Abstract
BACKGROUND: Tetranychus urticae Koch, the two-spotted spider mite, is a highly polyphagous and worldwide pest of many agricultural crops, including fruit, vegetables, and ornamentals. Typical methods of control include applications of acaricides and biological control agents. Here, we present a non-chemical technology for management of T. urticae on strawberry plants through the use of a nightly short-duration ultraviolet-C (UV-C) irradiation treatment. RESULTS: Potted strawberry plants infested with T. urticae that received a nightly 60-s exposure of UV-C irradiation had significantly fewer live mites per mid-canopy leaflet (fewer than five) than untreated control plants (> 175). Furthermore, none of the UV-C irradiated strawberry plants had any spider mite webbing; whereas, 65% of untreated plants were webbed. Tetranychus urticae feeding on untreated plants caused significant yellowing of the leaves compared with UV-C-treated plants. CONCLUSION: The UV-C irradiation treatment maintained mite populations below the accepted economic threshold of five mites per mid-canopy leaflet. No phytotoxic effects were visible on plants exposed to the short-duration nightly UV-C irradiation treatments. Further discussion is provided on the potential benefits of UV-C irradiation for mite management. Published 2018. This article is a U.S. Government work and is in the public domain in the USA.
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Claims 5
Claim · model-written summary
Nightly UV-C exposure reduced live mites per strawberry leaflet below five versus over 175 in controls.
- Taxon
- strawberry plants
_single2.jpg?width=60)
Fragaria ×ananassae0 - Treatment
- nightly 60-s exposure of UV-C irradiatione0
- Interactor
- T. urticae
.jpg?width=60)
Tetranychus urticaee0pest - Outcome
- live mites per mid-canopy leaflete0
- Direction
- fewere0
- Value
- fewer than fivee0
- Qualifier
- > 175e0
- Comparator
- untreated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
.jpg?width=500)
Verbatim
e0“Potted strawberry plants infested with T. urticae that received a nightly 60-s exposure of UV-C irradiation had significantly fewer live mites per mid-canopy leaflet (fewer than five) than untreated control plants (> 175).”
Claim · model-written summary
No irradiated strawberry plants had webbing versus 65% of untreated plants.
- Taxon
- strawberry plantsFragaria ×ananassae0
- Treatment
- UV-Ce0
- Interactor
- spider mitee0pest
- Outcome
- spider mite webbinge0
- Value
- 65%e0
- Comparator
- untreated plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the UV-C irradiated strawberry plants had any spider mite webbing; whereas, 65% of untreated plants were webbed.”
Claim · model-written summary
Untreated plants had significantly more mite-related leaf yellowing than UV-C treated plants.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- UV-C-treated plantse0
- Interactor
- Tetranychus urticaeTetranychus urticaee0pest
- Outcome
- yellowing of the leavese0
- Direction
- lowerinferrede0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetranychus urticae feeding on untreated plants caused significant yellowing of the leaves compared with UV-C-treated plants.”
e1“strawberry plants infested with T. urticae”
Claim · model-written summary
UV-C kept mite populations below the five-mite economic threshold.
- Taxon
- strawberriesFragaria ×ananassat0
- Treatment
- UV-C irradiation treatmente0
- Interactor
- mitee0pest
- Outcome
- mite populationse0
- Direction
- belowe0
- Value
- five mites per mid-canopy leaflete0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The UV-C irradiation treatment maintained mite populations below the accepted economic threshold of five mites per mid-canopy leaflet.”
t0“strawberries”
Claim · model-written summary
Nightly UV-C produced no visible phytotoxic effects.
- Taxon
- strawberriesFragaria ×ananassat0
- Treatment
- short-duration nightly UV-C irradiation treatmentse0
- Outcome
- phytotoxic effectse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No phytotoxic effects were visible on plants exposed to the short-duration nightly UV-C irradiation treatments.”
t0“strawberries”
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