Parasitierung von Rapserdflohlarven

Godan, Dora

doi:10.1007/bf02199428

Cited by 3 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The larval economic action threshold varies from country to country, with treated advised at only one larva/plant in the Czech Republic and Poland, two to three larvae/plant in France, and five larvae/plant in Germany and United Kingdom 4 . However, information on the development of the thresholds and effects of different numbers of larvae is sparse 32,33,66–68 . Our results show that there was no significant yield effect when plants were infested with larvae at GS11‐12 at current European action thresholds of five larvae or lower.…”

Section: Discussionmentioning

confidence: 74%

“…4 However, information on the development of the thresholds and effects of different numbers of larvae is sparse. 32,33,[66][67][68] Our results show that there was no significant yield effect when plants were infested with larvae at GS11-12 at current European action thresholds of five larvae or lower. However, introducing high numbers of larvae (i.e., 25, but with a projected mean infestation rate of 6.5 larvae per plant with a range between 5 and 8), did significantly reduce plant height, flower and pod production, the number of seeds produced, and their quality (lower oil content and higher concentrations of glucosinolate), suggesting that the physiological injury level, the level of injury where a plant begins to ensure yield penalties, 69 for P. chrysocephala larvae is between five and 25 larvae/plant in this experimental set up.…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Quantifying the impact of Psylliodes chrysocephala injury on the productivity of oilseed rape

Coston,

Clark,

Breeze

et al. 2023

Pest Management Science

View full text Add to dashboard Cite

BACKGROUNDCurrent European Union and United Kingdom legislation prohibits the use of neonicotinoid insecticidal seed treatments in oilseed rape (OSR, Brassica napus). This ban, and the reduction in efficacy of pyrethroid insecticide sprays due to resistance, has exacerbated pest pressure from the cabbage stem flea beetle (Psylliodes chrysocephala) in winter OSR. We quantified the direct impact of P. chrysocephala injury on the productivity of OSR. Leaf area was removed from young plants to simulate differing intensities of adult feeding injury alone or in combination with varying larval infestation levels.RESULTSOSR can compensate for up to 90% leaf area loss at early growth stages, with no meaningful effect on yield. Significant impacts were observed with high infestations of more than five larvae per plant; plants were shorter, produced fewer flowers and pods, with fewer seeds per pod which had lower oil content and higher glucosinolate content. Such effects were not recorded when five larvae or fewer were present.CONCLUSIONThese data confirm the yield‐limiting potential of the larval stages of P. chrysocephala but suggest that the current action thresholds which trigger insecticide application for both adult and larval stages (25% leaf area loss and five larvae/plant, respectively) are potentially too low as they are below the physiological injury level where plants can fully compensate for damage. Further research in field conditions is needed to define physiological thresholds more accurately as disparity may result in insecticide applications that are unnecessary to protect yield and may in turn exacerbate the development and spread of insecticide resistance in P. chrysocephala. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

show abstract

Section: Discussionmentioning

confidence: 74%