Abstract
Abstract Predatory feeding on Tetranychus urticae Koch (Acari: Tetranychidae) populations on cotton by phytophagous thrips, Thrips imaginis Bagnall, T. tabaci Lindeman and Frankliniella schultzei Trybom (Thysanoptera: Thripidae), was investigated in the field and laboratory. Phytophagous thrips are a common early season pest of cotton in Australia, though their true pest status is undefined. In California, the phytophagous thrips ( Frankliniella occidentalis (Pergande)) is regarded as an opportunistic predator of mite eggs, their consumption of which increases fitness over a diet of leaf tissue alone. Thrips are among the most abundant of insects on young cotton. If they consume mite eggs, even at relatively low rates, they could have a significant influence on the probability of survival of early season spider mites. Consumption of eggs of T. urticae by thrips was investigated in the laboratory. Second instar F. schultzei consumed more eggs per day (ca. 4 eggs per day) than did second instar T. tabaci or T. imaginis (ca. l egg per day). Consumption by first instar F. schultzei was much lower than for second instars. Adult T. tabaci consumed ca. l egg per day whilst adults of F. schultzei consumed only ca. 0.5 eggs per day, although some individuals of this species did consume substantial numbers of eggs. Larvae of all thrips species showed a type II functional response to prey density. In the field, adults and larvae of T. tabaci and F. schultzei showed a preference for cotton seedlings that were also infested by spider mites. In a glasshouse, larvae of T. tabaci showed a highly significant preference for feeding within mite colonies. In the field, suppression of predators, predominantly T. tabaci and F. schultzei , with a broad spectrum insecticide (dimethoate) contributed to outbreaks of mites occurring earlier than they would have otherwise. The results show that phytophagous thrips eat mite eggs and that they are potentially important predators of spider mites in the field, especially given their abundance on young cotton and preference for inhabiting situations in which mite colonies are found.
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Claims 8
Claim · model-written summary
Second-instar F. schultzei consumed more T. urticae eggs per day than T. tabaci or T. imaginis.
- Taxon
- cotton
Gossypium hirsutume1 - Interactor
- F. schultzeiFrankliniella schultzeie0biocontrol_agent
- Second interactor
- T. tabaci
Thrips tabacie0biocontrol_agent - Outcome
- F. schultzei consumed more eggs per daye0
- Direction
- moree0
- Value
- ca. 4 eggs per daye0
- Comparator
- T. tabaci or T. imaginise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Second instar F. schultzei consumed more eggs per day (ca. 4 eggs per day) than did second instar T. tabaci or T. imaginis (ca. l egg per day)”
e1“populations on cotton”
Claim · model-written summary
First-instar F. schultzei consumed fewer mite eggs than second instars.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- F. schultzeiFrankliniella schultzeie0biocontrol_agent
- Outcome
- Consumption by first instar F. schultzeie0
- Direction
- lowere0
- Comparator
- second instarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Consumption by first instar F. schultzei was much lower than for second instars”
e1“populations on cotton”
Claim · model-written summary
Adult T. tabaci consumed about one mite egg per day.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- T. tabaciThrips tabacie0biocontrol_agent
- Outcome
- Adult T. tabaci consumede0
- Value
- ca. l egg per daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adult T. tabaci consumed ca. l egg per day”
e1“populations on cotton”
Claim · model-written summary
Adult F. schultzei consumed about 0.5 mite eggs per day.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- F. schultzeiFrankliniella schultzeie0biocontrol_agent
- Outcome
- adults of F. schultzei consumede0
- Value
- ca. 0.5 eggs per daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adults of F. schultzei consumed only ca. 0.5 eggs per day”
e1“populations on cotton”
Claim · model-written summary
Thrips larvae of all species had a type II functional response to prey density.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- type II functional responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Larvae of all thrips species showed a type II functional response to prey density”
e1“populations on cotton”
Claim · model-written summary
Field adults and larvae of T. tabaci and F. schultzei preferred mite-infested cotton seedlings.
- Taxon
- cottonGossypium hirsutume0
- Interactor
- spider mitesTetranychidaee0pest
- Second interactor
- T. tabaciThrips tabacie0biocontrol_agent
- Outcome
- preference for cotton seedlings that were also infested by spider mitese0
- Setting
- In the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the field, adults and larvae of T. tabaci and F. schultzei showed a preference for cotton seedlings that were also infested by spider mites”
Claim · model-written summary
T. tabaci larvae significantly preferred feeding within mite colonies in a glasshouse.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- T. tabaciThrips tabacie0biocontrol_agent
- Outcome
- preference for feeding within mite coloniese0
- Setting
- glasshousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a glasshouse, larvae of T. tabaci showed a highly significant preference for feeding within mite colonies”
e1“populations on cotton”
Claim · model-written summary
Dimethoate suppression of thrips predators contributed to earlier field mite outbreaks.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- broad spectrum insecticide (dimethoate)e0
- Interactor
- mitese0pest
- Second interactor
- T. tabaciThrips tabacie0biocontrol_agent
- Outcome
- outbreaks of mitese0
- Direction
- earliere0
- Comparator
- otherwisee0
- Setting
- In the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the field, suppression of predators, predominantly T. tabaci and F. schultzei , with a broad spectrum insecticide (dimethoate) contributed to outbreaks of mites occurring earlier than they would have otherwise”
e1“populations on cotton”
The same questions in other papers
dimethoate · pest · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →insecticide · pest · Gossypium hirsutum (cotton)Results differ
24 papers in the same direction as this paper · 51 in the opposite direction
- positive
- positive
- positive
72 papers more in this group
See all 76 papers →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.