The boxwood borer (Cydalima perspectalis) is a very voracious pest. If the boxwood is not defended against it with all possible means, it can become completely defoliated and then die. Primary rock flour should be able to stop this. But what exactly does it do to the borer?
How does primary rock flour affect boxwood moths?
The finely ground primary rock powder must be spread over the entire boxwood foliage. Then it works immediately and in two ways. The powder filmprevents egg layingOf larvae that have already hatchedglues togethertheeating tools so that they eventually die.
What exactly is primary rock powder?
Primitive rock flour is also known as rock or stone flour. It is amineral materi althat is obtained by grinding rock. It is rich in minerals and trace elements. Sincedifferent types of rock are used for production, there are different primary rock flours that differ in composition and can also have a different pH value.
Why is primary rock powder used in addition to algae lime?
Algae lime helps well against boxwood moths. However, when used frequently, it can greatly increase the pH value of the soil until it is no longer suitable for the boxwood. If slightly acidic primary rock powder is used in between, thepH value increase can be compensated again.
What do I have to consider when using primary rock powder?
So that primary rock powder works against boxwood borers, but at the same time does not harm the boxwood, you should note the following:
- sprinkle after rain (better adhesion)
- alternatively boxwood leaves with water hosemoisturize
- spread only athin film
- cover the entire book with it
- shift every two weeksrenew
- spread preventatively after years of infestation
- e.g. after an early pruning in March
Is the use of primary rock powder ecologically justifiable?
Although primary rock flour has a purely natural origin, its use is not without problems. Because when the stones are mined, entireareas of land are destroyedIn addition, it has to be transporteda long distance to usTherefore, its use should be carefully weighed and limited to small quantities.
Tip
Use a mister for more even application
The fine primary rock powder can never be spread completely evenly, even with the steadiest hand. However, thickly applied areas prevent photosynthesis. It is better to use a special powder atomizer for spreading, which is commercially available for exactly such purposes.
