Establishment and early impact of the native biological control candidate Pyropteron chrysidiforme on the native weed Rumex obtusifolius in Europe

Hahn, Min A.; Schaffner, Urs; Häfliger, Patrick; Luescher, Andreas

doi:10.1007/s10526-016-9715-6

Cited by 6 publications

(15 citation statements)

References 20 publications

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“…The two biocontrol candidates P. chrysidiforme and P. doryliforme share all these characteristics. It is thus not surprising that their interaction was driven by interference competition, and our results support earlier notions that larval densities of P. chrysidiforme and P. doryliforme may be regulated by intraspecific competition (Hahn et al 2016;Spafford et al 2008).…”

Section: Intraversus Interspecific Interference Competition Between P...supporting

confidence: 91%

“…In mid-June 2018, Rumex plants were inoculated with the biocontrol candidates by inserting a toothpick with 30 eggs glued on into the soil next to the plant base, as described in Hahn et al (2016). Prior to inoculation, above-ground biomass was cut at 6-7 cm above ground to allow similar conditions concerning sun irradiation and to mimic management.…”

Section: Infestation and Impact Experimentsmentioning

confidence: 99%

“…More recently, the same two Pyropteron species have been proposed for augmentative biocontrol of Rumex obtusifolius in its native range in Europe (Grossrieder and Keary 2004). However, observational and post-release studies in the introduced and in the native range revealed that, despite high numbers of eggs applied, only a low number of Pyropteron larvae were recovered per Rumex plant (Hahn et al 2016;Sagliocco 1991a, 1991b;Spafford et al 2008). Possible reasons for the limited attack rate under field conditions may be predation or parasitism of eggs or of freshly hatched larvae.…”

Section: Introductionmentioning

confidence: 99%

“…Yet, these factors alone are unlikely to explain the low number of early-instar larvae retrieved per plant. Both Spafford et al (2008) and Hahn et al (2016) suggested that the low number of larvae retrieved per plant may be due to intraspecific competition.…”

Section: Introductionmentioning

confidence: 99%

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Competitive interactions affect larval survival of two root-boring weed biological control candidates of Rumex spp

et al. 2022

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In weed biocontrol, the release of multiple candidates has been proposed as a way to increase herbivore load and thus impact on the target weed. However, the use of multiple herbivorous species may reduce overall herbivore load due to interspecific interactions. We assessed whether a combined application of two Pyropteron spp. (Lepidoptera: Sesiidae) with root-boring larvae can increase larval infestation rate and impact on two Rumex weeds (Caryophyllales: Polygonaceae). In a laboratory assay (‘behavioural experiment’), interference competition was assessed by comparing the survival of a single larva (no competition), of four conspecific larvae (intraspecific competition) and of two larvae of each species (interspecific competition). In a common garden study (‘infestation and impact experiment’), the outcomes of competitive interactions were assessed on potted plants with single and mixed species applications of the two Pyropteron species using a replacement design. In the behavioural experiment, larval survival was similarly reduced under intra- and interspecific competition compared to no competition, suggesting strong interference competition among larvae independent of the Pyropteron species. In the infestation and impact experiment, mixed application did only scarcely increase herbivore load. Increased herbivore load was found to increase root decay when applied in an inundative approach by placing eggs directly on Rumex plants. However, a joint application of two Pyropteron species did not increase the impact. We propose that detailed behavioural and impact studies be conducted to assess the likely outcome of using multiple candidates in biocontrol programs to minimize associated risks with multiple species introductions.

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Section: Intraversus Interspecific Interference Competition Between P...supporting

confidence: 91%

Section: Infestation and Impact Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Competitive interactions affect larval survival of two root-boring weed biological control candidates of Rumex spp

et al. 2022

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“…Thus, to mitigate these problems from chemical pesticides, biological control seems as a promising longterm solution for weed control. At present, the biological control of weeds has been attempted through insects (Room et al, 1981;Louda et al, 1998;Cristofaro et al, 2013;Hahn et al, 2016), plant pathogens (Charudattan, 2001;Mishra et al, 2013;Tehranchian et al, 2014) and allelopathic products (Putnam and Duke, 1974;Lin et al, 2004;Iqbal et al, 2009;Mushtaq et al, 2010;Qasem, 2012;Kato-Noguchi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The Weeds Control of a Novel Bioorganic Fertilizer and its Effects on Agronomic Traits of Rice

Li¹

2018

IJAB

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Bio-organic fertilizer (BIO) is usually used as one of effective solutions to control weeds and reduce environmental pollution in agricultural ecosystems. A novel BIO for weed control and nutrient supply was manufactured and field trials at three rice fields were conducted for two years to evaluate its effect. The novel BIO was found to be effective in controlling grass and broad-leaved weeds in rice fields, with an average rate of more than 80% weed suppression. In addition, the BIO treatments significantly increased rice yield (16.3-29.8% relative to control) and yield components (e.g., number of spikes per square meter, plant height, number of kernels per spike). Results from these field experiments have implications for farmers and government agencies in regard for accept ability of bio-organic fertilizer for biological weed control in rice cultivation.

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Can the enemy release hypothesis explain the success of Rumex (Polygonaceae) species in an introduced range?

Costan

Godsoe²,

Bufford³

et al. 2022

Biol Invasions

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The enemy release hypothesis states that introduced plants have a competitive advantage due to their release from co-evolved natural enemies (i.e., herbivores and pathogens), which allows them to spread rapidly in new environments. This hypothesis has received mixed support to date, but previous studies have rarely examined the herbivore community, plant damage, and performance simultaneously and largely ignored below-ground herbivores. We tested for enemy release by conducting large scale field surveys of insect diversity and abundance in both the native (United Kingdom) and introduced (New Zealand) ranges of three dock (Rumex, Polygonaceae) species: R. conglomeratus Murray (clustered dock), R. crispus L. (curly dock) and R. obtusifolius L. (broad-leaved dock). We captured both above- and below-ground insect herbivores, measured herbivore damage, and plant biomass as an indicator for performance. In the introduced range, Rumex plants had a lower diversity of insect herbivores, all insect specialists present in the native range were absent and plants had lower levels of herbivore damage on both roots and leaves. Despite this, only R. crispus had greater fresh weight in the introduced range compared to the native range. This suggests that enemy release, particularly from below-ground herbivores, could be a driver for the success of R. crispus plants in New Zealand, but not for R. conglomeratus and R. obtusifolius.

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Establishment and early impact of the native biological control candidate Pyropteron chrysidiforme on the native weed Rumex obtusifolius in Europe

Cited by 6 publications

References 20 publications

Competitive interactions affect larval survival of two root-boring weed biological control candidates of Rumex spp

Competitive interactions affect larval survival of two root-boring weed biological control candidates of Rumex spp

The Weeds Control of a Novel Bioorganic Fertilizer and its Effects on Agronomic Traits of Rice

Can the enemy release hypothesis explain the success of Rumex (Polygonaceae) species in an introduced range?

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