Journal of
Plant Breeding and Crop Science

  • Abbreviation: J. Plant Breed. Crop Sci.
  • Language: English
  • ISSN: 2006-9758
  • DOI: 10.5897/JPBCS
  • Start Year: 2009
  • Published Articles: 409

Full Length Research Paper

Seasonal incidence of Plutella xylostella (Lepidoptera: Plutellidae) and its associated natural enemies in major crucifer growing areas of Kenya

Ruth Kahuthia-Gathu
  • Ruth Kahuthia-Gathu
  • Kenyatta University, 43844-00100 Nairobi, Kenya.
  • Google Scholar


  •  Accepted: 05 April 2013
  •  Published: 31 May 2013

Abstract

 

 

Seasonal incidences of Plutella xylostella, diamondback moth (DBM) and its associated natural enemies were investigated in two agro-ecological zones of the major crucifer growing areas of Kenya in 2005 and 2006. DBM larvae and pupae were collected from the cabbage and kale crops grown in farmers’ field and maintained in the laboratory for the emergence of parasitoid or DBM. Four larval, one larval-pupal and one pupal parasitoid species were recorded from DBM. The parasitoids recovered wereDiadegma semiclausum, Diadegma mollipla, Itoplectis spp.Cotesia plutellae, Apanteles spp., Oomyzus sokolowskii and Brachymeria species. D. semiclausum was the most dominant species throughout with highest parasitism rates of over 70% recorded in the highlands. C. plutellaeApanteles and Brachymeria were recovered from mid-altitude semi-arid areas. Generally, parasitism was significantly higher onBrassica oleracea var. capitataD. semiclausum displaced the indigenous parasitoids from B. oleracea var. capitata.

 

Key words: Brassica oleracea, parasitoids, diamondback moth, seasons, agro-ecological zones.