Abstract
Four aqueous plant extracts (APEs) of Acorus calamus (L), Xanthium strumarium (L), Polygonum hydropiper (L) and Clerodendron infortunatum (Gaertn) were evaluated under both laboratory and field conditions at 2.5, 5.0 and 10.0% (w/v) concentrations against tea red spider mite, Oligonychus coffeae (Nietner). Also, the impact of APEs on survival and feeding of Stethorus gilvifrons, a potent coccinellid predator of red spider mite was studied. Parameters assessed were ovicidal activity and acaricidal activity in case of red spider mite, and feeding activity and adult mortality for the coccinellid. Strong ovicidal action was observed with X. strumarium (87.09%) and A. calamus (70.62%) whereas least action in P. hydropiper (30.86%) and C. infortunatum (20.58%). All the APEs showed > 50% mortality of red spider mite at higher concentrations (5 and 10%) under laboratory conditions. Field evaluation of APEs recorded 46.9 – 81.8% mite reduction at 5.0% and 64.7 – 100.0% at 10.0% concentration. More acaricidal activity was noticed in C. infortunatum and X. strumarium under field condition. The APEs, even at higher concentration (10%), caused no mortality to the adults of S. gilvifrons for 14 days, and no significant change in feeding after 24 h in comparison with untreated control. Crude plant extracts of A. calamus, X. strumarium, P. hydropiper and C. infortunatum can effectively be utilized as safer phytopesticidal products in both organic and inorganic tea estates as one of the potent tools in integrated mite management.
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Claims 12
Claim · model-written summary
X. strumarium extract had 87.09% ovicidal action against tea red spider mite.
- Taxon
- teat0
- Treatment
- X. strumariume0
- Interactor
- Oligonychus coffeaeOligonychus coffeaee1pest
- Outcome
- ovicidal actione0
- Direction
- Stronge0
- Value
- 87.09%e0
Not reportedComparator
Verbatim
t0“tea”
e0“Strong ovicidal action was observed with X. strumarium (87.09%)”
e1“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
A. calamus extract had 70.62% ovicidal action against tea red spider mite.
- Taxon
- teat0
- Treatment
- A. calamuse0
- Interactor
- Oligonychus coffeaeOligonychus coffeaee1pest
- Outcome
- ovicidal actione0
- Direction
- Stronge0
- Value
- 70.62%e0
Not reportedComparator
Verbatim
t0“tea”
e0“Strong ovicidal action was observed with X. strumarium (87.09%) and A. calamus (70.62%)”
e1“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
P. hydropiper extract had 30.86% ovicidal action.
- Taxon
- teat0
- Treatment
- P. hydropipere0
- Interactor
- Oligonychus coffeaeOligonychus coffeaee2pest
- Outcome
- ovicidal actione1
- Direction
- leaste0
- Value
- 30.86%e0
Not reportedComparator
Verbatim
t0“tea”
e0“least action in P. hydropiper (30.86%) and C. infortunatum (20.58%)”
e1“ovicidal action”
e2“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
C. infortunatum extract had 20.58% ovicidal action.
- Taxon
- teat0
- Treatment
- C. infortunatume0
- Interactor
- Oligonychus coffeaeOligonychus coffeaee2pest
- Outcome
- ovicidal actione1
- Direction
- leaste0
- Value
- 20.58%e0
Not reportedComparator
Verbatim
t0“tea”
e0“least action in P. hydropiper (30.86%) and C. infortunatum (20.58%)”
e1“ovicidal action”
e2“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
All extracts caused over 50% mite mortality at 5 and 10% in the laboratory.
- Taxon
- teat0
- Treatment
- APEse0
- Interactor
- red spider mitee0pest
- Outcome
- mortality of red spider mitee0
- Value
- > 50%e0
- Setting
- laboratory conditionse0
Not reportedComparatorDirection
Verbatim
t0“tea”
e0“All the APEs showed > 50% mortality of red spider mite at higher concentrations (5 and 10%) under laboratory conditions”
Claim · model-written summary
Field extracts at 5.0% reduced mites by 46.9 – 81.8%.
- Taxon
- teat0
- Treatment
- APEse0
- Interactor
- mitee0pest
- Outcome
- mite reductione0
- Direction
- reductione0
- Value
- 46.9 – 81.8%e0
- Setting
- Fielde0
Not reportedComparator
Verbatim
t0“tea”
e0“Field evaluation of APEs recorded 46.9 – 81.8% mite reduction at 5.0%”
Claim · model-written summary
Field extracts at 10.0% reduced mites by 64.7 – 100.0%.
- Taxon
- teat0
- Treatment
- APEse0
- Interactor
- mitee0pest
- Outcome
- mite reductione0
- Direction
- reductione0
- Value
- 64.7 – 100.0%e0
- Setting
- Fielde0
Not reportedComparator
Verbatim
t0“tea”
e0“Field evaluation of APEs recorded 46.9 – 81.8% mite reduction at 5.0% and 64.7 – 100.0% at 10.0% concentration”
Claim · model-written summary
C. infortunatum showed more field acaricidal activity.
Verbatim
t0“tea”
e0“More acaricidal activity was noticed in C. infortunatum and X. strumarium under field condition”
e1“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
X. strumarium showed more field acaricidal activity.
Verbatim
t0“tea”
e0“More acaricidal activity was noticed in C. infortunatum and X. strumarium under field condition”
e1“tea red spider mite, Oligonychus coffeae (Nietner)”
Claim · model-written summary
Extracts at 10% caused no adult Stethorus mortality over 14 days.
- Taxon
- teat0
- Treatment
- APEse0
- Interactor
- S. gilvifronse0biocontrol_agent
- Outcome
- mortality to the adults of S. gilvifronse0
- Direction
- no mortalitye0
Not reportedComparator
Verbatim
t0“tea”
e0“The APEs, even at higher concentration (10%), caused no mortality to the adults of S. gilvifrons for 14 days”
Claim · model-written summary
Extracts caused no significant change in Stethorus feeding after 24 h versus untreated control.
Verbatim
t0“tea”
e0“The APEs, even at higher concentration (10%), caused no mortality to the adults of S. gilvifrons for 14 days, and no significant change in feeding after 24 h in comparison with untreated control”
Claim · model-written summary
The authors recommend these extracts as safer mite-management products for tea estates.
Verbatim
t0“tea”
e0“Crude plant extracts of A. calamus, X. strumarium, P. hydropiper and C. infortunatum can effectively be utilized as safer phytopesticidal products in both organic and inorganic tea estates as one of the potent tools in integrated mite management”
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