Effects of Azoxystrobin Application Rate and Treatment Interval on the Control of <i>Rhabdocline</i> <i>pseudotsugae</i> on Douglas-fir Christmas Trees

Fig. 3. Douglas-fir Christmas trees derived from the Lincoln National Forest. Infected tree (left) has one age class of needles; resistant tree (right) has three age classes of needles.



Image from Plant Health Progress article:
Effects of Azoxystrobin Application Rate and Treatment Interval on the Control of Rhabdocline pseudotsugae on Douglas-fir Christmas Trees