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Rearing and Developmental Period of Different Trichogramma Sp. on Alternative Host Insect

Md. Nazmul Bari
Senior Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Dr. Mohammad Fazle Rabbi
PSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Initiative were made to rear six different species of Trichogramma (Trichogramma chilonis matsumura, T. chilonis, T. japonicum, Trichogramma sp, T. taidea bactrae and T. zahiri on the alternate host Corcyra cephalonica eggs and found except T. zahiri all other Trichogramma were reared successfully on C. cephalonica eggs. Developmental period of the species were 7.33 to 14.5 days in different months.

Keywords: Trichogramma, Rearing, Developmental period,

Location: BRRI, gazipur

Start Date: 01-07-2006

End Date: 30-06-2007

Program Area: Pest Management

Commodity: Rice

Objectives:

To study the developmental period and their survival on an alternate host of different of Trichogramma sp.

Methodology:

Attempts were made to rear five different species of Trichogramma, (an egg parasitoid ) on rice moth, Corcyra cephalonica (a stored grain insect).The parasitoids were received from SPPS-DANIDA-IPM project and the species were Trichogramma chilonis matsumura, T. chilonis, T. japonicum, Trichogramma sp, and T. taidea bactrae. Another species of Trichogramma i.e T. zahiri collected from the rice field and try to rear along with these five trichogramma species. The trials were carried out from January to June 2007. Continuous culture of the rice moth was established on wheat flour to supply eggs regularly for Trichogramma rearing. Rice moth egg cards (1.5 X 10 cm art paper card) were prepared and thin layer of non toxic gum was spread on the one third length of art paper card on one surface. About 200 rice moth eggs were spread evenly on the gum and allowed to dry for a few minutes. After drying, a single egg card was placed in a test tubes with pre-emerged different species of Trichogramma adults separately. Trichogramma adults were allowed to lay eggs on the C. cephalonica eggs for one night. When C. cephalonica eggs turned blackish within 3-5 days they were transferred to fresh test tube and reared for emergence of Trichogramma adults.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2006-2007

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

All five different species of Trichogramma i. e., Trichogramma chilonis matsumura, T. chilonis, T. japonicum, Trichogramma sp, T. taidea bactrae which collected from SPPS-DANIDA-IPM project were reared successfully on C. cephalonica eggs. The duration of developmental period of different species of Trichogramma in a particular months were more or less similar. The highest developmental period for all species was 13.95 to 14.5 days in January and lowest in June 7.33 to 7.59 days. The rate of developmental period gradually decreased from January to April and remained more or less stable from April to June. But Trichogramma zahiri not developed on C. cephalonica eggs.

Knowledge Management: Report/Proceedings