Claim · model-written summary
In 1988 fungal infection in D. noxia appeared about six weeks after infestation.
- Taxon
- D. noxia
Diuraphis noxiae0 - Interactor
- Pandora neoaphidis
Pandora neoaphidise0pathogen - Outcome
- Fungal infection of aphidse0
- Value
- about 6 weekse0
- Qualifier
- in 1988 onlye0
Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungal infection of aphids, dominated by Pandora neoaphidis (Remaudière & Hennebert) Humber, was usually detected 2–3 weeks after detected infestation for M. dirhodum , 3–4 weeks for S. avenae and about 6 weeks for D. noxia (in 1988 only)”
Title
M. G. Feng; R. M. Nowierski; J. B. Johnson; et al. Journal of Applied Entomology 1992. doi:10.1111/j.1439-0418.1992.tb00678.x
Other claims from this paper (19)
- Observation Cereal aphids experienced entomophthoralean mycoses each summer from 1986 to 1989 in irrigated cereals.
- Observation S. avenae generally appeared one or two weeks earlier than M. dirhodum.
- Observation In 1988 S. avenae appeared four weeks later than D. noxia.
- Observation In 1988 M. dirhodum appeared five weeks later than D. noxia.
- Observation D. noxia first appeared on late-sown spring wheat in late June 1987 and heavily infested crops in 1988.
- Mechanism The unusually cold preceding winter prevented consistently detectable D. noxia populations in summer 1989.
- Observation M. dirhodum multiplied faster, developed larger populations and peaked earlier or concurrently with S. avenae.
- Observation Fungal infection in M. dirhodum was usually detected two to three weeks after infestation.
- Observation Fungal infection in S. avenae was usually detected three to four weeks after infestation.
- Association Initial P. neoaphidis inoculum was more closely associated with M. dirhodum than other aphids.
- Association Increasing fungal infection coincided with exponential aphid population growth.
- Observation Cadaver-to-live aphid ratios rose through 1:10 and 1:1 to approximately or above 10:1 over the season.
- Observation Annual aphid epizootics particularly on spring wheat usually occurred too late for complete crop protection.
- Association Earlier and stronger epizootics in 1987 suppressed aphids below economic injury at the milky crop stage and were apparently associated with heavier, more frequent June rain.
- Observation P. neoaphidis epizootics occurred more frequently in M. dirhodum than S. avenae populations.
- Observation S. avenae more often experienced Conidiobolus-caused enzootics.
- Association Cadaver density correlated well with preceding-week live aphid density, whereas regression often found aphid density negatively correlated with infection-level increase.
- Association In some cases epizootic development significantly correlated with one or two temporal or weather variables.
- Recommendation The authors recommend temporal and weather variables for predicting epizootic outcomes in some crop–aphid–pathogen systems.