Improving the biocontrol potential of<i>Steinernema feltiae</i>against<i>Delia radicum</i>through dosage, application technique and timing

Beck, Bert; Spanoghe, Pieter; Moens, Maurice; Brusselman, Eva; Temmerman, Femke; Pollet, Sabien; Nuyttens, David

doi:10.1002/ps.3628

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…Examples of this are the study of the control of the first instars of L . bryoniae on Chinese cabbage plants, and the treatment of cabbage heads against M. brassicae and of cabbage plants against Delia radicum (L.) (Diptera: Anthomyiidae) …”

Section: Discussionmentioning

confidence: 99%

Efficacy of entomopathogenic nematodes against larvae of Tuta absoluta in the laboratory

Damme

Beck²,

Berckmoes³

et al. 2016

Pest Management Science

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BACKGROUND: Previous studies have indicated the control potential of entomopathogenic nematodes (EPNs) against Tuta absoluta. Here, the potential of Steinernema feltiae, S. carpocapsae and Heterorhabditis bacteriophora is studied when applied against larvae of T. absoluta inside leaf mines in tomato leaf discs by means of an automated spray boom. RESULTS:The studied EPN species were effective against all four larval instars of T. absoluta but caused higher mortality in the later instars (e.g. fourth instar: 77.1-97.4% mortality) than in the first instars (36.8-60.0% mortality). Overall, S. feltiae and S. carpocapsae yielded better results than H. bacteriophora. Steinernema carpocapsae and H. bacteriophora performed better at 25 ∘ C (causing 55.3 and 97.4% mortality respectively) than at 18 ∘ C (causing 12.5 and 34.2% mortality respectively), whereas S. feltiae caused 100% mortality at both temperatures. Under optimal spraying conditions and with the use of Addit and Silwet L-77 adjuvants, a reduced dosage of 6.8 infective juveniles (IJs) cm −2 yielded equally good control as a recommended dosage of 27.3 IJs cm −2 .CONCLUSION: Under laboratory conditions, S. feltiae and S. carpocapsae showed good potential against the larvae of T. absoluta inside tomato leaf mines. Results need to be confirmed in greenhouse experiments.

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Section: Discussionmentioning

confidence: 99%

Efficacy of entomopathogenic nematodes against larvae of Tuta absoluta in the laboratory

Damme

Beck²,

Berckmoes³

et al. 2016

Pest Management Science

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“…For D. radicum, the net cover likely effected the invasion of Aleochara spp., as lower catches of rove beetles were observed in the trials (Fig. 10), but soilborne antagonists of larval stages such as entomopathogenic nematodes (Andreassen et al 2009;Beck et al 2014) will not be excluded. And again, an attack of larvae by natural enemies, especially arthropods, after having entered the plant is unlikely.…”

Section: Discussionmentioning

confidence: 98%

Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Böckmann

2022

J Plant Dis Prot

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With the reduced availability of effective plant protection products, alternative control measures gain importance. Insect net covers are a promising tool in this regard, because they can reduce pest damage on crop by exclusion of pests. However, as under practical conditions, most crop net covers need to be removed several times during a crop cycle to manage weeds and apply fertilizers, a complete exclusion of pests is not always feasible. In addition, net covers also have an impact on natural enemies, on microclimate, and may cause direct crop damage due to their tracking weight. Therefore, effects of net applications have to be assessed accordingly, depending on the specific crops and pests. In the current paper, effects on pests, on yield, and on the occurrence of diseases are assessed in Chinese cabbage, carrot, and leek. Whereas control of Delia radicum, Phyllotreta spp. and thrips was enhanced, aphids and mining flies showed increased population build ups and caused higher damages under net cover once they had been able to invade. Some plant diseases such as Puccinia spp. and Alternaria spp. did increase under the net covers. Pitfall trap catches in carrots and Chinese cabbage were lower in almost all natural enemy groups monitored under net covers as compared to open field plots. Yield was higher with net coverage in case of Chinese cabbage and leek, but not in carrot. Results are discussed and take into account the exclusion of natural enemies and measured changes in microclimate and photosynthetically active radiation.

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“…Experiments characterizing the impact of BCAs on F. graminearum have been carried out through the phases of the natural interaction between the life cycles of wheat and the pathogen (establishment, colonization and survival of pathogen). This chronological continuity allows to propose ways to improve the use of BCAs and to identify the best application stages during field epidemic [ 15 ] to make them more competitive than conventional agrochemicals. The antagonistic bioassays on detached spikelets were analyzed at different levels (visual notation, DNA quantification and mycotoxin production).…”

Section: Discussionmentioning

confidence: 99%

Biocontrol Agents Reduce Progression and Mycotoxin Production of Fusarium graminearum in Spikelets and Straws of Wheat

Pellan¹,

Dieye²,

Durand

et al. 2021

Toxins

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The aim of this study was to evaluate the interactions between wheat plant (spikelets and straws), a strain of mycotoxigenic pathogen Fusarium graminearum and commercial biocontrol agents (BCAs). The ability of BCAs to colonize plant tissue and inhibit the pathogen or its toxin production was observed throughout two phases of the life cycle of pathogens in natural conditions (colonization and survival). All evaluated BCAs showed effective reduction capacities of pathogenic traits. During establishment and the expansion stage, BCAs provoked an external growth reduction of F. graminearum (77–93% over the whole kinetic studied) and mycotoxin production (98–100% over the whole kinetic studied). Internal growth of pathogen was assessed with digital droplet polymerase chain reaction (ddPCR) and showed a very strong reduction in the colonization of the internal tissues of the spikelet due to the presence of BCAs (98% on average). During the survival stage, BCAs prevented the formation of conservation perithecia of the pathogen on wheat straw (between 88 and 98% of perithecia number reduction) and showed contrasting actions on the ascospores they contain, or perithecia production (−95% on average) during survival form. The mechanisms involved in these different interactions between F. graminearum and BCAs on plant matrices at different stages of the pathogen’s life cycle were based on a reduction of toxins, nutritional and/or spatial competition, or production of anti-microbial compounds.

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Improving the biocontrol potential ofSteinernema feltiaeagainstDelia radicumthrough dosage, application technique and timing

Cited by 9 publications

References 17 publications

Efficacy of entomopathogenic nematodes against larvae of Tuta absoluta in the laboratory

Efficacy of entomopathogenic nematodes against larvae of Tuta absoluta in the laboratory

Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Biocontrol Agents Reduce Progression and Mycotoxin Production of Fusarium graminearum in Spikelets and Straws of Wheat

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