Abstract
The degree of control of purple nutsedge (Cyperus rotundus L.) provided by Bactra verutana Zeller, a native moth, was evaluated for various stress conditions. Two, three, or four weekly infestations each with three larvae per live shoot, reduced purple nutsedge dry weight an average 77% compared with an average 55% for one infestation. Eight weekly infestations reduced plant dry weight 98%. Neither caging of the larvae on the plants nor osmotic stress with NaCl to -8 bars influenced larval efficacy, but nitrogen deficiency did reduce the effect of the larvae about 75%. Purple nutsedge had no effect on the dry weight of cucumber (Cucumis sativus L., 'Straight Eight') after 1 month, whether larvae were or were not present. Purple nutsedge did reduce the plant dry weight of okra (Abelmoschus esculentus (L.) Moench, 'Clem- son Spineless') 64%, but repeated (eight) weekly infestations of larvae gave a plant weight of okra equal to that of okra grown without purple nutsedge. Purple nutsedge reduced the bulb and root dry weight of onion (Allium cepa L., 'Big Val- ley') 37%, but repeated weekly infestations of larvae gave onion growth equal to that of onion grown without purple nutsedge.
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Claims 10
Claim · model-written summary
Two to four weekly larval infestations reduced purple nutsedge dry weight by an average 77%, compared with 55% for one infestation.
- Taxon
- Purple Nutsedget0
- Treatment
- Two, three, or four weekly infestations each with three larvae per live shoote1
- Interactor
- Bactra verutana
.jpg?width=60)
Bactra verutanat0biocontrol_agent - Outcome
- purple nutsedge dry weighte1
- Direction
- reducede1
- Value
- 77%e1
- Qualifier
- an average 55%e1
- Comparator
- one infestatione1
- Setting
- Greenhouset0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e1“Two, three, or four weekly infestations each with three larvae per live shoot, reduced purple nutsedge dry weight an average 77% compared with an average 55% for one infestation”
Claim · model-written summary
Eight weekly larval infestations reduced purple nutsedge plant dry weight by 98%.
- Taxon
- Purple Nutsedget0
- Treatment
- Eight weekly infestationse2
- Interactor
- Bactra verutanaBactra verutanat0biocontrol_agent
- Outcome
- plant dry weighte2
- Direction
- reducede2
- Value
- 98%e2
- Setting
- Greenhouset0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e2“Eight weekly infestations reduced plant dry weight 98%”
Claim · model-written summary
Caging the larvae on the plants did not influence larval efficacy.
- Taxon
- Purple Nutsedget0
- Treatment
- caging of the larvae on the plantse3
- Interactor
- larvaee3biocontrol_agent
- Outcome
- larval efficacye3
- Setting
- Greenhouset0
Not reportedComparatorDirection
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e3“Neither caging of the larvae on the plants nor osmotic stress with NaCl to -8 bars influenced larval efficacy”
Claim · model-written summary
Osmotic stress with NaCl to -8 bars did not influence larval efficacy.
- Taxon
- Purple Nutsedget0
- Treatment
- osmotic stress with NaCl to -8 barse3
- Interactor
- larvaee3biocontrol_agent
- Outcome
- larval efficacye3
- Setting
- Greenhouset0
Not reportedComparatorDirection
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e3“Neither caging of the larvae on the plants nor osmotic stress with NaCl to -8 bars influenced larval efficacy”
Claim · model-written summary
Nitrogen deficiency reduced the effect of the larvae on purple nutsedge by about 75%.
- Taxon
- Purple Nutsedget0
- Treatment
- nitrogen deficiencye5
- Interactor
- larvaee5biocontrol_agent
- Outcome
- effect of the larvaee5
- Direction
- reducee5
- Value
- 75%e5
- Setting
- Greenhouset0
Not reportedComparator
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e5“nitrogen deficiency did reduce the effect of the larvae about 75%”
Claim · model-written summary
Purple nutsedge had no effect on cucumber dry weight after 1 month, whether or not larvae were present.
- Taxon
- cucumber
Cucumis sativuse6 - Treatment
- Purple nutsedgee6
- Interactor
- Purple nutsedgee6weed
- Outcome
- dry weighte6
- Qualifier
- after 1 monthe6
- Setting
- Greenhouset0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e6“Purple nutsedge had no effect on the dry weight of cucumber (Cucumis sativus L., 'Straight Eight') after 1 month, whether larvae were or were not present”
Claim · model-written summary
Purple nutsedge reduced okra plant dry weight by 64%.
- Taxon
- okra
.jpg?width=60)
Abelmoschus esculentuse7 - Treatment
- Purple nutsedgee7
- Interactor
- Purple nutsedgee7weed
- Outcome
- plant dry weighte7
- Direction
- reducee7
- Value
- 64%e7
- Setting
- Greenhouset0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e7“Purple nutsedge did reduce the plant dry weight of okra (Abelmoschus esculentus (L.) Moench, 'Clem- son Spineless') 64%”
Claim · model-written summary
Repeated weekly larval infestations gave okra plant weight equal to okra grown without purple nutsedge.
- Taxon
- okraAbelmoschus esculentuse7
- Treatment
- repeated (eight) weekly infestations of larvaee7
- Interactor
- larvaee7biocontrol_agent
- Outcome
- plant weighte7
- Comparator
- okra grown without purple nutsedgee7
- Setting
- Greenhouset0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e7“but repeated (eight) weekly infestations of larvae gave a plant weight of okra equal to that of okra grown without purple nutsedge”
Claim · model-written summary
Purple nutsedge reduced onion bulb and root dry weight by 37%.
- Taxon
- onion
Allium cepae1 - Treatment
- Purple nutsedgee1
- Interactor
- Purple nutsedgee1weed
- Outcome
- bulb and root dry weighte1
- Direction
- reducede1
- Value
- 37%e1
- Setting
- Greenhouset0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e1“Purple nutsedge reduced the bulb and root dry weight of onion (Allium cepa L., 'Big Val- ley') 37%”
Claim · model-written summary
Repeated weekly larval infestations gave onion growth equal to onion grown without purple nutsedge.
- Taxon
- onionAllium cepae1
- Treatment
- repeated weekly infestations of larvaee1
- Interactor
- larvaee1biocontrol_agent
- Outcome
- onion growthe1
- Comparator
- onion grown without purple nutsedgee1
- Setting
- Greenhouset0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Biocontrol of Purple Nutsedge by Bactra verutana Zeller in a Greenhouse”
e1“but repeated weekly infestations of larvae gave onion growth equal to that of onion grown without purple nutsedge”
The same questions in other papers
infection · growth · Abelmoschus esculentus (okra)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
infection · growth · Allium cepa (onion)Positive and negative results
1 paper in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 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.