Leafhoppers (Homoptera: Cicadellidae) were surveyed in Western Oregon
vineyards in 1999. Four sites were sampled for leafhoppers using a sticky trap
method, and 29 vineyards were sampled for leafhoppers using a sweep net method in
the summer of 1999. The sticky trap and sweep net methods were chosen based on
cost, ease of use, and the fact that they are commonly used tools available for growers
and IPM programs. Populations varied according to sample method, date, location,
height, agricultural practices, and growing region. Each method resulted in the
capture of different leafhopper species. Sticky traps attracted, and caught mobile
insects such as the winged adults. The sweep net captured leafhoppers of all stadia
from the vegetation. There was seasonal variation seen for each leafhopper group.
Greatest numbers of leafhoppers were caught on the border and edges of the vineyard,
presumably because of the surrounding vegetation providing refuge and food. The
height of catch was dependent upon the preferred host plant of the leafhopper.
Species that feed on the grapevine were generally found in the canopy from 90 to 150
cm above the soil surface. Vineyard management influenced abundance and diversity
within the sites. Those vineyards using the least input had the highest diversity and
lowest overall abundance of leafhoppers. Chemical use, irrigation, and cover crop
choice influenced the species composition of the vineyard. The sites to the south of
the Willamette Valley had a higher abundance of the species Psamotettix sp. The
community structure of leafhoppers appeared to be more similar in the southern sites
to California.
The vineyards that had a diverse mix of plants in the cover crop had a more
diverse population of leafhoppers. Most species found in this study feed on
herbaceous plants that are common as vineyard ground cover. The cover crop that
most low input management sites use may increase the number of leafhoppers that
feed on the vine, but the presence of a cover crop has many advantages in the
vineyard system. / Graduation date: 2001
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/32752 |
| Date | 08 September 2000 |
| Creators | Viguers, Leslie M. |
| Contributors | Fisher, James R., Fisher, Glenn C. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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