Why does the predatory mite Neoseiulus womersleyi Schicha (Acari: Phytoseiidae) prefer spider mite eggs to adults?

Furuichi, H.; Oku, Keiko; Yano, Shuichi; Takafuji, Akio; Osakabe, Masahiro

doi:10.1303/aez.2005.675

Cited by 22 publications

(23 citation statements)

References 7 publications

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“…Ten newly emerged T. urticae females were transferred to each of 70 bean leaf squares, and allowed to construct a web on the leaf surface under laboratory conditions. Since spider mites do not lay eggs within 24 h after adult emergence at 25°C (Furuichi et al 2005), the web remained free of T. urticae eggs. The method described in Furuichi et al (2005) was followed to obtain newly emerged T. urticae females.…”

Section: Mite Culturesmentioning

confidence: 99%

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The presence of webbing affects the oviposition rate of two-spotted spider mites, Tetranychus urticae (Acari: Tetranychidae)

2009

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Several species of tetranychid mites including Tetranychus urticae Koch (Acari: Tetranychidae) construct complicated three-dimensional webs on plant leaves. These webs provide protection against biotic and abiotic stress. As producing web is likely to entail a cost, mites that arrive on a leaf with web are expected to refrain from producing it, because they will gain the benefit of protection from the existing web. Mites that produce less web may then allocate resources that are not spent on web construction to other fitness-enhancing activities, such as laying eggs. To test this, the oviposition rate of T. urticae adult females was examined on leaves with web. As a control, we used leaves where the web had been removed, hence both types of leaves had been exposed to conspecifics previously and were thus damaged. On leaves with web, the oviposition rate of T. urticae females was higher than on leaves where the web had been removed. Therefore, the presence of web constructed by conspecifics enhanced the oviposition rate of T. urticae females. This provides indirect evidence that mites use the web constructed by conspecifics and thereby save resources that can be allocated to other traits that enhance reproductive success.

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Section: Mite Culturesmentioning

confidence: 99%

“…Since spider mites do not lay eggs within 24 h after adult emergence at 25°C (Furuichi et al 2005), the web remained free of T. urticae eggs. The method described in Furuichi et al (2005) was followed to obtain newly emerged T. urticae females. After 24 h, the T. urticae females were removed from the leaf squares.…”

Section: Mite Culturesmentioning

confidence: 99%

The presence of webbing affects the oviposition rate of two-spotted spider mites, Tetranychus urticae (Acari: Tetranychidae)

2009

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“…This influenced the depredation rate by, morphology, prey stage, and the predators' mouth parts , since the integuments of O. yothersi adult females are more difficult to penetrate than those of immature prey (Kishimoto y Takagi, 2001;Furuichi et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Life Table Parameters and Consumption Rate of Cydnodromus picanus Ragusa, Amblyseius graminis Chant, and Galendromus occidentalis (Nesbitt) on Avocado Red Mite Oligonychus yothersi (McGregor) (Acari: Phytoseiidae, Tetranychidae)

2009

Chilean J. Agric. Res.

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The avocado red mite Oligonychus yothersi (McGregor) is the major leaf pest in Chile's avocado orchards. It affects leaf physiology and makes it necessary to seek new natural enemies to interact with low population densities of O. yothersi. The potentiality of three predator mites: Cydnodromus picanus Ragusa, Amblyseius graminis Chant, and Galendromus occidentalis (Nesbitt) was evaluated under laboratory conditions (27 ± 1.93 ºC, 87 ± 3.61% H.R. and 16:8 (L:D) photoperiod) on avocado leaf disks Persea americana Mill. var. Hass (Ø = 5 cm) by separately feeding eggs, immature, and adult females of O. yothersi, and registering postembryonic development, consumption, as well as life table parameters. The postembryonic development of C. picanus was significantly lower (5.46 days) compared to both A. graminis (7.33 days) and G. occidentalis (8.69 days) which were fed with immature O. yothersi. The life table parameters of C. picanus were net reproductive rate R0 = 25.41, finite rate of increase λ = 1.29, and mean generation time T = 12.46. The net intrinsic rate of increase (rm) was significantly higher for C. picanus (rm = 0.25) in contrast with G. occidentalis (rm = 0.19), while A. graminis showed rm = -0.06 indicating that its population didn't have descendants. Under laboratory conditions, rm registered by C. picanus is an indicator of its predatory potential to control O. yothersi. It can be assumed that the pest population reduction pattern could be maintained under field conditions.

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“…The predatory mite, N. womersleyi, prefers T. kanzawai eggs to adult females (Furuichi et al, 2005). To determine whether T. kanzawai excreta affect the foraging behaviour of the predatory mite, 92 leaf squares (10 × 20 mm) were put on water-saturated cotton wool (15 × 25 mm) in a Petri dish and each leaf square divided into two equal parts by a water-saturated thread.…”

Section: Effects Of T Kanzawai Excreta On the Foraging Behaviour Of mentioning

confidence: 99%

Role of excreta in predator avoidance by the Kanzawa spider mite, Tetranychus kanzawai (Acari: Tetranychidae)

Oku¹

2008

Eur. J. Entomol.

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Abstract. The Kanzawa spider mite, Tetranychus kanzawai (Acari: Tetranychidae) constructs webs over leaf surfaces and usually lives under these webs. T. kanzawai produces two types of excreta, black and yellow pellets, and uses its webs as a place for excretion. T. kanzawai also uses its webs as a refuge when the predatory mite, Neoseiulus womersleyi (Acari: Phytoseiidae) is present. To clarify what factors deter N. womersleyi from foraging on T. kanzawai webs, I experimentally examined the effects of T. kanzawai excreta on its own fitness (fecundity) and the foraging behaviour of N. womersleyi. When the excreta of T. kanzawai was put on leaf surfaces, the fecundity of T. kanzawai adult females was reduced by the black but not the yellow faecal pellets. On the other hand, predation by N. womersleyi was reduced by the yellow but not the black pellets. Although this effect of the yellow pellets on N. womersleyi did not last on leaf surfaces, it deterred N. womersleyi from staying on the web regardless of its freshness. These results suggest that T. kanzawai deposits black pellets on webs to avoid its negative effect on their own fitness, and yellow pellets are deposited on webs to reduce the risk of predation.

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Why does the predatory mite Neoseiulus womersleyi Schicha (Acari: Phytoseiidae) prefer spider mite eggs to adults?

Cited by 22 publications

References 7 publications

The presence of webbing affects the oviposition rate of two-spotted spider mites, Tetranychus urticae (Acari: Tetranychidae)

The presence of webbing affects the oviposition rate of two-spotted spider mites, Tetranychus urticae (Acari: Tetranychidae)

Life Table Parameters and Consumption Rate of Cydnodromus picanus Ragusa, Amblyseius graminis Chant, and Galendromus occidentalis (Nesbitt) on Avocado Red Mite Oligonychus yothersi (McGregor) (Acari: Phytoseiidae, Tetranychidae)

Role of excreta in predator avoidance by the Kanzawa spider mite, Tetranychus kanzawai (Acari: Tetranychidae)

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