Abstract
Field trials were conducted to assess the damage potential of two-spotted spider mite (Tetranychus urticae Koch) on cucumber (Cucumis sativus Linnaeus). Young cucumber plants were artificially infested with different densities of T. urticae (5, 10, 15 and 20 mites/ grown up leaf) while uninfested plants acted as control. Post infestation, the plants differed in their support to mite density in accordance with initial infestation density and observation period. Grown up leaves were found to be the most susceptible to mite infestation (5.86 mites/ sq. cm leaf). The number of feeding (chlorotic) patches on cucumber leaves significantly increased from 1.38/sq cm at a pre-count of 5 mites per grown up leaf to 1.71/sq cm leaf at a pre-count of 20 mites as compared to no patch recorded in control. Highly significant negative correlation was recorded between mite population and photosynthetic pigments. Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of 40, 43.63, 45.45 and 47.27 percent at the highest infestation density as compared to control. Results revealed differences among various treatments in terms of yield attributes of cucumber. The per cent reductions from 6.15 to 12.42 in number of fruits, 0.59 to 1.56 in fruit length and 0.93 to 3.28 in fruit width at different inoculums of T. urticae were recorded over uninfested plants. The cumulative effect led to the ultimate reduction in average fruit weight in the range of 10.16 to 17.19 per cent in the infested plants.
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Claims 12
Claim · model-written summary
Mite density after infestation varied with initial infestation density and observation period.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- initial infestation densitye0
- Interactor
- mitee0pest
- Outcome
- mite densitye0
- Qualifier
- observation periode0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plants differed in their support to mite density in accordance with initial infestation density and observation period”
t0“cucumber”
Claim · model-written summary
Grown up leaves were most susceptible to mite infestation, with 5.86 mites per sq. cm leaf.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- Grown up leavese0
- Interactor
- mitee0pest
- Outcome
- mite infestatione0
- Direction
- most susceptiblee0
- Value
- 5.86 mites/ sq. cm leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grown up leaves were found to be the most susceptible to mite infestation (5.86 mites/ sq. cm leaf)”
t0“cucumber”
Claim · model-written summary
Feeding patches increased from 1.38 to 1.71 per sq cm as initial mite density rose from 5 to 20, versus none in controls.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- pre-count of 20 mitese0
- Interactor
- mitese0pest
- Outcome
- feeding (chlorotic) patchese0
- Direction
- increasede0
- Value
- 1.71/sq cm leafe0
- Qualifier
- 1.38/sq cme0
- Comparator
- pre-count of 5 mites per grown up leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of feeding (chlorotic) patches on cucumber leaves significantly increased from 1.38/sq cm at a pre-count of 5 mites per grown up leaf to 1.71/sq cm leaf at a pre-count of 20 mites as compared to no patch recorded in control”
Claim · model-written summary
Mite population was negatively correlated with photosynthetic pigments.
- Taxon
- cucumberCucumis sativust0
- Interactor
- mitee0pest
- Outcome
- photosynthetic pigmentse0
- Direction
- negative correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highly significant negative correlation was recorded between mite population and photosynthetic pigments”
t0“cucumber”
Claim · model-written summary
At the highest mite density, Total chlorophyll decreased by 40 percent versus control.
- Taxon
- cucumberCucumis sativust0
- Treatment
- highest infestation densitye0
- Interactor
- Tetranychus urticae
.jpg?width=60)
Tetranychus urticaet0pest - Outcome
- Total chlorophylle0
- Direction
- decreasede0
- Value
- 40e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of 40, 43.63, 45.45 and 47.27 percent at the highest infestation density as compared to control”
t0“Tetranychus urticae Koch to cucumber”
Claim · model-written summary
At the highest mite density, chlorophyll-a decreased by 43.63 percent versus control.
- Taxon
- cucumberCucumis sativust0
- Treatment
- highest infestation densitye0
- Interactor
- Tetranychus urticaeTetranychus urticaet0pest
- Outcome
- chlorophyll-ae0
- Direction
- decreasede0
- Value
- 43.63e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of 40, 43.63, 45.45 and 47.27 percent at the highest infestation density as compared to control”
t0“Tetranychus urticae Koch to cucumber”
Claim · model-written summary
At the highest mite density, chlorophyll-b decreased by 45.45 percent versus control.
- Taxon
- cucumberCucumis sativust0
- Treatment
- highest infestation densitye0
- Interactor
- Tetranychus urticaeTetranychus urticaet0pest
- Outcome
- chlorophyll-be0
- Direction
- decreasede0
- Value
- 45.45e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of 40, 43.63, 45.45 and 47.27 percent at the highest infestation density as compared to control”
t0“Tetranychus urticae Koch to cucumber”
Claim · model-written summary
At the highest mite density, carotenoids decreased by 47.27 percent versus control.
- Taxon
- cucumberCucumis sativust0
- Treatment
- highest infestation densitye0
- Interactor
- Tetranychus urticaeTetranychus urticaet0pest
- Outcome
- carotenoidse0
- Direction
- decreasede0
- Value
- 47.27e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of 40, 43.63, 45.45 and 47.27 percent at the highest infestation density as compared to control”
t0“Tetranychus urticae Koch to cucumber”
Claim · model-written summary
Mite infestation reduced number of fruits relative to uninfested plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- different inoculums of T. urticaee0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- number of fruitse0
- Direction
- reductionse0
- Value
- 6.15 to 12.42e0
- Comparator
- uninfested plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The per cent reductions from 6.15 to 12.42 in number of fruits, 0.59 to 1.56 in fruit length and 0.93 to 3.28 in fruit width at different inoculums of T. urticae were recorded over uninfested plants”
t0“cucumber”
Claim · model-written summary
Mite infestation reduced fruit length relative to uninfested plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- different inoculums of T. urticaee0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- fruit lengthe0
- Direction
- reductionse0
- Value
- 0.59 to 1.56e0
- Comparator
- uninfested plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The per cent reductions from 6.15 to 12.42 in number of fruits, 0.59 to 1.56 in fruit length and 0.93 to 3.28 in fruit width at different inoculums of T. urticae were recorded over uninfested plants”
t0“cucumber”
Claim · model-written summary
Mite infestation reduced fruit width relative to uninfested plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- different inoculums of T. urticaee0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- fruit widthe0
- Direction
- reductionse0
- Value
- 0.93 to 3.28e0
- Comparator
- uninfested plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The per cent reductions from 6.15 to 12.42 in number of fruits, 0.59 to 1.56 in fruit length and 0.93 to 3.28 in fruit width at different inoculums of T. urticae were recorded over uninfested plants”
t0“cucumber”
Claim · model-written summary
Infested plants had a 10.16 to 17.19 per cent reduction in average fruit weight.
- Taxon
- cucumberCucumis sativust0
- Treatment
- infested plantse0
- Interactor
- Tetranychus urticaeTetranychus urticaet0pest
- Outcome
- average fruit weighte0
- Direction
- reductione0
- Value
- 10.16 to 17.19 per cente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cumulative effect led to the ultimate reduction in average fruit weight in the range of 10.16 to 17.19 per cent in the infested plants”
t0“Tetranychus urticae Koch to cucumber”
The same questions in other papers
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2 papers in the same direction as this paper
- negative
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See all 56 papers →infection · Tetranychus urticae · Cucumis sativus (cucumber)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.