Douglas fir needles 6139M

Descrição:

Description: English: Douglas Fir (Pseudotsuga menziesii) needles attacked by two bioagressors : 1) the somewhat inflated bases of the needles colored with violet are galls caused by the Douglas fir needles gall midge (Contarinia pseudotsugae s.l.) 2) the brownish/reddish, dessicated needle tips are probably caused by a fungal pathogen (maybe the Swiss Needle Cast, Phaeocryptopus gaeumannii). These last symptoms could also be caused by physiological problems. Location : Belgium. Date: 6 September 2016, 21:53:58. Source: Own work. Author: Gilles San Martin.