Abstract
We evaluated the efficacy of a mycophagous tydeid mite, Orthotydeus lambi, in controlling grape powdery mildew on mature vines of nine different grape cultivars and one unnamed hybrid grown in an experimental vineyard over a 3-year period. O. lambi became well established on all vines where they were released. However, some cultivars supported higher densities than others, depending on, among other factors, the presence and abundance of leaf trichomes in vein axils (domatia). The establishment of O. lambi substantially reduced powdery mildew on foliage and fruit, although the magnitude of disease suppression was greater on some grape genotypes than others, depending on mite density and innate susceptibility to grape powdery mildew. Treatments where O. lambi was used alone were as effective as fungicide. Significantly better disease control was found in treatments with both mites and fungicides. The mass of pruning material and leaf photosynthetic rates were significantly greater for vines with O. lambi, fungicide, or a combination of mites and fungicide compared with untreated vines. The combination of mites and fungicide resulted in significantly greater yield than mites or fungicide alone. Our results illustrate the potential of O. lambi for biological control of grape powdery mildew but also highlight limitations related to differences among grape genotypes in innate susceptibility to mildew and suitability for mites.
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Claims 9
Claim · model-written summary
Released O. lambi established on all vines.
Verbatim
t0“Grape”
e0“O. lambi became well established on all vines where they were released.”
Claim · model-written summary
Mite densities differed among cultivars and depended partly on leaf domatia.
Verbatim
t0“Grape”
e1“some cultivars supported higher densities than others, depending on, among other factors, the presence and abundance of leaf trichomes in vein axils (domatia).”
Claim · model-written summary
O. lambi establishment substantially reduced powdery mildew on foliage and fruit.
- Taxon
- Grapet0
- Treatment
- establishment of O. lambie2
- Interactor
- O. lambie2biocontrol_agent
- Outcome
- powdery mildew on foliage and fruite2
- Direction
- reducede2
Not reportedComparator
Verbatim
t0“Grape”
e2“The establishment of O. lambi substantially reduced powdery mildew on foliage and fruit, although the magnitude of disease suppression was greater on some grape genotypes than others, depending on mite density and innate susceptibility to grape powdery mildew.”
Claim · model-written summary
Disease suppression differed among grape genotypes with mite density and innate susceptibility.
Verbatim
t0“Grape”
e2“The establishment of O. lambi substantially reduced powdery mildew on foliage and fruit, although the magnitude of disease suppression was greater on some grape genotypes than others, depending on mite density and innate susceptibility to grape powdery mildew.”
Claim · model-written summary
Mites alone were as effective as fungicide.
Verbatim
t0“Grape”
e3“Treatments where O. lambi was used alone were as effective as fungicide. Significantly better disease control was found in treatments with both mites and fungicides.”
Claim · model-written summary
Mites plus fungicides gave significantly better disease control.
- Taxon
- Grapet0
- Treatment
- both mites and fungicidese3
- Interactor
- mitese3biocontrol_agent
- Outcome
- disease controle3
- Direction
- bettere3
Not reportedComparator
Verbatim
t0“Grape”
e3“Treatments where O. lambi was used alone were as effective as fungicide. Significantly better disease control was found in treatments with both mites and fungicides.”
Claim · model-written summary
Mites, fungicide, or both increased pruning mass relative to untreated vines.
Verbatim
t0“Grape”
e4“The mass of pruning material and leaf photosynthetic rates were significantly greater for vines with O. lambi, fungicide, or a combination of mites and fungicide compared with untreated vines.”
Claim · model-written summary
Mites, fungicide, or both increased leaf photosynthetic rate relative to untreated vines.
Verbatim
t0“Grape”
e4“The mass of pruning material and leaf photosynthetic rates were significantly greater for vines with O. lambi, fungicide, or a combination of mites and fungicide compared with untreated vines.”
Claim · model-written summary
Combined mites and fungicide increased yield relative to either alone.
Verbatim
t0“Grape”
e5“The combination of mites and fungicide resulted in significantly greater yield than mites or fungicide alone.”
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