Dynamic Interactions between Parasitoids and Their Host, Plutella xylostella (Lepidoptera: Plutellidae) on Brassicaceous Crops

Herlinda, Siti (2004) Dynamic Interactions between Parasitoids and Their Host, Plutella xylostella (Lepidoptera: Plutellidae) on Brassicaceous Crops. AGRIA, 1 (1). ISSN 1829-779X

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      Abstract

      Research was conducted from January to November 2003 in the Province of South Sumatera. The objectives of the research were to analyze the rate of the parasitoid parasitism affected by external factors, to evaluate the interactions between parasitoid and its host, diamondback moth (DBM) eggs and larvae, and to analyze effect of the parasitization on leaf damage by diamondback moth (Plutella xylostella) larvae. The research consisted of the field and laboratory observations. The field observation was done to collect the egg and larval parasitoids, and to study population and damage by P. xylostella on Brassicaceous crops. The laboratory observation was carried out to identify parasitoid species found on the crops, and to determine the P. xylostella parasitism by the parasitoids. Rates of the egg and larval parasitism by the parasitoids were greatly affected by insecticide application, and were also affected by crop phenology. The field treated by scheduled application of insecticide had generally low parasitism. The parasitization tended to be higher at weedy brassicaceous fields and intercropping systems than at monoculture, and also higher at earlier growing season than at later date. However, the rate of parasitization by egg parasitoids, Trichogramma spp., tended to follow the development of DBM eggs, and the rate of parasitization by larval parasitoids, Diadegma semiclusum or Cotesia sp., also tended to follow their host population. Thus, they were density dependent parasitoids. The rates of the parasitization affected the damage by DBM larvae on brassicaceous leaves. The leaf damage by DBM larvae decreased with increasing parasitization by the parasitoids. The heaviest infestation occurred when the parasitization was the lowest.

      Item Type: Article
      Uncontrolled Keywords: parasitoids, Plutella xylostella, brassicaceae
      Subjects: S Agriculture > S Agriculture (General)
      S Agriculture > SB Plant culture
      Divisions: Faculty of Agriculture > Department of Plant Pests and Diseases
      Depositing User: Candra Setiawan
      Date Deposited: 22 Jan 2012 04:05
      Last Modified: 05 Mar 2012 20:46
      URI: http://eprints.unsri.ac.id/id/eprint/239

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