Abstract
Surveys on percentages of infective planthopper have been continued since 1967 by the he-magglutination test, with parallel surveys on prevalence of planthopper by yellow pan water traps. The percentages at the first generation, immigrants into paddy fields, were rather high, exceeding 5% until 1969. In 1969, density of planthopper showed remarkable decrease due to unknown factors, which caused little occurrence of the rice stripe virus disease. Consequently, the percentage in the overwintering generation of 1969 to 1970 decreased clearly and it is still keeping a low level.It is important to follow whether or not the percentage shows any sign of increase due to change of agricultural economy, i.e., increase of fallow fields.
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Claims 4
Claim · model-written summary
Percentages of infective planthopper at the first generation, immigrating into paddy fields, exceeded 5% until 1969.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- first generatione1
- Interactor
- planthoppere2pest
- Second interactor
- rice stripe virusTenuivirus oryzaclavataet0pathogen
- Outcome
- percentages of infective planthoppere2
- Value
- exceeding 5%e1
- Setting
- paddy fieldse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The percentages at the first generation, immigrants into paddy fields, were rather high, exceeding 5% until 1969”
e2“Surveys on percentages of infective planthopper have been continued since 1967”
t0“Recent trend of percentage of infective planthopper, Laodelphax striatellus (Fallén), transmitting the rice stripe virus, in Kyushu”
Claim · model-written summary
Planthopper density showed a remarkable decrease in 1969 due to unknown factors, which caused little occurrence of rice stripe virus disease.
- Taxon
- riceOryza sativae3
- Interactor
- planthoppere3pest
- Second interactor
- rice stripe virusTenuivirus oryzaclavataee3pathogen
- Outcome
- density of planthoppere3
- Direction
- decreasee3
- Qualifier
- due to unknown factorse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“In 1969, density of planthopper showed remarkable decrease due to unknown factors, which caused little occurrence of the rice stripe virus disease”
Claim · model-written summary
The percentage of infective planthopper in the overwintering generation of 1969 to 1970 decreased clearly.
- Taxon
- riceOryza sativat0
- Organ / stage
- overwintering generatione4
- Interactor
- planthoppert0pest
- Second interactor
- rice stripe virusTenuivirus oryzaclavataet0pathogen
- Outcome
- percentage in the overwintering generatione4
- Direction
- decreasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Consequently, the percentage in the overwintering generation of 1969 to 1970 decreased clearly and it is still keeping a low level”
t0“Recent trend of percentage of infective planthopper, Laodelphax striatellus (Fallén), transmitting the rice stripe virus, in Kyushu”
Claim · model-written summary
The percentage of infective planthopper in the overwintering generation still remained at a low level.
- Taxon
- riceOryza sativat0
- Interactor
- planthoppert0pest
- Second interactor
- rice stripe virusTenuivirus oryzaclavataet0pathogen
- Outcome
- percentage in the overwintering generatione4
- Qualifier
- still keeping a low levele4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Consequently, the percentage in the overwintering generation of 1969 to 1970 decreased clearly and it is still keeping a low level”
t0“Recent trend of percentage of infective planthopper, Laodelphax striatellus (Fallén), transmitting the rice stripe virus, in Kyushu”