Abstract:
:We have been releasing economically unimportant herbivorous mites of one species early in the season and protecting grapevines against another, more damaging herbivorous mite throughout the growing season. In this experiment, releases of economically unimportant Willamette mites alone, or of predatory mites alone, failed to reduce populations of the damaging Pacific spider mite. However, where both herbivorous Willamette mites and predatory mites were released together populations of Pacific mites were reduced. This interaction between effects of Willamette mites and predatory mites suggests that predation against Pacific mites was more effective where alternate prey (Willamette mites) were available for the predators. The "apparent competition" between Willamette mites and Pacific mites, mediated through their shared predator, can be an important force in the agroecosystem although its importance varies from year to year and vineyard to vineyard.
journal_name
Oecologiajournal_title
Oecologiaauthors
Karban R,Hougen-Eitzmann D,English-Loeb Gdoi
10.1007/BF00325889subject
Has Abstractpub_date
1994-05-01 00:00:00pages
508-511issue
4eissn
0029-8549issn
1432-1939pii
10.1007/BF00325889journal_volume
97pub_type
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