Abstract
Abstract In order to study the deposition of infective spores of barley powdery mildew in Denmark during the spring, young barley plants were placed at various sites in 1977 and exposed to ambient conditions for several hours when air mass movements in south to north directions had been predicted. The exposed plants became infected at the southernmost exposure sites on each exposure day: April 28 and May 5 and 6. Only a slight decrease in the number of barley mildew colonies was noted in the south to north direction at distances varying from about 30 to 100 km from the southernmost site, after which an abrupt decrease to zero was recorded at the next more northerly site. Possible causes for the sudden cessation in spore deposition are discussed. If a sudden decrease to zero of deposited conidia generally takes place at different Iaütudes in Denmark in the spring, then the sum of deposited conidia during the period late April to early May might well exhibit a gradual decrease in a south to north direction corresponding to the earlier reported gradual decrease in the number of mildew colonies in barley fields in the period late May to early June. Key Words: air trajectoriesdistant dispersalepidemiology
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Claims 4
Claim · model-written summary
Exposed barley plants became infected with powdery mildew at the southernmost exposure sites on each exposure day.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Interactor
- barley powdery mildewe2pathogen
- Outcome
- became infectede0
- Qualifier
- southernmost exposure sitese0
- Setting
- denmarkt0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“young barley plants”
e2“barley powdery mildew”
t0“denmark”
e0“The exposed plants became infected at the southernmost exposure sites on each exposure day”
Claim · model-written summary
Only a slight decrease in the number of barley mildew colonies was noted south to north at distances of about 30 to 100 km from the southernmost site.
- Taxon
- barleyHordeum vulgaree1
- Interactor
- barley mildewe0pathogen
- Outcome
- number of barley mildew coloniese0
- Direction
- slight decreasee0
- Qualifier
- about 30 to 100 km from the southernmost sitee0
- Setting
- denmarkt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“young barley plants”
t0“denmark”
e0“Only a slight decrease in the number of barley mildew colonies was noted in the south to north direction at distances varying from about 30 to 100 km from the southernmost site”
Claim · model-written summary
After the 30-100 km stretch, the number of barley mildew colonies dropped abruptly to zero at the next more northerly site.
- Taxon
- barleyHordeum vulgaree1
- Interactor
- barley mildewe0pathogen
- Outcome
- number of barley mildew coloniese0
- Direction
- abrupt decrease to zeroe0
- Qualifier
- next more northerly sitee0
- Setting
- denmarkt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“young barley plants”
t0“denmark”
e0“Only a slight decrease in the number of barley mildew colonies was noted in the south to north direction at distances varying from about 30 to 100 km from the southernmost site, after which an abrupt decrease to zero was recorded at the next more northerly site”
Claim · model-written summary
The authors hypothesize that the sum of deposited conidia from late April to early May might decrease gradually in a south to north direction if the sudden decrease to zero occurs generally.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- sum of deposited conidiae0
- Direction
- gradual decreasee0
- Setting
- denmarkt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“young barley plants”
t0“denmark”
e0“the sum of deposited conidia during the period late April to early May might well exhibit a gradual decrease in a south to north direction”