Collar Rot on Italian Alder Trees in California Caused by <i>Phytophthora siskiyouensis</i>

Fig. 5. Mean lesion lengths on stems of three species of alder trees that were wounded and inoculated with P. siskiyouensis 3 weeks after inoculation; bars represent ± one standard deviation.



Image from Plant Health Progress article:
Collar Rot on Italian Alder Trees in California Caused by Phytophthora siskiyouensis