Abstract
The pest control potentialities of neem seed kernel extract (NSKE) and neem cake extract (NCE) as rice seedling root-dip (SRD) against green leaf hopper (GLH), Nephotettix virescens (Dist.), during 1990 and 1991 summer seasons, were investigation under greenhouse conditions. The treatments indicated marked reduction in survival of the nymphs and adult emergence, prolongation in the duration of nymphal period and low growth indices. Among neem products, NCE 10% + 1% urea was most effective resulting in lowest adult emergence (13.34%) and growth index (0.76) followed by NSKE 5% + 1% urea which resulted in 20.0% adult emergence with 1.14 growth index as against 85% and 5.49 in untreated control, respectively. However, chlorpyriphos SRD treatment at 0.02% was superior to neem products against GLH, the corresponding figures being 5.0% and 0.28. The adverse effect of neem products on GLH was more pronounced at higher concentration than at lower concentration. At NSKE 2.5% + 1% urea and NCE 5% + 1% urea, the nymphs becoming adults and the growth indices were 43.33 and 28.34 per cent, and 2.55 and 1.62, respectively.
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Claims 7
Claim · model-written summary
Neem root dips reduced green leaf hopper nymph survival and adult emergence, prolonged nymphal development and lowered growth indices.
- Taxon
- rice
Oryza sativat0 - Treatment
- rice seedling root-dipt0
- Interactor
- green leaf hoppert0pest
- Outcome
- survival of the nymphs and adult emergencee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatments indicated marked reduction in survival of the nymphs and adult emergence, prolongation in the duration of nymphal period and low growth indices.”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
NCE 10% plus urea yielded 13.34% adult emergence.
- Taxon
- riceOryza sativat0
- Treatment
- NCE 10% + 1% ureae0
- Interactor
- green leaf hoppert0pest
- Outcome
- adult emergencee0
- Direction
- loweste0
- Value
- 13.34%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NCE 10% + 1% urea was most effective resulting in lowest adult emergence (13.34%)”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
NCE 10% plus urea yielded a growth index of 0.76.
- Taxon
- riceOryza sativat0
- Treatment
- NCE 10% + 1% ureae0
- Interactor
- green leaf hoppert0pest
- Outcome
- growth indexe0
- Direction
- loweste0
- Value
- 0.76e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NCE 10% + 1% urea was most effective resulting in lowest adult emergence (13.34%) and growth index (0.76)”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
NSKE 5% plus urea yielded 20.0% adult emergence.
- Taxon
- riceOryza sativat0
- Treatment
- NSKE 5% + 1% ureae0
- Interactor
- green leaf hoppert0pest
- Outcome
- adult emergencee0
- Value
- 20.0%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NSKE 5% + 1% urea which resulted in 20.0% adult emergence”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
NSKE 5% plus urea yielded a 1.14 growth index.
- Taxon
- riceOryza sativat0
- Treatment
- NSKE 5% + 1% ureae0
- Interactor
- green leaf hoppert0pest
- Outcome
- growth indexe0
- Value
- 1.14e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NSKE 5% + 1% urea which resulted in 20.0% adult emergence with 1.14 growth index”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
Chlorpyriphos root dip was superior to neem products against green leaf hopper.
- Taxon
- riceOryza sativat0
- Treatment
- chlorpyriphos SRD treatment at 0.02%e0
- Interactor
- green leaf hoppert0pest
- Outcome
- against GLHe0
- Direction
- superiore0
- Comparator
- neem productse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorpyriphos SRD treatment at 0.02% was superior to neem products against GLH”
t0“rice seedling root-dip against green leaf hopper”
Claim · model-written summary
Neem products affected green leaf hopper more strongly at higher concentration.
- Taxon
- riceOryza sativat0
- Treatment
- neem productse0
- Interactor
- green leaf hoppert0pest
- Outcome
- adverse effect of neem products on GLHe0
- Direction
- more pronouncede0
- Comparator
- lower concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The adverse effect of neem products on GLH was more pronounced at higher concentration than at lower concentration.”
t0“rice seedling root-dip against green leaf hopper”
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