Spatial Attack Patterns of
Trichogramma pretiosum1
Around Release Sites Compared with a Random Diffusion Model
2

Allen, J. C.; Gonzalez, Daniel Enrique Torres

doi:10.1093/ee/3.4.647

Cited by 11 publications

(10 citation statements)

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“…This study provides some evidence to support this position by Allen and Gonzalez (1974). The two-sample Cramé r-von Mises analyses of the distribution of sticky card catch of T. ostriniae and the distribution of parasitism of O. nubilalis sentinel egg masses found no statistically signiÞcant difference be- tween the pairwise distribution (Table 2).…”

Section: Discussionmentioning

confidence: 54%

“…In a study of attack by T. pretiosum Riley on eggs of the cabbage looper, Tricoplusiani (Hü bner), Allen and Gonzalez (1974) implied that the spatial pattern of attack could be used to infer the dispersal pattern of the parasitoid. This study provides some evidence to support this position by Allen and Gonzalez (1974).…”

Section: Discussionmentioning

confidence: 99%

“…The method described in Rudd and Gandour (1985) for Þtting release-recapture data to the diffusion model was used to characterize the dispersal patterns of T. ostriniae adults from a central release point within each of the study plots in the four potato Þelds. It is well known that the solution to the diffusion model is a normal distribution (Taylor 1978) and that any transect through a two-dimensional normal distribution is a normal distribution in one dimension (Allen and Gonzalez 1974). Therefore, for simplicity in using the diffusion model to characterize the dispersal pattern of T. ostriniae adults in two-dimensional space (the potato plots), it was only necessary to describe the process for the one-dimensional case.…”

Section: Methodsmentioning

confidence: 99%

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Dispersal ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae) in Potato Fields

Chapman¹,

Kuhar²,

Schultz³

et al. 2009

Environ Entomol

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The dispersal ability of Trichogramma ostriniae Pang and Chen, a biological control agent of Ostrinia nubilalis Hübner, was studied in commercial potato fields on the Eastern Shore of Virginia. The purpose was to quantify dispersal of T. ostriniae after an inundative release to aid in determining the number of release points needed per unit area for effective biological control of O. nubilalis in solanaceous crops. A single release of approximately 0.5 million wasps was made in two spatially separate potato fields in summer 2005 and 2006. Each release area contained 25 monitoring points at distances from 5 to 45 m from the release point bearing a yellow sticky card and O. nubilalis egg sentinels to observe for adult parasitoids and parasitism, respectively. Results showed that movement of T. ostriniae adults from the release point was rapid with individuals captured at 45 m within 1 d of emergence. High rates of parasitization (20-50%) also were observed at this distance, but the levels decreased with increasing distance from the release point. The distances that encompassed 98% recaptured T. ostriniae adults (x(98)) were 27.5 and 12.9 m from the release point in 2005 and 2006, respectively. The (x(98)) distances for parasitization of O. nubilalis were 21-26 m in 2005 and 8-10 m in 2006. However, the highest levels of parasitization in both years occurred nearest the release point. T. ostriniae showed uniform dispersal within an area of approximately 0.1 ha, indicating that multiple release points should be used for effective dispersal of T. ostriniae and control of O. nubilalis in solanaceous crops. Based on the assumption that a distance of 16 m represents the radius around a release point in which T. ostriniae activity was at its maximum, we estimate that approximately 12 release points/ha would be required in potato fields.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Dispersal ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae) in Potato Fields

Chapman¹,

Kuhar²,

Schultz³

et al. 2009

Environ Entomol

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“…SMITH (1988) similarly found both that parasitism declined with increasing distance from a release tree in a spruce forest and that the rate of decline diminished over time. However, ALLEN and GONZALEZ (1974) observed the greatest parasitism of sentinel eggs in cotton at a distance of 21 m away from the release point. This suggests that Trichogramma disperse more rapidly in row crops, perhaps due to the smaller plant surface area contained within a 21 m radius of the release point.…”

Section: Discussionmentioning

confidence: 93%

Dispersal of Trichogramma platneri Nagarkatti (Hym., Trichogrammatidae) from point‐source releases in an apple orchard in California

McDougall

Mills

1997

J Applied Entomology

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Egg parasitoids of the genus Trichogramma are commonly released in inundative biological control programmes for lepidopteran pests in a range of cropping systems. In this study we evaluated the dispersal of Trichogramma platneri from a central release point in an apple orchard in relation to time and the number of parasitoids released. Dispersal was monitored by parasitism of codling moth eggs from an insectary culture-used as sentinel eggs. Higher release rates of T. platneri resulted in greater parasitism of sentinel eggs during the first 3 days, increasing from about 18% for a release rate of 5 400 to about 36% for a release rate of 32 400. T. platneri parasitized a greater percentage of sentinel eggs on the north side of the tree. Parasitism of sentinel eggs declined by 50% during the second 3 day period following release from a point source release in comparison to the first 3 day period. Parasitism of sentinel eggs declined from a mean of 62% at the point-source to less than 10% 14 m away during the first 3 days after release.

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“…(Hymenoptera: Ichneumonidae). A number of trichogrammatid species have been shown to parasitize eggs of species in the cabbageworm complex (Oatman et al, 1968;Allen and Gonzalez, 1974;Martin et al, 1976;Godin and Boivin, 2000), including DBM (Glass et al, 1981;Nguyen and Nguyen, 1982;Vattanatangum, 1988), and they have been used to manage these pests.…”

Section: Introductionmentioning

confidence: 99%

Host Preferences of Trichogramma pretiosum and the Influence of Prior Ovipositional Experience on the Parasitism of Plutella xylostella and Pseudoplusia includens Eggs

Pluke

Leibee

2006

Biocontrol

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Trichogramma wasps are generalist egg parasitoids used in biological control efforts. In a multi host situation they may preferentially parasitize a non-target host species to the detriment of the control program. Plutella xylostella Linnaeus (Lepidoptera: Plutellidae) is a very serious pest of cabbage, but is only one in a number of species in the 'cabbageworm' complex. We investigated the host preferences of Trichogramma pretiosum Riley (Hymenoptera: Chalcidoidea) when offered the eggs of Plutella xylostella and the eggs of Pseudoplusia includens Hu¨bner (Lepidoptera: Noctuidae), another species in the 'cabbageworm' complex. Trichogramma pretiosum reared on the eggs of the factitious host Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) parasitized both Plutella xylostella and Pseudoplusia includens eggs under laboratory conditions. For both choice and no-choice experiments, T. pretiosum parasitized significantly more P. xylostella eggs than P. includens eggs. Prior ovipositional experience with one or other of the two host species had no effect on the subsequent parasitism levels of the two host species. The preference for P. xylostella eggs was also not affected by this prior ovipositional experience.

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Spatial Attack Patterns of Trichogramma pretiosum1 Around Release Sites Compared with a Random Diffusion Model 2

Cited by 11 publications

References 0 publications

Dispersal ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae) in Potato Fields

Dispersal ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae) in Potato Fields

Dispersal of Trichogramma platneri Nagarkatti (Hym., Trichogrammatidae) from point‐source releases in an apple orchard in California

Host Preferences of Trichogramma pretiosum and the Influence of Prior Ovipositional Experience on the Parasitism of Plutella xylostella and Pseudoplusia includens Eggs

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