Skip to Main content Skip to Navigation
Theses

Optimisation de la lutte biologique contre l'acarien Tetranychus urticae en culture de tomate

Abstract : To suppress pest populations to such levels that damage to thecrop is minimized, multiple biological control agents are oftenintroduced in greenhouses. However, negative interactionsamong them, such as intraguild predation, might appear thatcan decrease the effi ciency of the plant protection strategy.Furthermore, plant direct (physical or chemical) defenseshave a negative impact on the pests but might also have animpact on the natural enemies. Therefore, the question iswhether it is possible to limit the negative interactions amongbiological control agents and the infl uence of the crop on thebehavior and development of the natural enemies. To optimizebiological control of Tetranychus urticae, a very problematicpest in tomato greenhouses, the effi ciency of the predatorymite Phytoseiulus macropilis was tested on two cultivars withdifferent trichome densities and concentrations of secondarycompounds, in presence or absence of Macrolophus pygmaeus,a mirid often used to regulate whitefl y populations.During two years, under greenhouse conditions, P. macropiliswell-controlled the population of T. urticae. There was no evidenceof intraguild predation between the two predators, butin the presence of M. pygmaeus, P. macropilis tended to havea more clumped spatial distribution. However, in microcosms,M. pygmaeus fed on P. macropilis eggs. Moreover, P. macropilislaid signifi cantly more eggs on the tomato cultivar with thehighest density of non-glandular trichomes, but this resultwas only observed in microcosms. The different dynami
Document type :
Theses
Complete list of metadatas

Cited literature [234 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01713013
Contributor : Abes Star :  Contact
Submitted on : Tuesday, February 20, 2018 - 9:56:09 AM
Last modification on : Monday, July 6, 2020 - 3:39:57 PM
Long-term archiving on: : Saturday, May 5, 2018 - 9:22:47 PM

File

fix_2FqoZOZf_gigon.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01713013, version 1

Citation

Vincent Gigon. Optimisation de la lutte biologique contre l'acarien Tetranychus urticae en culture de tomate. Amélioration des plantes. Agrocampus Ouest, 2016. Français. ⟨NNT : 2016NSARA080⟩. ⟨tel-01713013⟩

Share

Metrics

Record views

957

Files downloads

481