Claim · model-written summary
Starting insecticide sprays eight weeks after emergence increased virus incidence versus starting at emergence.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- repeated insecticide sprays did not start until 8 weeks after crop emergence (WAE)e0
- Outcome
- virus incidencee0
- Direction
- greatere0
- Comparator
- regular applications started at emergencee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in treatments where repeated insecticide sprays did not start until 8 weeks after crop emergence (WAE), virus incidence and subsequent yield losses were significantly greater than when the regular applications started at emergence.”
t0“wheat”
Title
Deborah J. Thackray; Laura T. Ward; Monica L. Thomas-Carroll; et al. Australian Journal of Agricultural Research 2005. doi:10.1071/ar05048
Other claims from this paper (18)
- Observation BYDV-RMV and CYDV incidence was mostly low.
- Observation Rhopalosiphum padi predominated among aphid vectors.
- Intervention effect Insecticide sprays killed or repelled aphid vectors and stopped further virus spread.
- Observation Migrant aphids entered wheat throughout winter at both sites.
- Observation Peak colonising aphids ranged from 0 to 99 per transect.
- Observation BYDV-PAV incidence ranged from 0.1 to 58% of wheat plants.
- Observation Wheat yield ranged from 1.9 to 8.6 t/ha.
- Observation Aphids arrived earlier at Site A.
- Observation Virus spread and associated yield losses were greater at Site A.
- Intervention effect Starting sprays eight weeks after emergence increased yield losses versus starting at emergence.
- Intervention effect Delaying sprays beyond eight weeks had no additional effect on virus spread.
- Mechanism Early yield losses were attributed entirely to infection because aphids remained scarce until 8–10 weeks after emergence.
- Association BYDV-PAV incidence explained 81 or 91% of yield gap variation at Site A.
- Association Each one percent higher virus incidence corresponded to a 55 or 72 kg/ha yield decrease.
- Association Virus incidence explained 88% of seed weight variation.
- Association Virus incidence explained 69% of protein content variation.
- Association Virus incidence did not explain seed screenings.
- Observation Late virus spread at Site B caused no significant yield or quality losses.