Susceptibility of commercial cultivars to boxwood blight

20 Feb

From NCSU:

Susceptibility to box blight (Cylindrocladium buxicola = Cylindrocladium pseudonaviculatum) was evaluated for twenty three varieties of boxwood (Buxus spp.) at the Mountain Horticultural Crops Research and Extension Center in Mills River, NC during summer 2012. Disease assessments were performed based on a modified Horsfall-Barratt scale including percent leaf area diseased and percent stem streaking. The results shown below are based on the final disease assessment.

Our results indicate a wide range in susceptibility of Buxus spp. to the boxwood blight pathogen; however B. sempervirens types were more susceptible in general (a 2011 publication reported ‘Justin Brouwers’ to actually fall within the B. sempervirens cluster). The varieties listed as tolerant had minimal lesion development caused by C. buxicola. It is important to note that some boxwood varieties are limited in their optimal plant hardiness zones; make sure to look up specific growing requirements for each variety before recommending them in your area.

Boxblight susceptibility

 

(click on the picture for better view)

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