Abstract
Abstract A 2-year commercial-scale study was conducted to qualitatively evaluate the effect of different insecticide treatment regimes on the predator complex attacking Bemisia tabaci (Gennadius) in cotton. In 1996 three insecticide regimes were compared: a rotation of conventional broad-spectrum insecticides or one of two different regimes based on the initial use of the insect growth regulators (IGRs), buprofezin and pyriproxyfen. In 1997 the same three regimes plus an untreated control were compared; split-plots were sprayed once for Lygus hesperus Knight control using a broad-spectrum insecticide. Relative feeding activity for each predator species was compared between treatment regimes by analyzing the gut contents of predators for the presence of whitefly remains using a whitefly-specific enzyme-linked immunosorbent assay (ELISA). The ELISA results were combined with predator density data to obtain a qualitative pesticide impact index for each predator group. In total, we analyzed the gut contents of 32 262 field-collected predators, representing nine different taxa. Of these, Pseudatomocelis seriatus (Reuter), Spanagonicus albofasciatus (Reuter), and spiders consisting primarily of Misumenops celer (Hentz) are shown to be whitefly predators for the first time. Predator populations were usually reduced in plots that received applications of broad-spectrum insecticides for B. tabaci and L. hesperus control, but there were few treatment differences in the proportions of predators containing whitefly remains in their guts. However, the feeding activity of certain predator species in fields sprayed with broad spectrum insecticides was significantly reduced compared with those in IGR-based and control treatments. Overall, insecticide regimes using IGRs were less lethal to the whitefly predator complex than regimes consisting of only conventional, broad-spectrum insecticides, but differences in predator feeding activity on whitefly between the various insecticide treatment regimes were minimal.
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Claims 5
Claim · model-written summary
Three taxa were newly identified as whitefly predators.
- Taxon
- cotton
Gossypium hirsutumt0 - Interactor
- Pseudatomocelis seriatuse0other
- Outcome
- whitefly predatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pseudatomocelis seriatus (Reuter), Spanagonicus albofasciatus (Reuter), and spiders consisting primarily of Misumenops celer (Hentz) are shown to be whitefly predators for the first time.”
t0“in cotton”
Claim · model-written summary
Broad-spectrum insecticides usually reduced predator populations.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broad-spectrum insecticidese0
- Interactor
- B. tabaci
Bemisia tabacie0pest - Outcome
- Predator populationse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Predator populations were usually reduced in plots that received applications of broad-spectrum insecticides for B. tabaci and L. hesperus control”
t0“in cotton”
Claim · model-written summary
Treatment regimes produced few differences in proportions of predators with whitefly remains.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- proportions of predators containing whitefly remainse0
- Direction
- few treatment differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were few treatment differences in the proportions of predators containing whitefly remains in their guts.”
t0“in cotton”
Claim · model-written summary
Broad-spectrum insecticides significantly reduced feeding activity of certain predators relative to IGR and control treatments.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broad spectrum insecticidese0
- Outcome
- feeding activity of certain predator speciese0
- Direction
- reducede0
- Comparator
- IGR-based and control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the feeding activity of certain predator species in fields sprayed with broad spectrum insecticides was significantly reduced compared with those in IGR-based and control treatments.”
t0“in cotton”
Claim · model-written summary
IGR regimes were less lethal to whitefly predators than conventional insecticides.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- insecticide regimes using IGRse0
- Outcome
- lethal to the whitefly predator complexe0
- Direction
- less lethale0
- Comparator
- regimes consisting of only conventional, broad-spectrum insecticidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insecticide regimes using IGRs were less lethal to the whitefly predator complex than regimes consisting of only conventional, broad-spectrum insecticides”
t0“in cotton”
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See all 8 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.