. "That certainly is not good." (Zurich list)
Created on: 02.07.2019, 16:58 hours