KEMAMPUAN DAN PERILAKU MEMMARASIT Zrictiograminatoidsa bactrae NAGARAJA (Hymenoptera: Trichogrammatidae) PADA TELUR Plutella xylostella L. (Lepidoptera: Yponomeutidae)

• Main Author: Nurtiati
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/1133
• Institution: Institut Teknologi Bandung

The parasitic potency and behaviour of Trichogrammatoidea bactrae Nagaraja (Hymenoptera Trichogrmmatidae) on Plutella xylostella L. eggs (Lepidoptera: Yponomeutidae). A study on the parasitic potency and behaviour of Trichograsaatoidea bactrae Nagaraja on Plutellaxylostella L. eggs under laboratory conditions has been conducted in November 1989 -July 1990. Parasitization of one-day, two-days and three-days old eggs of P. xylostella by the parasitoid, T. bactrae did not differ significantly. The level of parasitization was highest i.e. 25%, at a density of 30 P. xylostella eggs per tube. The effectivity of parasitization was significantly influenced by temperature. At 60% relative humidity, the highest level of parasitization (39.2%) occured at a temperature of 25°C. The searching efficiency (a) and thekilling capacity (K) of T. bactrae on P. xylostella eggswere highest (a = 0.17; K = 0.52) at a population density of three parasitoid per tube. Mean fecundity of T. bactrae was 37.6 ± 9.8 eggs per female. Each parasitized P. xylostella egg contained on avarage 1.2 ± 0.5 parasitoids (pupal stage). Based on the number of emerged adults the sex ratio of T. bactrae was found to be one male : 1.3 females. The average time needed by the para-itoid in handling its parasitized host egg (th) was 445.2±132.5 seconds. Three phases were recognized, namely, drumming, drilling and oviposition which took on avarage 13.7±3.8 seconds (3.1%), 152.82±43.2 seconds (34.3%) and 278.7 ± 35.3 seconds (62.6%), respectively.