NDLI: Habitat diversification tactic for improving biological control : parasitism of the western grape leafhopper

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Habitat diversification tactic for improving biological control : parasitism of the western grape leafhopper

Content Provider	Semantic Scholar
Author	Murphy, Bob Rosenheim, Jay A. Granett, Jeffrey R.
Copyright Year	1998
Abstract	In a previous study we demonstrated greater abundance of the parasitoid Anagrus epos(Girault) in grape vineyards located downwind of prune trees that function as overwintering habitats. This study examines whether these higher A. eposnumbers translated into higher egg parasitism rates of the grape leafhopper, Eryth oneura elegantula(Osborn). Paired commercial wine-grape vineyard plots, one with and one without adjacent prune trees, were studied within a complete block design in northern and central California. A. eposwas the key mortality factor affecting E. elegantulaeggs. Point estimates of A. eposparasitism rates were significantly greater in vineyards associated with prune trees during the first E. elegantulageneration in both 1991 and 1992. No consistent differences in parasitism rates were observed during the second or third generations. The results indicated that prune trees enhance early season parasitism rates. Cumulative estimates of egg parasitism across E. elegantulagenerations demonstrated that enhanced early-season parasitism resulted in a net season-long increase in the degree of mortality imposed by A. eposon E. elegantulaeggs. Two factors were found to influence parasitism rates: the abundance of early-season A. eposadults moving into vineyards and the density of E. elegantulaeggs in vineyards. Our results indicate that diversification of vineyards using prune trees supports overwintering populations of a specialist parasitoid and thereby alters host-parasitoid interactions to favor enhanced parasitism in vineyards.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://rosenheim.faculty.ucdavis.edu/wp-content/uploads/sites/137/2014/09/Murphy-et-al.-1998-EEA.pdf
Language	English
Access Restriction	Open
Subject Keyword	Diversification (finance) Empoasca vitis Ephrin Type-B Receptor 1, human Estimated GRAPE Habitat Interaction Population Prunes Trees (plant) parasitism
Content Type	Text
Resource Type	Article

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