... arboricides for “chemical thinning”. Relative to the conventional mechanical thinning, this technique is far less time and resource demanding (K 1968). In the past, arboricides were ... erefore, thinning measures can be more intensive and can be repeated at longer time intervals (K 1968; J, V 1966). Dead standing trees maintain higher relative air hu-midity in the ... used arboricides containing arsenic and diluted in oil products (V et al. 1972).When chemical thinning is used, it is inevitable that the phenomenon of increased danger of insect pest...