North Rhine-Westphalia: Red alarm level due to oak beetle!
North Rhine-Westphalia: Red alarm level due to oak beetle!
In North Rhine-Westphalia there are alarming news for garden owners and forest owners. The oak beetle, a dreaded pest, is increasingly spreading and causes considerable damage to oak stands. As RUHR24, the regions in Münsterland are particularly reported East Westphalia, Rhineland and Siegerland affected. If the infestation is not recognized in time, an affected tree can infect up to ten more trees next year.
The oak beetle leaves striking D-shaped drill holes in the bark and a characteristic black mucus track, which indicates the infestation. Experts recommend removing infested trees by mid -May to prevent the pest. Typical signs of an infestation include the black mucus flow, the dead bark and dead branches in the tree crown.
biological characteristics and distribution
The larvae of the oak beetle have the ability to eat under the bark of the trees and hibernate there for up to two years. In addition to the oak beetle, the oak beetle can also lead to the damage to oak stands. This beetle puts feeding on the wood and can thus affect the growth of the trees.
Exact monitoring and early intervention are crucial to curb the spread of the oak beetle. According to lwf bavaria also rarer beetle species in certain areas, which can add additional strain the oaks again. Their harmfulness can have serious consequences for forest management.
behaviors and life cycle
The life cycle of the oak beetle shows interesting biological properties. In July and August, the females remove up to 1,000 eggs on the bark of feeding trees, which are covered with yellow -brown after -wool. After hatching, which is typically at the end of April, the caterpillars initially develop in the eggs and then begin to feed on the buds. These caterpillars can be up to 7.5 cm long and almost finger-thick and can be found primarily on oaks, but also on other leafy and even conifers.
The caterpillars have a wide range of food and can also fall back on other tree species such as larch and pine if there is a lack of food. This increases the risk of further damage to the forest stocks, especially in times when trees are weakened by other environmental factors.
experts hope for better working conditions in the coming months, since the soils tend to be drier than in the previous year. This could facilitate the implementation of measures to combat these pests and secure the oak stocks.
| Details | |
|---|---|
| Quellen | |