Abstract
The sensitivity of wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal) populations to triadimefon for single spore-derived isolates collected from triadimefon-treated and -untreated wheat (cvs. Absolvent and Borden) fields in the Annapolis Valley (AV) and Colchester County (CC) of Nova Scotia, Canada, was studied in vitro. Results indicated that the populations of the fungus from the AV, where the fungicide has been used intensively, had higher mean EC$\sb{50}$ values and higher frequencies of isolates resistant to triadimefon than those from CC. The wheat cv. Absolvent was more favourable for the development of resistant isolates of the fungus than the cv. Borden. For both cultivars, the mean EC$\sb{50}$ values and frequencies of resistant isolates were higher for populations collected from triadimefon-treated fields compared to those from untreated fields. In the study of build-up of resistance, sensitivity tests were performed on powdery mildew isolates collected in 1992 from the AV and CC fields of the wheat cv. Absolvent before, and two and six weeks after triadimefon application. Results revealed that exposing powdery mildew populations to the selection pressure of triadimefon resulted in an increase in the EC$\sb{50}$ values of populations and in the frequency of resistant isolates within each population. In 1991, the competitive abilities of randomly selected triadimefon-sensitive (S) and -resistant (R) isolates of powdery mildew from treated and untreated fields of the AV in mixed isolate inoculations (75:25, 50:50, 25:75) were tested in the absence of triadimefon on the wheat cv. Absolvent. In 1992, the 50:50 ratio was used in studying the competition between R and S isolates that were collected from treated fields in the AV. Results indicated that, in the absence of triadimefon, the mean EC$\sb{50}$ values of mixtures of various R:S ratios decreased significantly after five generation cycles. Resistant isolates were less fit (less competitive) than sensitive ones in the absence of triadimefon.
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Claims 9
Claim · model-written summary
Mildew populations from the Annapolis Valley, where triadimefon is used intensively, had higher mean EC50 values than those from Colchester County.
- Taxon
- wheat
Triticum aestivume0 - Interactor
- Erysiphe graminis DC. f.sp. tritici E. Marchal
Blumeria graminis f. sp. triticie0pathogen - Outcome
- mean EC$\sb{50}$ valuese1
- Direction
- highere1
- Comparator
- those from CCe1
- Setting
- AVe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e1“the populations of the fungus from the AV, where the fungicide has been used intensively, had higher mean EC$\sb{50}$ values and higher frequencies of isolates resistant to triadimefon than those from CC”
Claim · model-written summary
Mildew populations from the Annapolis Valley had a higher frequency of triadimefon-resistant isolates than those from Colchester County.
- Taxon
- wheatTriticum aestivume0
- Interactor
- Erysiphe graminis DC. f.sp. tritici E. MarchalBlumeria graminis f. sp. triticie0pathogen
- Outcome
- frequencies of isolates resistant to triadimefone1
- Direction
- highere1
- Comparator
- those from CCe1
- Setting
- AVe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e1“the populations of the fungus from the AV, where the fungicide has been used intensively, had higher mean EC$\sb{50}$ values and higher frequencies of isolates resistant to triadimefon than those from CC”
Claim · model-written summary
The wheat cultivar Absolvent was more favourable than Borden for the development of resistant isolates.
- Taxon
- wheatTriticum aestivume2
- Material
- cv. Absolvente2
- Interactor
- funguse2pathogen
- Outcome
- development of resistant isolatese2
- Direction
- more favourablee2
- Comparator
- cv. Bordene2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The wheat cv. Absolvent was more favourable for the development of resistant isolates of the fungus than the cv. Borden”
Claim · model-written summary
For both cultivars, mean EC50 values were higher in populations from triadimefon-treated fields than in those from untreated fields.
- Taxon
- wheatTriticum aestivume0
- Treatment
- triadimefon-treated fieldse3
- Outcome
- mean EC$\sb{50}$ valuese3
- Direction
- highere3
- Comparator
- untreated fieldse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e3“For both cultivars, the mean EC$\sb{50}$ values and frequencies of resistant isolates were higher for populations collected from triadimefon-treated fields compared to those from untreated fields”
Claim · model-written summary
For both cultivars, the frequency of resistant isolates was higher in populations from triadimefon-treated fields than in those from untreated fields.
- Taxon
- wheatTriticum aestivume0
- Treatment
- triadimefon-treated fieldse3
- Outcome
- frequencies of resistant isolatese3
- Direction
- highere3
- Comparator
- untreated fieldse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e3“For both cultivars, the mean EC$\sb{50}$ values and frequencies of resistant isolates were higher for populations collected from triadimefon-treated fields compared to those from untreated fields”
Claim · model-written summary
Exposure to triadimefon selection pressure increased the mean EC50 values of the mildew populations.
- Taxon
- wheatTriticum aestivume5
- Treatment
- selection pressure of triadimefone4
- Interactor
- powdery mildewe4pathogen
- Outcome
- EC$\sb{50}$ values of populationse4
- Direction
- increasee4
- Comparator
- beforee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“exposing powdery mildew populations to the selection pressure of triadimefon resulted in an increase in the EC$\sb{50}$ values of populations and in the frequency of resistant isolates within each population”
e5“the wheat cv. Absolvent before, and two and six weeks after triadimefon application”
Claim · model-written summary
Exposure to triadimefon selection pressure increased the frequency of resistant isolates within each mildew population.
- Taxon
- wheatTriticum aestivume5
- Treatment
- selection pressure of triadimefone4
- Interactor
- powdery mildewe4pathogen
- Outcome
- frequency of resistant isolatese4
- Direction
- increasee4
- Comparator
- beforee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“exposing powdery mildew populations to the selection pressure of triadimefon resulted in an increase in the EC$\sb{50}$ values of populations and in the frequency of resistant isolates within each population”
e5“the wheat cv. Absolvent before, and two and six weeks after triadimefon application”
Claim · model-written summary
In the absence of triadimefon, mean EC50 values of mixtures of resistant and sensitive isolates decreased significantly over five generation cycles.
- Taxon
- wheatTriticum aestivume0
- Material
- mixtures of various R:S ratiose6
- Outcome
- mean EC$\sb{50}$ valuese6
- Direction
- decreasede6
- Qualifier
- in the absence of triadimefone6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e6“in the absence of triadimefon, the mean EC$\sb{50}$ values of mixtures of various R:S ratios decreased significantly after five generation cycles”
Claim · model-written summary
Resistant isolates were less fit than sensitive isolates in the absence of triadimefon.
- Taxon
- wheatTriticum aestivume0
- Material
- Resistant isolatese7
- Outcome
- fite7
- Direction
- lesse7
- Comparator
- sensitive onese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat powdery mildew (Erysiphe graminis DC. f.sp. tritici E. Marchal)”
e7“Resistant isolates were less fit (less competitive) than sensitive ones in the absence of triadimefon”
The same questions in other papers
triadimefon · pest · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
triadimefon · disease · Triticum aestivum (wheat)Positive and negative results
2 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.