Abstract
An experiment to determine the effects of lemon grass, Andropogon citratus L. extract on the rootknot nematodes (Meloidogyne spp.) of okra was conducted. Phytochemical analyses of the bioactive ingredients in lemon grass were carried out to determine the chemical compounds with nematicidal activities present in lemon grass. Okra (var. Clemson 40) was planted in twenty four (24) experimental pots containing 5kg steam-sterilized loamy soil. Each plant stand was inoculated with 30ml of root-knot nematode egg suspension containing approximately150 eggs/ml. A set of 4 pots were left un-inoculated (control). The lemon grass extracts were 0, 25, 50, 75 and 100% concentrations. Two control trials were used: nematode uninoculated and untreated with leaf extract as control 1 and nematode inoculated but not treated as control 2. Each treatment was replicated four times. The experimental design was a completely randomized type. The result of the phytochemical screening showed that lemon grass contained tannins, alkaloids, flavonoids and saponins. The result of the pot trials showed that lemon grass extract significantly (P<0.05) increased growth and yield of nematode-infected okra. At 5-6 weeks after planting, plant height and number of leaves/plant were significantly (P<0.05) higher in the treated plants than the control. At harvest, the shoot weight of plants treated with higher levels of extract (75 and100%) were significantly (P<0.05) higher than the other treatments and the control . Mean fruit weight was significantly (P<0.05) higher in all the treated plants than in the inoculated but untreated control. Root gall index was significantly lower in treated than in the inoculated but untreated control. The higher concentrations of lemon grass extract were significantly more effective than the lower concentrations in controlling the nematodes and consequently improving the growth and yield of treated okra plants.
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Claims 7
Claim · model-written summary
Lemon grass contained tannins, alkaloids, flavonoids and saponins.
- Taxon
- lemon grass
Cymbopogon citratuse0 - Outcome
- tannins, alkaloids, flavonoids and saponinse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lemon grass contained tannins, alkaloids, flavonoids and saponins”
Claim · model-written summary
Lemon grass extract significantly increased growth and yield of nematode-infected okra.
- Taxon
- okra
.jpg?width=60)
Abelmoschus esculentuse0 - Treatment
- lemon grass extracte0
- Outcome
- growth and yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“lemon grass extract significantly (P<0.05) increased growth and yield of nematode-infected okra”
Claim · model-written summary
At five to six weeks, treated okra had significantly greater height and leaves per plant than controls.
- Treatment
- treated plantse0
- Outcome
- plant height and number of leaves/plante0
- Direction
- highere0
- Comparator
- the controle0
Not reportedTaxon
Verbatim
e0“At 5-6 weeks after planting, plant height and number of leaves/plant were significantly (P<0.05) higher in the treated plants than the control.”
Claim · model-written summary
At harvest, 75 and 100% extract treatments produced significantly higher shoot weight than other treatments and controls.
- Treatment
- higher levels of extract (75 and100%)e0
- Outcome
- shoot weighte0
- Direction
- highere0
- Comparator
- the other treatments and the controle0
Not reportedTaxon
Verbatim
e0“At harvest, the shoot weight of plants treated with higher levels of extract (75 and100%) were significantly (P<0.05) higher than the other treatments and the control”
Claim · model-written summary
All extract-treated okra had significantly greater mean fruit weight than inoculated untreated controls.
- Treatment
- all the treated plantse0
- Outcome
- Mean fruit weighte0
- Direction
- highere0
- Comparator
- inoculated but untreated controle0
Not reportedTaxon
Verbatim
e0“Mean fruit weight was significantly (P<0.05) higher in all the treated plants than in the inoculated but untreated control.”
Claim · model-written summary
Extract-treated okra had a significantly lower root gall index than inoculated untreated controls.
- Treatment
- treatede0
- Outcome
- Root gall indexe0
- Direction
- lowere0
- Comparator
- inoculated but untreated controle0
Not reportedTaxon
Verbatim
e0“Root gall index was significantly lower in treated than in the inoculated but untreated control.”
Claim · model-written summary
Higher lemon grass extract concentrations controlled nematodes more effectively than lower concentrations.
- Treatment
- higher concentrations of lemon grass extracte0
- Outcome
- controlling the nematodese0
- Direction
- more effectivee0
- Comparator
- lower concentrationse0
Not reportedTaxon
Verbatim
e0“The higher concentrations of lemon grass extract were significantly more effective than the lower concentrations in controlling the nematodes”
The same questions in other papers
botanical · Nematoda · Abelmoschus esculentus (okra)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.