International Journal on Advanced Science, Engineering and Information Technology, Vol. 8 (2018) No. 3, DOI:10.18517/ijaseit.8.3.1241

Parasitizations Levels and Temperature Tolerance of Rice Bug (Leptocorisa oratorius Fabricus) Egg Parasitoids from West Pasaman Regency, West Sumatera : Effort for Mass Rearing of Biological Control Agents

Fri Maulina, Novri Nelly, Hidrayani Hidrayani, Hasmiandy Hamid

Abstract

Rice bug is one of important pests on paddy crop in West Sumatera include West Pasaman.   Existence of rice bug egg parasitoids in field can be used  as  biological control for pest (its host).   Suitability of temperature in laboratory is one of important factors to parasitoid mass rearing as to  get  the fitness individual to introduce in field.   The objectives of this research were to determine   the parasitization levels  of rice bug egg parasitoids from two topographies in  West Pasaman regency and to get the best temperature for the parasitoids in laboratory.   Purposive random sampling method was used for collecting the sampling and the rice bug eggs samples were collected along 1 km transect lines in rice fields.   The locations of   research were in  low land  (Kinali 56  m asl) and middle land (Talamau  547 m asl).  The descriptive method was used to  report  the parasitization levels.    The   temperature  treatments for rice bug egg parasitoids in laboratory were 20oC, 25oC, 30oC,  and control with 20 replications.   The data was analized with Completely Randomized Design method by used Statistix 8.  The results of research showed that the species of rice bug egg parasitoids which found included Hadronatus leptocorisae and Ooencyrtus malayanensis.  The parasitization levels in  Kinali location  were 6,4% and  2,2%;   Talamau  location were 28,4 % and 3,1%  respectively.   The best temperature for mass rearing parasitoid in laboratory  was  25oC with longevity as  22,6 days.

 

Keywords:

Egg parasitoid, Hadronotus leptocorisae, Ooencyrtus malayanensis, parasitization, temperature, rice bug

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