Reaction of Winter Wheat Cultivars to Artificially Inoculated Seed-borne Pink Snow Mold.

Iriki, Norio; Nakajima, Takashi; Kawakami, Akira

doi:10.1270/jsbbs.52.231

Cited by 4 publications

(2 citation statements)

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“…In grasses and cereals, different species and varieties in resistance to M. nivale show variation (Pulli et al, 1996). A correlation between resistant to M. nivale and different species of the snow mold fungi Typhula has been found in grasses and cereals (Iriki et al, 2002). Although correlation between resistances to different winter stress factors has been found in grasses (Nagasima and Abe, 1997), since ranking of genotypes according to their resistance is not consistent when studying different winter stress factors (Proncuzuk and Zagdanska, 1993).…”

Section: Discussionmentioning

confidence: 99%

Response of Bentgrass Cultivars to Microdochium nivale Isolates Collected from Golf Courses

Chang¹,

Chang²,

Jung³

2011

The Plant Pathology Journal

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Pink snow mold, caused by Microdochium nivale, is a major disease on cool season turfgrasses in golf courses in northern Unites States. The relative susceptibility of 17 commercial cultivars of three bentgrass species (creeping, colonial and velvet bentgrass) to Microdochium nivale and the aggressiveness of M. nivale eight isolates obtained from infected turfgrasses on golf courses in Wisconsin were evaluated under controlled conditions. For the field trial, susceptibility of 2 year-old 12 commercial bentgrass cultivars was evaluated after inoculating three M. nivale isolates in the fields. There were significant differences in disease severities among the three bentgrass species, particularly between tetraploids (creeping and colonial) and diploid (velvet) species, and among cultivars within each species, indicating that there are varying levels of susceptibility in species and cultivars to M. nivale. Host resistance by days of cold hardening was confirmed, by detecting the resistance by 30 days of cold hardening treatments. In field trial, susceptibility of 12 bentgrass cultivars was highly correlated to the results obtained from growth chamber experiments. The positive correlation of the susceptibility between growth chamber experiments and field trials demonstrates that the growth chamber method is a useful technique for saving time, space and labor to evaluate efficiently pink snow mold susceptibility of bentgrass cultivars. This study could be applied to evaluating susceptibility of bentgrass to pink snow mold and also predicting a prospective evaluation of bentgrass cultivars to pink snow mold in fields in a breeding program.

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Section: Discussionmentioning

confidence: 99%

Response of Bentgrass Cultivars to Microdochium nivale Isolates Collected from Golf Courses

Chang¹,

Chang²,

Jung³

2011

The Plant Pathology Journal

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“…The roles of planting date (Serenius et al ., ), varietal resistance (Bruehl, ; Amono, ; Gossen et al ., ; Iriki et al ., , ), timing of fertiliser application (Daamen et al ., ), chemical and biological controls of snow moulds (reviewed in Tronsmo et al ., ) and seeding density (Pahkala et al ., , ; Hakala & Pahkala, ) in affecting winterkill have been studied. However, the extent to which weeds affect winterkill in winter wheat has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Winter annual grassy weeds increase over‐winter mortality in autumn‐sown wheat

2013

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Over-winter mortality, that is, winterkill, reduces cereal crop competitive ability and yield. While management and environmental variables are known to affect winterkill, the extent to which weeds contribute to increased winterkill is largely unknown. Winter annual weeds may increase winterkill through resource competition and by increasing incidence of and damage from plant pathogens that cause winterkill. We evaluated the impact of summer annual (Avena fatua) and winter annual (Bromus tectorum) weeds on the over-winter survival rate of winter wheat over three winters, during which plots were covered with snow. Pink snow mould (Microdochium nivale), a winterkill pathogen known to infect B. tectorum and winter wheat, was common in wheat stands. In weed-free treatments, mortality rates were initially near zero, but increased by nearly 45% in each subsequent winter, presumably due to an increase in snow mould disease in continuously cropped winter wheat. Whereas A. fatua infestation had no impact on crop survival rates, winter wheat survival in B. tectorum-infested plots was 50% less than the weed-free control in the second and third years of this study. Among B. tectorum-infested plots, winter wheat over-winter survival declined with increasing weed seed produced in the previous summer. Overall, this study demonstrated that winter annual weed infestations can reduce crop stand densities below replanting thresholds by reducing fall-sown cereal winter survival. The effects of winter annual weeds on winter wheat may be meditated by increased proliferation of snow mould disease.

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