The effects of a windborne pollen-provisioning cover crop on the phytoseiid community in citrus orchards in Israel

Sharon Warburg, Moshe Inbar, Shira Gal, Mor Salomon, Eric Palevsky, Asaf Sadeh

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND: Several phytoseiid species can potentially control the citrus rust mite (CRM). Their effectiveness varies, however, as do their intraguild interactions. Under laboratory conditions, Euseius stipulatus, E. scutalis and Iphiseius degenerans preyed effectively on CRM, whereas Amblyseius swirskii and Typhlodromus athiasae had no effect on CRM. In combination with A. swirskii, Euseius numbers were reduced due to intraguild predation, and consequently CRM suppression was less effective. In the field, predatory mite species can be variably provisioned by windborne pollen released from cover crops such as Rhodes grass (RG). We aimed to determine the effects of RG on the phytoseiid community in two field experiments, on different cultivars (pomelo and Shamouti orange). We also tested these communities for negative interspecific abundance relationships that are expected if their respective laboratory-observed intraguild interactions are manifested in the field. RESULTS: Overall, on pomelo, we observed a dominance of A. swirskii, relatively low E. stipulatus and high CRM abundances. Amblyseius swirskii and E. stipulatus abundances were both elevated near RG, despite apparent intraguild predation by A. swirskii. Conversely, T. athiasae abundances were lower near RG, likely due to predation by A. swirskii. On Shamouti, E. stipulatus abundances were much higher than on pomelo and were not negatively related to A. swirskii abundances. There, RG increased E. stipulatus abundance, and CRM was reduced. CONCLUSION: RG cover cropping can enhance CRM control, depending on variation in intraguild interactions among phytoseiids, particularly between A. swirskii and E. stipulatus. These may be modulated by climatic and/or cultivar effects.

Original languageEnglish
Pages (from-to)405-412
Number of pages8
JournalPest Management Science
Volume75
Issue number2
DOIs
StatePublished - Feb 2019

Bibliographical note

Publisher Copyright:
© 2018 Society of Chemical Industry

Keywords

  • Amblyseius swirskii
  • Euseius stipulatus
  • Phyllocoptruta oleivora
  • Typhlodromus athiasae
  • agroecology
  • intraguild predation
  • mite community ecology
  • windborne pollen provisioning

ASJC Scopus subject areas

  • Insect Science
  • Agronomy and Crop Science

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