Abstract
Abstract BACKGROUND Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses. In order to develop alternatives of chemical insecticides for thrips control, based on fumigant activity screening and evaluation of 22 essential oil (EO) compounds against the thrips, the binary interactions of methyl salicylate and carvacrol (MS‐C) with high fumigant toxicity were studied systematically by bioassay and field trials. RESULTS The bioassay results showed that six in 22 EO compounds had high fumigant toxicity against both the second‐instar nymphs and adults of A. obscurus , including methyl salicylate, carvacrol, thymol, trans ‐cinnamaldehyde, diallyl trisulfide, and L‐perillaldehyde. Furthermore, the combination of methyl salicylate mixed with carvacrol at a volume ratio of 5:5 exhibited the most significant synergism against A. obscurus , with a poison ratio value of 1.32 and a co‐toxicity coefficient of 151.15. The optimal formulation of microemulsion (ME) was composed of 5% methyl salicylate, 5% carvacrol, 46% adjuvant and 44% deionized water. The result of dynamic light scattering and stability showed that MS‐C 10% ME was a transparent, single‐phase and homogeneous liquid system. Field trials indicated that the ME displayed a significant control efficacy of about 89.17% on thrips in peppers, and 82.59% in broad bean on the seventh day post application with a dosage of 600.0 g A.I hm –2 , respectively. CONCLUSION The binary combination of MS‐C possesses strikingly synergistic action against thrips A. obscurus , and the MS‐C 10% ME has the potential to be developed as a botanical pesticide product for thrips control. © 2019 Society of Chemical Industry
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Claims 6
Claim · model-written summary
Six of 22 essential oil compounds had high fumigant toxicity against Anaphothrips obscurus.
- Taxon
- cereals and other grassese0
- Interactor
- Anaphothrips obscurusAnaphothrips obscuruse0pest
- Outcome
- fumigant toxicitye1
- Qualifier
- six in 22 EO compoundse1
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e1“The bioassay results showed that six in 22 EO compounds had high fumigant toxicity”
Claim · model-written summary
The methyl salicylate and carvacrol mixture at a 5:5 volume ratio showed the most significant synergism against A. obscurus.
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e2“the combination of methyl salicylate mixed with carvacrol at a volume ratio of 5:5 exhibited the most significant synergism against A. obscurus”
e3“with a poison ratio value of 1.32”
Claim · model-written summary
The mixture had a co-toxicity coefficient of 151.15 against A. obscurus.
- Taxon
- cereals and other grassese0
- Interactor
- Anaphothrips obscurusAnaphothrips obscuruse0pest
- Outcome
- co‐toxicity coefficiente4
- Value
- 151.15e4
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e4“and a co‐toxicity coefficient of 151.15”
Claim · model-written summary
The microemulsion gave a control efficacy of about 89.17% on thrips in peppers at 7 days after application.
Capsicum
ThripsNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e5“Field trials indicated that the ME displayed a significant control efficacy of about 89.17% on thrips in peppers”
Claim · model-written summary
The microemulsion gave a control efficacy of 82.59% on thrips in broad bean at 7 days after application.
- Taxon
- broad bean
Vicia fabae6 - Treatment
- MEe5
- Outcome
- control efficacye5
- Direction
- increaseinferrede5
- Value
- 82.59%e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e5“Field trials indicated that the ME displayed a significant control efficacy of about 89.17% on thrips in peppers”
e6“and 82.59% in broad bean on the seventh day post application”
Claim · model-written summary
The microemulsion can be developed as a botanical pesticide product for thrips control.
Verbatim
e0“Thrips Anaphothrips obscurus are one of the cosmopolitan major pests feeding on cereals and other grasses”
e7“has the potential to be developed as a botanical pesticide product for thrips control”