Abstract
Seven lettuce cultivars were transplanted into a field infested with Fusarium oxysporum f. sp. lactucae (causal agent of Fusarium wilt of lettuce) in August and September of 2014, 2015, and 2016. For moderately susceptible cultivars, 1- or 2-week differences in planting date had a significant effect on severity of Fusarium wilt. In growth chamber experiments, cultivars of moderate susceptibility were maintained in a growth chamber under cool conditions (23/18°C), and a subset of plants was transferred to a warm chamber (33/23°C) for 1 week, at weekly intervals after transplanting. Plants exposed to high temperatures at 2 and 3 weeks after transplanting (WAT) had more severe symptoms of Fusarium wilt than those exposed at 4 WAT. In October 2015, April 2016, August 2016, and August 2017, moderately susceptible cultivars were planted into field soil with an inoculum density gradient. Moderately susceptible cultivars were little affected by Fusarium wilt where inoculum densities of F. oxysporum f. sp. lactucae were <125 per gram of soil, even in warm planting windows. Adjusting planting dates to avoid high temperatures during a critical stage of growth and maintaining low inoculum density in soil can contribute to management of Fusarium wilt in moderately susceptible lettuce cultivars.
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Claims 4
Claim · model-written summary
One- or two-week planting-date differences significantly affected wilt severity in moderately susceptible cultivars.
- Taxon
- Lettuce
Lactuca sativat0 - Outcome
- severity of Fusarium wilte0
- Qualifier
- moderately susceptible cultivarse0
- Setting
- planting datee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For moderately susceptible cultivars, 1- or 2-week differences in planting date had a significant effect on severity of Fusarium wilt.”
t0“Lettuce”
Claim · model-written summary
Heat exposure at two and three weeks after transplanting yielded more severe wilt symptoms than exposure at four weeks.
- Taxon
- LettuceLactuca sativat0
- Treatment
- high temperatures at 2 and 3 weeks after transplanting (WAT)e0
- Outcome
- symptoms of Fusarium wilte0
- Direction
- more severee0
- Comparator
- those exposed at 4 WATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants exposed to high temperatures at 2 and 3 weeks after transplanting (WAT) had more severe symptoms of Fusarium wilt than those exposed at 4 WAT.”
t0“Lettuce”
Claim · model-written summary
Moderately susceptible cultivars were little affected below 125 pathogen units per gram of soil, even during warm planting windows.
- Taxon
- LettuceLactuca sativat0
- Interactor
- F. oxysporum f. sp. lactucae
Fusarium oxysporum f. sp. lactucaee0pathogen - Outcome
- little affected by Fusarium wilte0
- Value
- <125 per gram of soile0
- Qualifier
- even in warm planting windowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderately susceptible cultivars were little affected by Fusarium wilt where inoculum densities of F. oxysporum f. sp. lactucae were <125 per gram of soil, even in warm planting windows.”
t0“Lettuce”
Claim · model-written summary
Avoiding high temperatures at a critical growth stage and maintaining low soil inoculum density can aid wilt management.
- Taxon
- lettuceLactuca sativae0
- Outcome
- Adjusting planting dates to avoid high temperatures during a critical stage of growth and maintaining low inoculum density in soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adjusting planting dates to avoid high temperatures during a critical stage of growth and maintaining low inoculum density in soil can contribute to management of Fusarium wilt in moderately susceptible lettuce cultivars.”
The same questions in other papers
transplanting · Fusarium · Lactuca sativa (garden lettuce)Positive and negative results
1 in the opposite direction
- positive
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.