Abstract
Grasshoppers and locusts frequently invade cereal crops from adjacent source habitats. The lack of a simple, reliable sampling method for grasshoppers in cereal crops has hindered both the study of grasshopper dispersal into crops and the evaluation of various management alternatives. Water-filled pan traps were tested as a means of assessing grasshopper abundance. In comparisons of species proportions in sweep net and pan trap samples in fallow fields, there was a good correlation between the two methods, but some differences were noted. In particular, proportions of Chorthippus curtipennis tended to be greater in sweep samples than in pan traps. As a demonstration of the potential of pan traps for study of spatiotemporal dynamics of grasshopper and locust invasion of crops, a grid of pan traps was placed within a field of barley. Geostatistical methods were used to produce maps of grasshopper abundance within the barley field on five occasions during the growing season. Overall, pan traps show promise as a means of studying grasshopper dispersal into field crops.
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Claims 4
Claim · model-written summary
Species proportions from pan traps and sweep nets in fallow fields correlated well, with some differences.
Verbatim
e0“In comparisons of species proportions in sweep net and pan trap samples in fallow fields, there was a good correlation between the two methods, but some differences were noted.”
t0“cereal crops”
Claim · model-written summary
Chorthippus curtipennis proportions tended to be greater in sweep samples than pan traps.
- Taxon
- cereal cropst0
- Interactor
- Chorthippus curtipennis
Chorthippus curtipennise0pest - Outcome
- proportions of Chorthippus curtipennise0
- Direction
- greatere0
- Comparator
- pan trapse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proportions of Chorthippus curtipennis tended to be greater in sweep samples than in pan traps”
t0“cereal crops”
Claim · model-written summary
Pan traps enabled maps of grasshopper abundance in a barley field on five occasions.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Interactor
- grasshoppere0pest
- Outcome
- maps of grasshopper abundancee0
- Value
- five occasionse0
- Setting
- barley fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Geostatistical methods were used to produce maps of grasshopper abundance within the barley field on five occasions during the growing season.”
Claim · model-written summary
Pan traps show promise for studying grasshopper dispersal into field crops.
Verbatim
e0“Overall, pan traps show promise as a means of studying grasshopper dispersal into field crops.”