Using high-quality breeding types within agriculture, intense fertilization, a high stand density and biocides the ability of soil ecosystems to regulate themselves is always more reduced. 

Indicators for urban grounds are top soil consolidations, humus poverty and a mixture of rich coarse skeleton, gravel, loam and sand, in which urban areas predominate calcareous substrates. The result is a strong reduction of the microbial activity in the soil of city trees.
This leads to undesirable side effects towards non-target organisms among them we find several antagonists as the balance between harmful organisms and antagonists is disturbed.



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