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Development Duration of Trichogramma Zahiri at Different Constant Temperatures

Md. Nazmul Bari
Senior Scientific Officer
Entomology Division, Bangladesh Rice Research Institute, Gazipur-1701.

Dr. Mahbuba Jahan
Professor
Entomology Division, Bangladesh Rice Research Institute, Gazipur-1701.

Abstract/ Executive Summary:

Developmental duration from egg to adult of Tricogramma zahiri at different temperatures showed that the duration decreased with the increase of temperature upto certain limit and it ranged from 7 to 15.19 days when temperature decreased from 34 to 18ºC.

Keywords: Rice, Trichogramma zahiri, Temperature

Location: BRRI, Gazipur

Start Date: 01-07-2011

End Date: 30-06-.2012

Program Area: Pest Management

Commodity: Rice

Objectives:

To know the development duration of male and female Trichogramma zahiri at different constant temperatures.

Methodology:

Twenty pairs of rice hispa were allowed to lay eggs overnight on potted BR3 rice plants. After egg laying, one or two leaf pieces containing a total of 15-20 rice hispa eggs were kept in a test tube. The lower end of the leaf pieces was wrapped with water soaked cotton wools. Freshly emerged single mated females of T. zahiri was introduced into each test tube for egg laying on rice hispa egg for one day. Honey was provided as the food for the parasitoids in the test tubes. The leaf pieces with parasitized hispa eggs were shifted to a new test tube and a new set of hispa eggs were placed in the original tube. The process was continued till the death of the parasitoid. The test tubes with parasitized eggs were placed in the incubator at 18, 22, 26 30 and 34ºC in 16L : 8D condition. Five test tubes were used for each temperature. The development duration from egg to adult was determined from 5 cohorts each of 20 male and female T. zahiri emergence record at a constant temperature. Thus every trial had 100 replications.

Source of Information: Internal review workshop, 2011-12

Article Link (Online Journal):

Funding Source:

1.	Budget:
2. Bangladesh Agricultural Research Council	Budget:

Total Budget (Tk.) :

Achievement/Findings:

The mean development duration for the male and female ranged from 7.01 to 15.06 days and 7.36 to 15.19 days, respectively. The development duration for both male and female also varied significantly at different temperatures. The development duration for both male and female was longest at 18ºC and shortest at 34ºC. Unlike other Trichogrammatid egg parasitoids, female T. zahiri did not take significantly longer time to reach adulthood. The Turkey’s Post-hoc Test did not show significant variation in the development period of male and females at a particular temperature (P<0.05). It was found that developmental duration of the parasitoid, T. zahiri decreased with the increase of temperature irrespective of sex. The average development duration of T. zahiri from egg to adult at 18, 22, 26, 30 and 34ºC were 15.13, 12.13, 10.28, 7.32 and 7.19 days respectively irrespective of sex. The developmental duration decreased from 15 to 7 days when temperature increased from 18 to 34ºC irrespective of sex. However, the developmental duration remained constant (7 days) at 30 to 34ºC.

Knowledge Management: Report/Proceedings