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Home > Disease

Disease

Diagnosing spots and twig dieback on a Japanese plum

September 4, 2020 by Jonas Dupuich

Somewhere in the mid-1950s, my grandfather, Leo Dupuich, acquired a number of bonsai from a local landscaper and bonsai enthusiast named Jim Miyasaki. When my teenage father saw the trees, one stuck out to him – a Japanese plum. My dad cared for the tree for a number of years before giving it to my […]

Tracking down banding symptoms in black pine

November 5, 2019 by Jonas Dupuich

I was surprised to find yellow banding on a few of my pines this fall. It’s not something I’ve seen much of in my garden over the years so it caught my attention when small yellow patches appeared. Yellow banding on black pine needles The overall health of the needles is good, and the damage […]

Diagnosing root rot in black and red pine bonsai

October 4, 2019 by Jonas Dupuich

For years, I’ve spotted unhealthy shoots on black and red pines and wondered about the cause. Unhealthy foliage on black pine The main symptoms are discoloration – primarily yellow foliage – and deformed needles. The problem affects young trees and old trees alike. On more refined trees, I see short, twisty, needles like in the […]

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