Phoma stem canker on honeyberry/haskap plants, powdery mildew & more

This past August I sent a couple of dead Aurora yearlings to the University of Minnesota Plant Disease Clinic for diagnosis. Planted in early June, they leafed out but died by late July.

Phoma stem canker on Aurora honeyberry/haskap Aug. 6, 2019

Result: “Phoma stem canker was detected at the crown level. Consider if there are any ways that mechanical wounds could be occurring at this area of the stem; thus creating an entry point for disease.” The fee for this diagnosis was $45.

Read more about this fungus and other honeysuckle diseases at

If the canker is detected early enough on a branch it can be pruned away and disposed of into the garbage. (Be sure to disinfect pruners).

Also known as black-leg, phoma stem canker affects a range of other plants such as canola and broccoli

Yellowing leaves on this plant in early August indicate something is amiss, but I didn’t send it in for diagnosis.
Powdery mildew on Keiko honeyberry/haskap leaves August 7, 2019

Powdery mildew afflicts some of our honeyberry/haskap leaves during mid to late summer but the plants bounce back and produce fruit the next year.

Tent caterpillars, August 3, 2019

We have not had more than a few bushes at a time afflicted with tent caterpillars while in other areas this pest can devastate a forest or orchard during the peak years of its cycle. More info:

Forest Tent Caterpillars on Berry Smart Blue (Czech #17) leaf June 30, 2012

About honeyberrylady

Growing honeyberries and other cold hardy fruit (dwarf sour cherries, saskatoons, currants, gooseberries, aronia, elderberry, and goji) in zone 3a, just north of the headwaters of the Mississippi River in Minnesota, USA.
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