Abstract
Entomopathogenic nematodes (EPNs) of families Heterorhabditidae and Steinernematidae are known to be effective against a variety of pests. In the present work, different EPNs that are isolated from the Egyptian environment were tested against the onion thrips, Thrips tabaci Lindeman (Thysanoptera: Thripidae), under field conditions. The Egyptian EPNs were tested at different concentrations and against different onion thrips stages (adult and nymph). When used as a foliage spray, the tested EPN isolates were efficient against both adult and nymph stages. Differences in pathogenicity were observed within the same EPN species as in Heterorhabditis indica (EGAZ3) that caused higher reduction in population of T. tabaci (adult and nymph) after 24 and 48 h at a concentration of 10,000 infective juveniles (IJs)/ml compared to H. indica (EGAZ2) after 24 h post treatment at a concentration of 15,000 IJs/ml. The same pattern was observed with Heterorhabditis bacteriophora (HP88), where a higher reduction percent was recorded after 24 h at a concentration of 20,000 IJs/ml. On the other hand, Steinernema carpocapsae (All), S. carpocapsae (EGAZ9), and S. carpocapsae (BA2) isolates were less effective in controlling onion thrips (adult and nymph) population. In general, controlling T. tabaci at the nymphal stage was more efficient than at the adult stage (12-73% reduction at the nymph stage compared to 6-65% at the adult stage). It was also found that increasing inoculation concentration above 15,000 IJs/ml had no significant difference in controlling onion thrips populations.
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Claims 10
Claim · model-written summary
Foliar application of the tested nematode isolates controlled adult onion thrips.
- Taxon
- onion
Allium cepat0 - Treatment
- foliage spraye0
- Interactor
- Thrips tabaci
Thrips tabacit0pest - Second interactor
- EPN isolatese0biocontrol_agent
- Outcome
- adulte0
- Direction
- efficiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When used as a foliage spray, the tested EPN isolates were efficient against both adult and nymph stages.”
t0“onion thrips, Thrips tabaci”
Claim · model-written summary
Foliar application of the tested nematode isolates controlled nymph onion thrips.
- Taxon
- onionAllium cepat0
- Treatment
- foliage spraye0
- Interactor
- Thrips tabaciThrips tabacit0pest
- Second interactor
- EPN isolatese0biocontrol_agent
- Outcome
- nymphe0
- Direction
- efficiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When used as a foliage spray, the tested EPN isolates were efficient against both adult and nymph stages.”
t0“onion thrips, Thrips tabaci”
Claim · model-written summary
H. indica EGAZ3 reduced adult and nymph T. tabaci populations more than EGAZ2 under the stated conditions.
- Taxon
- onionAllium cepat0
- Treatment
- Heterorhabditis indica (EGAZ3)e0
- Interactor
- T. tabaciThrips tabacie0pest
- Second interactor
- Heterorhabditis indica (EGAZ3)Heterorhabditis indicae0biocontrol_agent
- Outcome
- population of T. tabaci (adult and nymph)e0
- Direction
- higher reductione0
- Qualifier
- after 24 and 48 h at a concentration of 10,000 infective juveniles (IJs)/mle0
- Comparator
- H. indica (EGAZ2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heterorhabditis indica (EGAZ3) that caused higher reduction in population of T. tabaci (adult and nymph) after 24 and 48 h at a concentration of 10,000 infective juveniles (IJs)/ml compared to H. indica (EGAZ2) after 24 h post treatment at a concentration of 15,000 IJs/ml.”
t0“onion”
Claim · model-written summary
H. bacteriophora HP88 gave higher onion thrips reduction after 24 hours at 20,000 IJs/ml.
- Taxon
- onionAllium cepat0
- Treatment
- Heterorhabditis bacteriophora (HP88)e0
- Interactor
- Thrips tabaciThrips tabacit0pest
- Second interactor
- Heterorhabditis bacteriophora (HP88)
_Poinar%2C_1975.jpg?width=60)
Heterorhabditis bacteriophorae0biocontrol_agent - Outcome
- reduction percente0
- Direction
- highere0
- Qualifier
- after 24 h at a concentration of 20,000 IJs/mle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poinar%2C_1975.jpg?width=500)
Verbatim
e0“Heterorhabditis bacteriophora (HP88), where a higher reduction percent was recorded after 24 h at a concentration of 20,000 IJs/ml.”
t0“onion thrips, Thrips tabaci”
Claim · model-written summary
Steinernema carpocapsae (All) was less effective against onion thrips.
- Taxon
- onionAllium cepat0
- Treatment
- Steinernema carpocapsae (All)e0
- Interactor
- onion thripse0pest
- Second interactor
- Steinernema carpocapsae (All)
Steinernema carpocapsaee0biocontrol_agent
- Outcome
- onion thrips (adult and nymph) populatione0
- Direction
- less effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Steinernema carpocapsae (All), S. carpocapsae (EGAZ9), and S. carpocapsae (BA2) isolates were less effective in controlling onion thrips (adult and nymph) population.”
t0“onion”
Claim · model-written summary
S. carpocapsae (EGAZ9) was less effective against onion thrips.
- Taxon
- onionAllium cepat0
- Treatment
- S. carpocapsae (EGAZ9)e0
- Interactor
- onion thripse0pest
- Second interactor
- S. carpocapsae (EGAZ9)
- Outcome
- onion thrips (adult and nymph) populatione0
- Direction
- less effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Steinernema carpocapsae (All), S. carpocapsae (EGAZ9), and S. carpocapsae (BA2) isolates were less effective in controlling onion thrips (adult and nymph) population.”
t0“onion”
Claim · model-written summary
S. carpocapsae (BA2) was less effective against onion thrips.
- Taxon
- onionAllium cepat0
- Treatment
- S. carpocapsae (BA2)e0
- Interactor
- onion thripse0pest
- Second interactor
- S. carpocapsae (BA2)
- Outcome
- onion thrips (adult and nymph) populatione0
- Direction
- less effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Steinernema carpocapsae (All), S. carpocapsae (EGAZ9), and S. carpocapsae (BA2) isolates were less effective in controlling onion thrips (adult and nymph) population.”
t0“onion”
Claim · model-written summary
Nymph T. tabaci control was more efficient, with 12-73% reduction.
- Taxon
- onionAllium cepat0
- Treatment
- nymphal stagee0
- Interactor
- T. tabaciThrips tabacie0pest
- Outcome
- controlling T. tabacie0
- Direction
- more efficiente0
- Value
- 12-73%e0
- Comparator
- adult stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“controlling T. tabaci at the nymphal stage was more efficient than at the adult stage (12-73% reduction at the nymph stage compared to 6-65% at the adult stage).”
t0“onion”
Claim · model-written summary
Adult T. tabaci control gave 6-65% reduction.
- Taxon
- onionAllium cepat0
- Organ / stage
- adult stagee0
- Interactor
- Thrips tabaciThrips tabacit0pest
- Outcome
- reductione0
- Value
- 6-65%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-73% reduction at the nymph stage compared to 6-65% at the adult stage”
t0“onion thrips, Thrips tabaci”
Claim · model-written summary
Increasing nematode inoculation above 15,000 IJs/ml made no significant difference in onion thrips control.
- Taxon
- onionAllium cepat0
- Treatment
- increasing inoculation concentration above 15,000 IJs/mle0
- Interactor
- onion thripse0pest
- Outcome
- controlling onion thrips populationse0
- Direction
- no significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing inoculation concentration above 15,000 IJs/ml had no significant difference in controlling onion thrips populations.”
t0“onion”
The same questions in other papers
inoculation · pest · Allium cepa (onion)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →application · Thrips tabaci · Allium cepa (onion)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.