Abstract
The locational preference of the brown planthopper (BPH) Nilaparvata lugens () and the whitebacked plant hopper (WBPH) Sogatella furcifera(Horvath) was studied on rice cultivars IR22 and IR36 as an integral part of subsequent research on insect-fungal pathogen relationships. The BPH was observed to stay consistently on the basal portion while the WBPH showed a general preference for the upper portion regardless of varieties, rice growth stages and insect population density levels. The habitat preference of both species (BPH and WBPH) was found not to be affected by the presence of the other species when both species are present on the same host plant Five rice cultivars with different reactions to BPH biotype 2 were used in the study on BPH-Rhizoctonia solani relationship: IR22 and TN1 (susceptible); Triveni and ASD7 (moderately resistant); and IR42 (resistant). Test plants were inoculated with R. solani (Kuhn) days after insect infestation. Sheath blight disease severity/incidence was significantly higher in the treatment where BPH+R. solani were together than in the treatment with only the pathogen. Symptom expression of the disease in the BPH-pathogen combination was faster and mycelial growth was more profuse inducing the formation of more infection structures. Regardless of varietal reaction to BPH biotype 2, the degree of hopperburn was significantly higher in the combination of the two pests as compared with that of BPH alone. There could be a synergistic relationship between the insect pest and the pathogen indicated by a positive interaction between the two species.
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Claims 8
Claim · model-written summary
Brown planthopper stayed consistently on the basal portion of rice plants.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- basal portione1
- Interactor
- BPHe1pest
- Outcome
- stay consistently on the basal portione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“The BPH was observed to stay consistently on the basal portion”
Claim · model-written summary
Whitebacked planthopper generally preferred the upper portion of rice plants regardless of variety, growth stage and population density.
- Taxon
- RiceOryza sativat0
- Organ / stage
- upper portione1
- Interactor
- WBPHe1pest
- Outcome
- general preference for the upper portione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“the WBPH showed a general preference for the upper portion regardless of varieties, rice growth stages and insect population density levels”
Claim · model-written summary
The habitat preference of BPH and WBPH was not affected by the presence of the other species on the same host plant.
- Taxon
- RiceOryza sativat0
- Interactor
- BPHe1pest
- Second interactor
- WBPHe1pest
- Outcome
- habitat preferencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“The habitat preference of both species (BPH and WBPH) was found not to be affected by the presence of the other species”
Claim · model-written summary
Sheath blight severity/incidence was significantly higher with BPH and R. solani together than with the pathogen alone.
- Taxon
- RiceOryza sativat0
- Treatment
- BPH+R. solanie1
- Interactor
- R. solani
Rhizoctonia solanie1pathogen - Second interactor
- BPHe1pest
- Outcome
- Sheath blight disease severity/incidencee1
- Direction
- highere1
- Comparator
- only the pathogene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“Sheath blight disease severity/incidence was significantly higher in the treatment where BPH+R. solani were together than in the treatment with only the pathogen”
Claim · model-written summary
Disease symptom expression was faster in the BPH-pathogen combination.
- Taxon
- RiceOryza sativat0
- Treatment
- BPH-pathogen combinatione1
- Interactor
- pathogene1pathogen
- Second interactor
- BPHe1pest
- Outcome
- Symptom expression of the diseasee1
- Direction
- fastere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“Symptom expression of the disease in the BPH-pathogen combination was faster”
Claim · model-written summary
Mycelial growth of the pathogen was more profuse in the BPH-pathogen combination.
- Taxon
- RiceOryza sativat0
- Treatment
- BPH-pathogen combinatione1
- Interactor
- pathogene1pathogen
- Second interactor
- BPHe1pest
- Outcome
- mycelial growthe1
- Direction
- more profusee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“Symptom expression of the disease in the BPH-pathogen combination was faster and mycelial growth was more profuse inducing the formation of more infection structures”
Claim · model-written summary
Hopperburn was significantly higher with BPH and the pathogen combined than with BPH alone, regardless of varietal reaction to BPH biotype 2.
- Taxon
- RiceOryza sativat0
- Treatment
- combination of the two pestse1
- Interactor
- BPHe1pest
- Outcome
- degree of hopperburne1
- Direction
- highere1
- Qualifier
- Regardless of varietal reaction to BPH biotype 2e1
- Comparator
- BPH alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“Regardless of varietal reaction to BPH biotype 2, the degree of hopperburn was significantly higher in the combination of the two pests as compared with that of BPH alone”
Claim · model-written summary
The authors suggest a synergistic relationship between the insect pest and the pathogen, indicated by a positive interaction.
- Taxon
- RiceOryza sativat0
- Outcome
- synergistic relationship between the insect pest and the pathogene1
- Qualifier
- positive interaction between the two speciese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“There could be a synergistic relationship between the insect pest and the pathogen indicated by a positive interaction between the two species”
The same questions in other papers
Nilaparvata lugens · disease · Oryza sativa (rice)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
Rhizoctonia solani · disease · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.