Prey preference by Metaseiulus occidentalis (Acari: Phytoseiidae) and the role of prey aggregation

Hanna, Rachid; Wilson, L. T.

doi:10.1016/1049-9644(91)90101-5

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…On grapevines, this predation effect on T. pacificus was caused by strong predator numerical and functional responses that were probably enhanced by the aggregated spatial distribution of T. pacificus and area restricted search by M. occidentalis (Hanna & Wilson 1991). This study has also shown that the impact of predation on T. pacificus by M. occidentalis can be enhanced by the presence of E. willamettei as alternate prey, particularly during the early growth phase of T. pacificus populations.…”

Section: Discussionmentioning

confidence: 86%

“…All vines were uniform in size and age, with a single shoot and a total of seven leaves for each shoot. Vine and mite source and culture were as described by Hanna & Wilson (1991). Eight days after the addition of spider mites to the vines, all leaves were harvested and chilled to 3 0C, and all stages of spider mites were counted in the laboratory.…”

Section: Greenhouse Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Predation and Competition on the Population Dynamics of Tetranychus pacificus on Grapevines

Hanna¹,

Wilson²,

Zalom³

et al. 1997

The Journal of Applied Ecology

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Section: Discussionmentioning

confidence: 86%

Section: Greenhouse Experimentsmentioning

confidence: 99%

Effects of Predation and Competition on the Population Dynamics of Tetranychus pacificus on Grapevines

Hanna¹,

Wilson²,

Zalom³

et al. 1997

The Journal of Applied Ecology

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“…7). Predaceous mites preferred Pacific mites over Willamette mites in laboratory and greenhouse choice tests (Hanna and Wilson 1991), which might help explain the larger negative path coefficients between predaceous mites and Pacific mites than predaceous mites and Willamette mites during the later part of the season.…”

Section: Discussionmentioning

confidence: 97%

Direct and Indirect Competition Between Spider Mites Feeding on Grapes

English-Loeb¹,

Karban²,

Hougen-Eitzman³

1993

Ecological Applications

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Agents for biological control of arthropod pests have generally come from the trophic level above the pest (predators, parasites, diseases) rather than from the same trophic level (competitors). The rationale behind this approach is twofold. First, interspecific competition among herbivorous arthropods is thought to be weak; populations are kept at low levels through the action of natural enemies. Second, the potential benefits of an herbivorous biological control agent must be weighed against the damage it causes to the host plant through its feeding. In the field we have been successful at using less economically important Willamette mites to control economically important Pacific mites. In greenhouse and field experiments reported here, we examined both direct and indirect mechanisms (via the host plant or a shared predator) to explain this negative interaction. In our first greenhouse experiment we injured leaves on single canes of young Zinfandel grapevines with Willamette mites at four density levels, removed theses mites and then measured consequences of this past injury on Pacific mites placed on newly produced leaves. Pacific mite populations were reduced significantly by previous Willamette mite injury, suggesting a systemic induced response. In our second greenhouse experiment we measured the relative importance of interspecific interactions between concurrent populations of Willamette and Pacific mites, direct predation by a phytoseiid predator, and interactions between predation and competition (apparent competition). Predators and prey were confined to single canes and, at this small scale, direct predation was of overriding importance while interspecific competition and apparent competition were not significant in determining Pacific mite populations. We examined the relative importance of an early season release of Willamette mites, predaceous mites, or both in a large field experiment conducted in a commercial Zinfandel vineyard. Pacific mite populations were most strongly reduced by the early release of Willamette mites and by midseason abundance of predaceous mites. Our ANOVA results did not detect a significant interaction between the early season release of Williamette mites and predaceous mites. The presence of Willamette mites did not make releases of predators more effective at controlling Pacific mites. Grape yield and berry sugar concentration were unaffected by either Willamette mite or predaceous mite treatments in the year of the mite releases nor in the following season. Path analysis showed that Willamette mite density was never strongly negatively correlated with Pacific mite density in the subsequent time period (2-wk intervals between sampling dates), despite the strong negative effect that the early-season release of Willamette mites had on Pacific mite densities later in the season. This suggests that Willamette mites affected Pacific mites indirectly.

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“…The higher r m for G. occidentalis than for E. willamettei suggests that the predatory mite can effectively control the latter over the temperature range suitable for development of either species. However, the more dispersed distribution of E. willamettei than T. pacificus on grape leaves (Hanna and Wilson 1991) may influence the overall effectiveness of the predatory mite in vineyards.…”

Section: Discussionmentioning

confidence: 99%

“…The western predatory mite, Galendromus occidentalis (Nesbitt) (Acari: Phytoseiidae), is an important predator of T. pacificus and E. willamettei in vineyards (Hoy and Smilanick 1981;Hanna and Wilson 1991;Flaherty et al 1992;Bentley et al 2006). In the absence of disruptive pesticide applications (Flaherty and Huffaker 1970;Stavrinides and Mills 2009) the predatory mite seems to provide good control earlier in the season, but fails to prevent outbreaks of T. pacificus during the hot summer months suggesting that higher temperatures may limit its effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

Stavrinides

Mills

2010

BioControl

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We evaluated the influence of temperature on demographic parameters of two common vineyard pests, the Pacific spider mite, Tetranychus pacificus McGregor, and the Willamette spider mite, Eotetranychus willamettei (McGregor) (Acari: Tetranychidae). Additionally, we investigated the effects o f temperature on their shared predator, the western predatory mite, Galendromus occidentalis (Nesbitt) (Acari: Phytoseiidae). The intrinsic rate of increase (r m ) was higher for T. pacificus than E. willamettei at 15 and 28°C, but similar at 22°C. G. occidentalis achieved a higher r m than T. pacificus from 15 to 28°C, but the difference was significant only at 22°C. At 34°C, the r m for both T. pacificus and G. occidentalis was negative, while E. willamettei did not develop at this temperature. Prey species did not affect demographic parameters of G. occidentalis. These results suggest that higher temperatures favor T. pacificus over the less damaging E. willamettei, and may also reduce the effectiveness of G. occidentalis.

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Prey preference by Metaseiulus occidentalis (Acari: Phytoseiidae) and the role of prey aggregation

Cited by 12 publications

References 26 publications

Effects of Predation and Competition on the Population Dynamics of Tetranychus pacificus on Grapevines

Effects of Predation and Competition on the Population Dynamics of Tetranychus pacificus on Grapevines

Direct and Indirect Competition Between Spider Mites Feeding on Grapes

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

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