Claim · model-written summary
Inoculation with chopped rotted roots also gave negative results.
- Treatment
- mixing chopped rotted roots of yellow-shoot-affected trees into thesoile0
- Outcome
- Negative resultse0
- Direction
- Negativee0
CitrusNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Negative results were also obtained from a field experimentin which 100 one-year old trees of Cheokan and 100 similar trees of Ponkan wereinoculated by mixing chopped rotted roots of yellow-shoot-affected trees into thesoil”
t0“CITRUS”
Title
ETIOLOGICAL STUDIES OF YELLOW SHOOT OF CITRUS
Lin Kang Acta Phytopathologica Sinica 1956
Other claims from this paper (19)
- Observation Yellow shoot occurred across lowland and highland Citrus sites.
- Association The study found no direct relationship between water injury and yellow shoot development.
- Observation Experimental Citrus roots were generally well above the soil water table.
- Intervention effect At the shallowest water table, the first group of nursery trees developed serious water injury with symptoms distinct from yellow shoot.
- Intervention effect Trees injured by high water table gradually recovered after the water table was lowered.
- Observation Microscopy found 34 nematodes on 8 rotted rootlets from 5 affected Citrus trees.
- Observation The remaining examined rootlets of diseased trees were free from nematodes.
- Mechanism The authors concluded that nematodes do not cause yellow shoot.
- Intervention effect Soil inoculation with Fusarium pure cultures caused no infection symptoms after two years.
- Intervention effect Direct rootlet contact with Fusarium cultures affected 2 of 14 trees, but symptoms differed from yellow shoot.
- Intervention effect Fusarium root-wound inoculation rotted most roots within 14–30 days, whereas checks stayed healthy.
- Intervention effect The more virulent Fusarium strain totally rotted inoculated roots.
- Association Root rot severity rose with Fusarium virulence.
- Association Root rot severity fell as root starch content increased.
- Observation Only the most virulent Fusarium strain rotted high-starch roots of healthy trees.
- Mechanism The authors concluded Fusarium was not the primary cause of yellow shoot but could invade weakened roots.
- Intervention effect Bud inoculation transmitted yellow shoot to Cheokan and Ponkan at higher frequencies than checks.
- Mechanism The authors concluded that a virus is the primary causal agent of yellow shoot and that nursery trees carry and naturally transmit it.
- Recommendation The authors recommend strict quarantine to prevent further yellow shoot spread.