I’ve yet to see a brand canker without that brown central coloration. You’ll find tiny, raised, reddish-purple bumps on the canes, a little less than half the size of a grain of rice.Īs these little spots begin to mature into their fruiting bodies, they develop a brown or black color.Ĭaused by Coniothyrium wernsdorffiae, these have a similar reddish color as the brown variety, also found on the canes, but these cankers quickly develop a brown center. Roses are susceptible to three types of canker:īrown canker is caused by Cryptosporella umbrina. I’ve encountered them during early springtime pruning, either by discovering old cankers, or noticing new ones taking hold. Interestingly, cankers often cause the most trouble during the colder periods of the year, making them a bit more difficult to notice than other diseases. Photo by Florida Division of Plant Industry, Florida Department of Agriculture and Consumer Services,, via CC 3.0
0 kommentar(er)
