Abstract
Twospotted spider mite, Tetranychus urticae Koch, is a significant pest of peanut, Arachis hypogeae L., that continues to present problems as an induced pest despite recent widespread implementation of IPM practices. Effects of ozone (O 3 ) on reproduction of twospotted spider mites feeding on an O 3 -sensitive clone and an O 3 -resistant clone of white clover, Trifolium repens L., were investigated in a greenhouse in continuous-stirred tank reactor chambers. Mite eggs of narrow age distribution (≍6 h) were placed on white clover plants exposed to 5 treatment levels of O 3 . Constant amounts of O 3 were added to charcoal-filtered air for 6 h per day to achieve 5 mean concentrations ranging from 10 to 112 nl per liter. Plants were exposed to O 3 ≍9 d before infestation with mites; daily exposures continued for ≍20 d after mite infestation. The developmental stage of each mite was recorded at ≍2-d intervals until females were sexually mature (≍10 d) and began ovipositing. Thereafter, the cumulative number of eggs produced per mite was recorded. After ≍5 d of oviposition, each adult mite was removed and the percentage hatch of eggs remaining on each plant was measured for an additional 5 d. Ozone caused more chlorosis and necrosis on the O 3 -sensitive clover clone than on the O 3 -resistant clover clone. Increasing O 3 levels caused a significant linear decrease in developmental period of the mites. Estimates of time to 1st oviposition decreased linearly with increasing O 3 . Estimates of time of 1st hatch of 2nd-generation eggs decreased linearly with increasing O 3 . Elevated O 3 levels appear to decrease the time required for female mites to develop from egg to ovipositing adult, which may have a profound effect on the intrinsic rate of population increase. Different responses by mites feeding on resistant plants versus susceptible plants suggests that this is a plant-mediated response.
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Claims 5
Claim · model-written summary
Ozone caused more chlorosis and necrosis on the sensitive clover clone than the resistant clone.
- Taxon
- White Clover
Trifolium repenst0 - Material
- O 3 -sensitive clover clonee0
- Treatment
- Ozonee0
- Outcome
- chlorosis and necrosise0
- Direction
- moree0
- Comparator
- O 3 -resistant clover clonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ozone caused more chlorosis and necrosis on the O 3 -sensitive clover clone than on the O 3 -resistant clover clone.”
t0“White Clover”
Claim · model-written summary
Increasing ozone significantly shortened mite developmental period.
- Taxon
- White CloverTrifolium repenst0
- Treatment
- Increasing O 3 levelse0
- Interactor
- Twospotted Spider Mitet1pest
- Outcome
- developmental period of the mitese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing O 3 levels caused a significant linear decrease in developmental period of the mites.”
t0“White Clover”
t1“Twospotted Spider Mite”
Claim · model-written summary
Time to first mite oviposition decreased linearly as ozone rose.
- Taxon
- White CloverTrifolium repenst0
- Treatment
- increasing O 3e0
- Interactor
- Twospotted Spider Mitet1pest
- Outcome
- time to 1st ovipositione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Estimates of time to 1st oviposition decreased linearly with increasing O 3 .”
t0“White Clover”
t1“Twospotted Spider Mite”
Claim · model-written summary
Time to first hatch of second-generation mite eggs decreased linearly as ozone rose.
- Taxon
- White CloverTrifolium repenst0
- Treatment
- increasing O 3e0
- Interactor
- Twospotted Spider Mitet1pest
- Outcome
- time of 1st hatch of 2nd-generation eggse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Estimates of time of 1st hatch of 2nd-generation eggs decreased linearly with increasing O 3 .”
t0“White Clover”
t1“Twospotted Spider Mite”
Claim · model-written summary
Mite responses differed between resistant and susceptible clover plants.
- Taxon
- White CloverTrifolium repenst0
- Interactor
- Twospotted Spider Mitet1pest
- Outcome
- Different responses by mitese0
- Comparator
- resistant plants versus susceptible plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Different responses by mites feeding on resistant plants versus susceptible plants suggests that this is a plant-mediated response.”
t0“White Clover”
t1“Twospotted Spider Mite”
The same questions in other papers
ozone · physiology: pigments · Trifolium repens (white clover)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.