Abstract
BACKGROUND: Tetranychus urticae is a hard-to-control pest of greenhouse strawberry production. Nighttime ultraviolet B (UV-B) radiation using light reflection sheets (LRS) has been applied as a physical method to control T. urticae through direct ovicidal effects (the UV method). However, because strawberry leaves grow more densely, UV-B radiation fails to reach the lower leaf surfaces inhabited by spider mites; therefore, a complementary method is required. We propose the supplemental application of phytoseiid mites in greenhouse strawberry production. We evaluated the control effects of UV-B irradiation, phytoseiid mite application and their combined use. The effects of UV-B irradiation on the degree of overlap relative to the independent distributions (ω) between predators and prey were also analyzed. RESULTS: The UV method alone maintained low T. urticae density levels from November to February; however, mite populations increased from March onward. Phytoseiid mite application in January and February without UV-B irradiation resulted in a temporary increase in spider mites in March and/or April. By contrast, combined application of the UV method and phytoseiid mites had a greater control effect during the strawberry growing season. The ω values were higher for the UV method compared with no UV-B irradiation, suggesting that UV-B irradiation increased phytoseiid mite foraging rates. CONCLUSION: The release of phytoseiid mites compensated for the shortcomings of the UV method, and UV-B irradiation promoted predation by phytoseiid mites by increasing the behavioral numerical response. Consequently, combined application of UV-B irradiation and phytoseiid mites is optimal for T. urticae control in greenhouse strawberry production. © 2023 Society of Chemical Industry.
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Claims 8
Claim · model-written summary
The ultraviolet method held spider mite density low from November to February.
- Treatment
- The UV method alonee0
- Interactor
- T. urticae
.jpg?width=60)
Tetranychus urticaee0pest - Outcome
- T. urticae density levelse0
- Direction
- lowe0
- Qualifier
- from November to Februarye0
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The UV method alone maintained low T. urticae density levels from November to February”
Claim · model-written summary
Spider mite populations increased from March under ultraviolet treatment.
Not reportedTaxon
Verbatim
e0“mite populations increased from March onward”
Claim · model-written summary
Phytoseiid application alone led to a temporary spider mite increase in March or April.
- Treatment
- Phytoseiid mite application in January and February without UV-B irradiatione0
- Outcome
- spider mitese0
- Direction
- increasee0
- Qualifier
- in March and/or Aprile0
Not reportedTaxonComparator
Verbatim
e0“Phytoseiid mite application in January and February without UV-B irradiation resulted in a temporary increase in spider mites in March and/or April”
Claim · model-written summary
Combined ultraviolet and phytoseiid application gave greater control during strawberry growth.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassae0 - Treatment
- combined application of the UV method and phytoseiid mitese0
- Outcome
- control effecte0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“combined application of the UV method and phytoseiid mites had a greater control effect during the strawberry growing season”
Claim · model-written summary
Ultraviolet treatment raised predator–prey overlap values relative to no irradiation.
Not reportedTaxon
Verbatim
e0“The ω values were higher for the UV method compared with no UV-B irradiation”
Claim · model-written summary
The authors infer that ultraviolet irradiation increased phytoseiid foraging rates.
Not reportedTaxon
Verbatim
e0“suggesting that UV-B irradiation increased phytoseiid mite foraging rates”
Claim · model-written summary
The authors infer ultraviolet irradiation promoted predation through a behavioral numerical response.
- Treatment
- UV-B irradiatione0
- Outcome
- predation by phytoseiid mitese0
- Qualifier
- increasing the behavioral numerical responsee0
Not reportedTaxon
Verbatim
e0“UV-B irradiation promoted predation by phytoseiid mites by increasing the behavioral numerical response”
Claim · model-written summary
The authors recommend combined ultraviolet and phytoseiid application for spider mite control.
- Taxon
- strawberryFragaria ×ananassae0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- combined application of UV-B irradiation and phytoseiid mitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combined application of UV-B irradiation and phytoseiid mites is optimal for T. urticae control in greenhouse strawberry production”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.