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Host Preference of Egg Parasitoid on Different Rice Bug Species

Mahfuj Ara Begum
Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Dr. Mainul Haq
CSO and Head
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

The experiment was conducted at Net house and BRRI farm Gazipur to know the host preference of egg parasitoid of two rice bug species; Leptocoria. oratorius and L. acuta during April-October 2005 and April-June 2006 and found that between the two rice bug species, the parasitoid preferred L. oratorius than L. acuta. Leptocoria. oratorius suffered higher egg parasitism 12-40% than L. acuta (0-26%). Different parasitism rate observed in different months and highest egg parasitism rate of 40% by the parasitoid Gryon nixoni was observed in the month of August.

Keywords: Host preference, Egg parasitoid, Rice bug, Species

Location: BRRI, Gazipur

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Pest Management

Commodity: Rice

Objectives:

To know the host preference of egg parasitoid on different rice bug species

Methodology:

Host preference of egg parasitoid of two rice bug species; Leptocoria. oratorius and L. acuta were investigated during April-October 2005 and April-June 2006. Rice bug adults of both species were collected from BRRI farm, Gazipur and confined in pair (male and female) in the potted BR3 rice plants for mating and egg laying. The potted rice plants with freshly laid rice bug eggs were exposed in the rice field for natural parasitism at 7 days interval. The eggs were retrieved after 72 hrs and placed in the test tube to allow parasitoid to come out. Parasitoid species was identified under microscope and counted.

Source of Information: Proceedings of BRRI Annual Internal Review for 2005-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The egg arasitoid of rice bug Gryon nixoni preferred L. oratorius than L. acuta. Leptocoria oratorius eggs suffered from 11.90-40% and that of L. acuta from 14.63-33.33% parasitism by the parasitoid during April- October 2005. Parasitism rate was highest in the month of July (33.33%) and August (40%) for L. oratotius and in L. acuta respectively. During April-June 2006, highest parasitism of L. oratorius was in the month of June (29.63%) and that of L. acuta during May (23.38%). No parasitism occurred from November to March.

Knowledge Management: Report/Proceedings