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The close quantitative interrelation between the reaction of birch to abiotic stress "springÐsummer droughts# "the degree to which the yearly radial increment of trees decreases# and entomoresistance has been established[ Tree stands that were heavily defoliated by gypsy moth showed a much stronger reaction to the droughts which preceded the outbreaks by the decrease in their radial increment than those weakly defoliated by this phytophagous insect[ The reaction of trees to the abiotic stress is regarded as the key factor that controls the drop in their entomoresistance during outbreaks of gypsy moth in woods damaged by anthropogenic e}ects[

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