Disease

Clubroot galls

Evaluation of clubroot disinfectants

Bleach (sodium hypochlorite) was most effective in killing clubroot (Plasmodiophora brassicae) spores at concentrations above 1.7%. Spray Nine was almost as effective, while 5 other products achieved greater than 95% control. Sanitation of equipment, vehicles, scouting tools and footwear is an important part of preventing…

R. solani disease ratings

Soybean disease reaction and yield loss to Rhizoctonia solani

Seedling blight and root rot in soil-inoculated Rhizoctonia solani plots decreased soybean stand establishment by 48% and reduced yield by 52% compared to control plots with low levels of R. solani. No significant differences in disease severity, nodulation or yield loss were observed among the…

lygus bug on faba bean pod copy

Faba bean seed damage by lygus bug and chocolate spot

Lygus bug and chocolate spot disease can damage faba bean seed. Research found both organisms are widespread in central and southern Alberta. Seed damage occurs independently of each other, and is primarily caused by lygus bug. Seed damage caused by lygus bug (Lygus spp.) or…

clubroot canola roots

Clubroot spore load reduced by 90% with a two-year canola break

A break from susceptible canola of at least 2 years resulted in more than 90% reduction in clubroot pathogen resting spores compared to continuous canola or a 1-year break. Clubroot resistant varieties grown with a 2- to 4-year break yielded 32 to 76% higher than…

severe blackleg in canola field

Blackleg severity and yield loss in canola

For every 1-unit increase in disease severity rating on a scale of 1 to 5, yield loss in a susceptible variety was 17.2% and pod loss was 13.0%. Disease severity was lower and seed yield was 120% to 128% higher in the moderately resistant to…

clubroot galls

Basamid fumigant is a potential tool for clubroot control

Basamid (dazomet) soil-applied fumigant was effective against clubroot and seedling blight in canola. Basamid appears to have good potential as a tool to maintain canola yield and reduce the spread of clubroot where the disease is concentrated, usually at field entrances. Clubroot, caused by the…