Abstract
(Stål)(BPH) is a pest of rice in Asia. We examined the effects of seven insecticides combined with host resistance against BPH. In a screenhouse environment, we treated BPH-infested and non-infested resistant (IR62) and susceptible (IR64) rice with buprofezin, carbofuran, cartap hydrochloride, cypermethrin, deltamethrin, fipronil, or thiamethoxam + chlorantraniliprole. In one experiment, plants received one, two or three applications. In a second experiment, plants received one early or late insecticide application. Carbofuran and fipronil reduced planthopper biomass densities but resistance did not contribute to these effects (i.e., resistance was redundant). Single applications of cartap hydrochloride (at 20 or 50 days after sowing (DAS)), cypermethrin (20 DAS), or buprofezin (50 DAS) reduced BPH biomass densities on IR62 (i.e., synergies); other insecticides and application times, and multiple applications of all insecticides did not reduce BPH biomass densities on IR62 more than on IR64 (i.e., either resistance or insecticides were redundant). Deltamethrin (three applications) was antagonistic to resistance, but host resistance tended to buffer against the negative effects of single deltamethrin applications. Yields of infested IR62 were not statistically improved by insecticide applications. Late applications reduced yields of non-infested rice. We discuss how prophylactic insecticide applications could destabilize BPH populations and reduce the productivity and profitability of resistant rice.
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Claims 10
Claim · model-written summary
Carbofuran reduced planthopper biomass density without an added resistance effect.
- Taxon
- rice
Oryza sativat0 - Treatment
- Carbofurane0
- Interactor
- planthoppere0pest
- Outcome
- planthopper biomass densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbofuran and fipronil reduced planthopper biomass densities but resistance did not contribute to these effects”
t0“rice”
Claim · model-written summary
Fipronil reduced planthopper biomass density without an added resistance effect.
- Taxon
- riceOryza sativat0
- Treatment
- fipronile0
- Interactor
- planthoppere0pest
- Outcome
- planthopper biomass densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbofuran and fipronil reduced planthopper biomass densities but resistance did not contribute to these effects”
t0“rice”
Claim · model-written summary
A single cartap hydrochloride application reduced BPH biomass on resistant IR62 relative to susceptible IR64.
- Taxon
- riceOryza sativat0
- Material
- IR62e0
- Treatment
- cartap hydrochloride (at 20 or 50 days after sowing (DAS))e0
- Interactor
- BPHe0pest
- Outcome
- BPH biomass densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Single applications of cartap hydrochloride (at 20 or 50 days after sowing (DAS)), cypermethrin (20 DAS), or buprofezin (50 DAS) reduced BPH biomass densities on IR62”
t0“rice”
Claim · model-written summary
A single cypermethrin application reduced BPH biomass on IR62.
- Taxon
- riceOryza sativat0
- Material
- IR62e0
- Treatment
- cypermethrin (20 DAS)e0
- Interactor
- BPHe0pest
- Outcome
- BPH biomass densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cypermethrin (20 DAS), or buprofezin (50 DAS) reduced BPH biomass densities on IR62”
t0“rice”
Claim · model-written summary
A single buprofezin application reduced BPH biomass on IR62.
- Taxon
- riceOryza sativat0
- Material
- IR62e0
- Treatment
- buprofezin (50 DAS)e0
- Interactor
- BPHe0pest
- Outcome
- BPH biomass densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“buprofezin (50 DAS) reduced BPH biomass densities on IR62”
t0“rice”
Claim · model-written summary
Other insecticide timings and multiple applications did not reduce BPH biomass more on IR62 than IR64.
- Taxon
- riceOryza sativat0
- Material
- IR62e0
- Treatment
- multiple applications of all insecticidese0
- Interactor
- BPHe0pest
- Outcome
- BPH biomass densitiese0
- Direction
- did not reducee0
- Comparator
- IR64e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“other insecticides and application times, and multiple applications of all insecticides did not reduce BPH biomass densities on IR62 more than on IR64”
t0“rice”
Claim · model-written summary
Three deltamethrin applications antagonized resistance.
- Taxon
- riceOryza sativat0
- Treatment
- Deltamethrin (three applications)e0
- Outcome
- antagonistic to resistancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deltamethrin (three applications) was antagonistic to resistance”
t0“rice”
Claim · model-written summary
Resistance tended to buffer adverse effects of single deltamethrin applications.
- Taxon
- riceOryza sativat0
- Treatment
- single deltamethrin applicationse0
- Outcome
- negative effectse0
- Direction
- buffere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“host resistance tended to buffer against the negative effects of single deltamethrin applications”
t0“rice”
Claim · model-written summary
Insecticides did not significantly improve yields of infested IR62.
- Taxon
- riceOryza sativat0
- Material
- IR62e0
- Treatment
- insecticide applicationse0
- Outcome
- Yieldse0
- Direction
- not statistically improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of infested IR62 were not statistically improved by insecticide applications”
t0“rice”
Claim · model-written summary
Late insecticide applications reduced non-infested rice yields.
- Taxon
- riceOryza sativae0
- Treatment
- Late applicationse0
- Outcome
- yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Late applications reduced yields of non-infested rice”
The same questions in other papers
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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.