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Effect of Spraying of Insecticides on the Prevalence of Larval Parasitoid, Trathala Flavoorbitalis

S. N. Alam
Principal Scientific Officer
Entomology Division, BARI, Gazipur

A.K.M.Z. Rahman
Senior Scientific Officer
Entomology Division, BARI, Gazipur

Md. Akhtaruzzaman Sarkar
Scientific Officer
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

Parasitism efficiency of Trathala flavoorbitalis on brinjal shoot and fruit borer larvae at different insecticide frequecies were evaluated in the field and IPM laboratory of Entomology Division, BARI, Gazipur during December 2006 to May 2007. Percent parasitism by T. flavoorbitalis in the non-sprayed plots was significantly higher than the sprayed plots, which was followed by spraying of insecticides at 15 days interval (DI) and 07 DI. No parasitisation was recorded in the plots where insecticides were sprayed at 01 DI.

Keywords: Insecticides, prevalence, larval parasitoid, Trathala flavoorbitalis

Location: Gazipur

Start Date: 10-10-2006

End Date: 25-05-2007

Program Area: Pest Management

Commodity: Insecticide

Objectives:

1) To identify the egg parasitoids of brinjal shoot and fruit borer

2) To know the abundance and prevalence of egg parasitoids on brinjal shoot and fruit borer

Methodology:

Brinjal plants of Chaga variety was transplanted in four isolated plots of 10m x 10m each at 200 m from each other at Entomology Division experimental field during October 2006. There were four treatments depending on four different insecticde spray schedules: T1 = No spray, T2 = Spray at 15 days interval, T3 = Spray at 07 days interval, T4 = Spray at 01 days interval.The experiment was laid out in RCB design with 4 dispersed replications. Forty infested brinjal shoots were collected per plot (replication) at fortnightly interval from the brinjal fields from December 2006 to May 2007. Collected infested brinjal shoots were carried to the laboratory and placed on a tray (35x22 cm) having sterilized sand (4 cm depth). The infested shoots were kept in the cages until the larvae came out from the shoots and pupation starts. Pupae were collected and recorded after gently checking the damaged plant parts and sands. The collected pupae were placed on a petridish (11 cm diameter) and the petri dish along with pupae was then placed in wooden rearing cage (42x30x27cm) having windows netting with 32 mesh net for adult or parasitoid emergence. The observation was continued for 9-10 consecutive days till the entire pupal cocoon bursts. The number of adult BSFB and parasitoids Trathala flavoorbitalis emergence were counted and recorded everyday. The percent parasitisms were then calculated

Source of Information: Annual Report 2006-2007, Entomology Division, BARI , Gazipur

Article Link (Online Journal):

Funding Source:

1.	Budget: 35000.00

Total Budget (Tk.) : 35000.00

Achievement/Findings:

Percent parasitism by T. flavoorbitalis in the non-sprayed plots was significantly higher than the sprayed plots, which was followed by spraying of insecticides at 15 days interval (DI) and 07 DI. No parasitisation was recorded in the plots where insecticides were sprayed at 01 DI.

Knowledge Management: Report/Proceedings