Enhancing the effectiveness of the parasitoid Diadegma semiclausum (Helen): Movement after use of nectar in the field

Lavandero, Blas; Wratten, Stephen D.; Shishehbor, Parviz; Worner, Sue

doi:10.1016/j.biocontrol.2005.04.013

Cited by 163 publications

(115 citation statements)

References 32 publications

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“…Ten coccinellid individuals per species, captured before the rubidium applications, were used as blanks. A sample was considered positively labeled if the concentration of rubidium was more than three times the standard deviation of the average base level of the coccinellids caught before Rb application in the experimental field thus ensuring a conservative threshold with a type I error not exceeding 0.13% (Lavandero et al, 2005).…”

Section: Rubidium Concentration Analysismentioning

confidence: 99%

Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

et al. 2013

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To determine whether thistles growing at crop edges act as a putative refuge for natural enemies, the seasonal relative abundance of aphidophagous coccinellids was estimated at 0, 10 and 25 m from the edges of three alfalfa fields. Mark-recapture studies were carried out using the trace element rubidium (Rb) to determine whether coccinellids moved between the edges and the alfalfa. The most common aphidophagous coccinellid species were Hippodamia convergens (63%), H. variegata (11%), Rhyzobius lophantae (4%) and Adalia angulifera (4%). In mid-November, the abundance of coccinellids at the edge of (0 m from the edge) the alfalfa plot increased compared to that at the center of the field (25 m from the edge), coinciding with a reduction in the population of aphids at all sampling points. Of the coccinellids captured at the thistle edge, 68% were marked with rubidium, suggesting movement of coccinellids from the alfalfa plot to the thistle growing at its edges. After the thistles were removed, coccinellids returned to the crop, as shown by the presence of marked coccinellids within the alfalfa fields at all three sampling distances. The results of this study suggest that thistles can act as a refuge for coccinellids when aphids are not available in the alfalfa fields.

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Section: Rubidium Concentration Analysismentioning

confidence: 99%

Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

et al. 2013

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“…Performance of natural enemies is enhanced in mixed cropping systems, because these systems provide a variety of microhabitats and alternative prey (Root, 1973). However, parasitoids benefited from more diversified systems since the flower resources provide them additional source of food (Lavandero et al, 2005). In review of 42 different studies that compared parasitiod density and parasitism rates Coll (1998) reported that in two third of studies were more abundant and attacked more herbivores in intercropping system then in monoculture.…”

Section: Presence Of Natural Enemiesmentioning

confidence: 99%

Crop Diversification Affects Biological Pest Control

Marković

2013

AGR

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Crop monocultures encourage the multiplication and spread of pest insects on massive and uniform crop. Numerous studies have evaluated the impact of plant diversification on pests and beneficial arthropods population dynamics in agricultural ecosystems and provided some evidence that habitat manipulation techniques like intercropping can significantly influence pest control. This paper describes various potential options of habitat management and design that enhance ecological role of biodiversity in agroecosystems. The focus of this review is the application and mechanisms of biodiversity in agricultural systems to enhance pest management.

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“…As alternative food sources were extremely rare in the studies by Lee et al (2006), they suggest between-treatment dispersal of a least 67 m for D. insulare. Thompson (2002) suggests that D. semiclausum travels more than 400 m within 12 h, with a net replacement distance of 55 m. Lavandero et al (2005) found that D. semiclausum can move 80 m within four days. For the brachonid wasp Dolichogenidea tasmanica Scarratt et al (2008) could demonstrate migration up to 30 m at least.…”

Section: Discussionmentioning

confidence: 99%

Assessing risks and benefits of floral supplements in conservation biological control

et al. 2010

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The use of flowering field margins is often proposed as a method to support biological control in agro-ecosystems. In addition to beneficial insects, many herbivores depend on floral food as well. The indiscriminate use of flowering species in field margins can therefore lead to higher pest numbers. Based on results from field observations and laboratory experiments we assessed risks as well as benefits associated with the provision of nectar plants in field margins, using Brussels sprouts as a model system. Results show that Brussels sprouts bordered by nectar plants suitable for the cabbage white Pieris rapae L., suffered higher infestation levels by this herbivore. In contrast, nectar plants providing accessible nectar for the diamondback moth Plutella xylostella L., did not raise densities of P. xylostella larvae in the Brassica crop. Margins with Anethum graveolens L., selected on the basis of its suitability as nectar plant for parasitoids, significantly increased the number of adult Diadegma semiclausum Hellén in the crop. This didn't translate into enhanced parasitism rates, as parasitism of P. xylostella by D. semiclausum exceeded 65 % in all treatments, irrespective of the plants in the field margin. Our findings emphasize the importance of taking a multitrophic approach when choosing flowering field margin plants for biocontrol or other ecosystem services.

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Enhancing the effectiveness of the parasitoid Diadegma semiclausum (Helen): Movement after use of nectar in the field

Cited by 163 publications

References 32 publications

Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

Crop Diversification Affects Biological Pest Control

Assessing risks and benefits of floral supplements in conservation biological control

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