Abstract
Chen, S., and S. Liu. Effects of tillage and crop sequence on parasitism of Heterodera glycines juveniles by Hirsutella spp. and on juvenile population density. 2007. Nematropica 37:93-106. The effect of tillage on parasitism of Heterodera glycines second-stage juvenile (J2) by the nematophagous fungi Hirsutella rhossiliensis and/or Hirsutella minnesotensis and on J2 population density was investigated at four sites in soybean-corn rotation and one site in soybean monoculture in Minnesota. Soil samples were taken at planting, in midseason, and at harvest in 2002, at planting, 1 and 2 months after planting, and at harvest in 2003, and 2 weeks and 2 months after planting, and at harvest in 2004. Heterodera glycines J2 were extracted, and the number and percentage of J2 parasitized by Hirsutella were determined. No significant differences in the percentages of parasitized J2 were observed between conventional tillage (CT) and no-tillage (NT) at all sampling dates, except that the percentage of J2 parasitized in NT was significantly higher than in CT during the soybean-growing season in 2003 at one site in the soybean-corn annual rotation. The percentage of J2 parasitized by Hirsutella was higher in soybean fields than in corn fields, and the percentage of J2 parasitized in midseason was generally higher than that at planting and harvest. Growing a resistant soybean cultivar in the preceding year reduced the percentage of J2 parasitized by Hirsutella in the following season. Conventional tillage increased the mid-season J2 population density during 2002-2004 soybean-growing seasons as compared with NT at two of the five sites.
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Claims 6
Claim · model-written summary
J2 parasitism did not differ significantly between conventional tillage and no tillage at most sampling dates.
- Taxon
- soybean
Glycine maxe0 - Treatment
- conventional tillage (CT)e1
- Interactor
- J2e1pest
- Outcome
- percentages of parasitized J2e1
- Direction
- No significant differencese1
- Comparator
- no-tillage (NT)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in soybean-corn rotation”
e1“No significant differences in the percentages of parasitized J2 were observed between conventional tillage (CT) and no-tillage (NT) at all sampling dates, except”
Claim · model-written summary
At one site in 2003, no tillage had significantly more parasitized J2 than conventional tillage.
- Taxon
- soybeanGlycine maxe0
- Treatment
- NTe1
- Interactor
- J2e1pest
- Outcome
- percentage of J2 parasitizede1
- Direction
- highere1
- Qualifier
- one sitee0
- Comparator
- CTe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during the soybean-growing season in 2003 at one site in the soybean-corn annual rotation”
e1“the percentage of J2 parasitized in NT was significantly higher than in CT”
Claim · model-written summary
Hirsutella parasitized a higher percentage of J2 in soybean than corn fields.
- Taxon
- soybeanGlycine maxe0
- Interactor
- J2e0pest
- Second interactor
- Hirsutella
.png?width=60)
Hirsutellae0biocontrol_agent - Outcome
- percentage of J2 parasitized by Hirsutellae0
- Direction
- highere0
- Comparator
- corn fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.png?width=500)
Verbatim
e0“The percentage of J2 parasitized by Hirsutella was higher in soybean fields than in corn fields”
Claim · model-written summary
J2 parasitism was generally higher at midseason than planting and harvest.
- Taxon
- soybeanGlycine maxe0
- Interactor
- J2e1pest
- Outcome
- percentage of J2 parasitizede1
- Direction
- highere1
- Comparator
- planting and harveste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in soybean fields”
e1“the percentage of J2 parasitized in midseason was generally higher than that at planting and harvest”
Claim · model-written summary
Growing a resistant soybean cultivar the prior year reduced Hirsutella parasitism of J2 the following season.
- Taxon
- soybeanGlycine maxe0
- Material
- resistant soybean cultivare0
- Interactor
- J2e0pest
- Second interactor
- HirsutellaHirsutellae0biocontrol_agent
- Outcome
- percentage of J2 parasitized by Hirsutellae0
- Direction
- reducede0
- Qualifier
- in the following seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing a resistant soybean cultivar in the preceding year reduced the percentage of J2 parasitized by Hirsutella in the following season”
Claim · model-written summary
Conventional tillage increased midseason J2 density relative to no tillage at two sites during 2002–2004 soybean seasons.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Conventional tillagee0
- Interactor
- J2e0pest
- Outcome
- mid-season J2 population densitye0
- Direction
- increasede0
- Qualifier
- at two of the five sitese0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage increased the mid-season J2 population density during 2002-2004 soybean-growing seasons as compared with NT at two of the five sites”
The same questions in other papers
tillage · pest · Glycine max (soybean)Positive and negative results
11 papers in the same direction as this paper · 14 in the opposite direction
- positive
- positive
- positive
22 papers more in this group
See all 26 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.