Abstract
Summary The legume cavalcade, Centrosema pascuorum , is used extensively as a cover crop and as a component of conservation agriculture systems. It is also an attractive rotation or cover crop for the management of root-knot nematodes (RKN; Meloidogyne spp.) as it is a non-host. RKN are persistent pests that are well known to be difficult to control. However, the mechanisms governing the non-host status of cavalcade is unknown. The current study established that cavalcade leaves are toxic to RKN as either aqueous extracts or soil amendments. Bioassays conducted using Meloidogyne javanica showed that a 90% concentration of aqueous extract derived from 1-month-old cavalcade leaves (89 mg crude extract ml −1 ) suppressed nematode hatch (82.9%) and killed infective second-stage juveniles of M. javanica (85.3%). Soil amendments with 1% (w/w) of 1-month-old cavalcade leaves (0.99 mg crude extract g −1 soil) also provided effective control of M. javanica in the glasshouse on okra. One-month-old leaves appeared more effective than 2- or 3-month-old leaves. The soil amendments had no adverse phytotoxic effect on okra seed germination. Our study demonstrates the potential for using cavalcade leaves or extracts to manage RKN. This may be due to the nematicidal activity of the various compounds in the leaves, such as flavonoids, phenols and terpenoids, which should be further assessed.
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Claims 6
Claim · model-written summary
Aqueous extract of 1-month-old Centrosema pascuorum leaves at 90% concentration suppressed Meloidogyne javanica hatch (82.9%).
- Taxon
- Centrosema pascuorum
Centrosema pascuorumt0 - Treatment
- a 90% concentration of aqueous extract derived from 1-month-old cavalcade leavese1
- Interactor
- Meloidogyne javanicaMeloidogyne javanicat0pest
- Outcome
- nematode hatche2
- Direction
- suppressede2
- Value
- 82.9%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica”
e1“a 90% concentration of aqueous extract derived from 1-month-old cavalcade leaves”
e2“suppressed nematode hatch (82.9%)”
Claim · model-written summary
Aqueous extract of 1-month-old Centrosema pascuorum leaves killed infective second-stage juveniles of Meloidogyne javanica (85.3%).
- Taxon
- Centrosema pascuorumCentrosema pascuorumt0
- Treatment
- a 90% concentration of aqueous extract derived from 1-month-old cavalcade leavese1
- Interactor
- M. javanicaMeloidogyne javanicae3pest
- Outcome
- infective second-stage juvenilese3
- Direction
- killede3
- Value
- 85.3%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica”
e1“a 90% concentration of aqueous extract derived from 1-month-old cavalcade leaves”
e3“killed infective second-stage juveniles of M. javanica (85.3%)”
Claim · model-written summary
Soil amendment with 1% (w/w) of 1-month-old Centrosema pascuorum leaves reduced Meloidogyne javanica in the glasshouse on okra.
- Taxon
- okra
.jpg?width=60)
Abelmoschus esculentuse5 - Treatment
- Soil amendments with 1% (w/w) of 1-month-old cavalcade leavese4
- Interactor
- M. javanicaMeloidogyne javanicae5pest
- Outcome
- control of M. javanicae5
- Direction
- decreaseinferrede5
- Setting
- glasshousee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica”
e4“Soil amendments with 1% (w/w) of 1-month-old cavalcade leaves”
e5“provided effective control of M. javanica in the glasshouse on okra”
Claim · model-written summary
One-month-old Centrosema pascuorum leaves were more effective than 2- or 3-month-old leaves.
- Taxon
- Centrosema pascuorumCentrosema pascuorumt0
- Treatment
- One-month-old leavese6
- Outcome
- effectivee6
- Direction
- more effectivee6
- Comparator
- 2- or 3-month-old leavese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica”
e6“One-month-old leaves appeared more effective than 2- or 3-month-old leaves”
Claim · model-written summary
Soil amendments had no phytotoxic effect on okra seed germination.
- Taxon
- okraAbelmoschus esculentuse7
- Outcome
- phytotoxic effect on okra seed germinatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The soil amendments had no adverse phytotoxic effect on okra seed germination”
Claim · model-written summary
Nematicidal activity of Centrosema pascuorum leaf compounds may be due to flavonoids, phenols and terpenoids.
- Taxon
- Centrosema pascuorumCentrosema pascuorumt0
- Compound
- flavonoids, phenols and terpenoidse7
- Outcome
- nematicidal activitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica”
e7“This may be due to the nematicidal activity of the various compounds in the leaves, such as flavonoids, phenols and terpenoids”
The same questions in other papers
other · Meloidogyne javanica · Abelmoschus esculentus (okra)Results agree
2 papers in the same direction as this paper
- positive
- 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.