Within-Field Manipulation of Potato Leafhopper (Homoptera: Cicadellidae) and Insect Predator Populations Using an Uncut Alfalfa Strip

The effects of a 3-m wide uncut alfalfa strip on the within field distribution of Empoasca fabae (Harris) (Homoptera: Cicadellidae) and several species of insect predators were examined for 3 yr (1998–2000). The objectives were to determine whether this uncut strip would serve as a trap crop for E....

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Bibliographic Details
Published in:Journal of economic entomology 2003-08, Vol.96 (4), p.1184-1192
Main Authors: Weiser, L. A., Obrycki, J. J., Giles, K. L.
Format: Article
Language:English
Subjects:
alfalfa
Animals
Biological and medical sciences
Control
cultural control
Empoasca fabae
FIELD AND FORAGE CROPS
Fundamental and applied biological sciences. Psychology
Generalities
harvesting
Hemiptera - growth & development
Heteroptera
Medicago sativa
Pest Control, Biological - methods
Phytopathology. Animal pests. Plant and forest protection
Population Density
predator conservation
predator-prey relationships
predatory insects
Protozoa. Invertebrates
refuge habitats
spatial distribution
strip harvesting
temporal variation
trap crops
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Summary:The effects of a 3-m wide uncut alfalfa strip on the within field distribution of Empoasca fabae (Harris) (Homoptera: Cicadellidae) and several species of insect predators were examined for 3 yr (1998–2000). The objectives were to determine whether this uncut strip would serve as a trap crop for E. fabae and a refuge for insect predators at first harvest. Empoasca fabae and insect predators in the families Coccinellidae, Nabidae, Anthocoridae, Chrysopidae, and Hemerobiidae were collected weekly using sweep samples and sticky traps from the uncut strips and up to 40 m into the alfalfa regrowth. For 2 yr, both small- (0.34 ha) and large-scale (≈11.3 ha) field trials showed higher numbers of E. fabae in 73% of the uncut strips for 2–3 wk after harvest. Similarly, the number of insect predators found within
ISSN:0022-0493
1938-291X
DOI:10.1603/0022-0493-96.4.1184