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Biology of Predatory Spider, Oxyopes Sp

Mohammad Fazle Rabbi
Principal Scientific Officer
Entomology Division, BRRI, Gazipur-1701

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

Abstract/ Executive Summary:

Rice field is the harbour of different spider species. Among them some of the species are voracious predators of harmful rice insects. The experiment was conducted in the BRRI greenhouse during 2005 to know the biology of the predatory spider Oxyopes sp. was studied in the BRRI greenhouse during 200 and found that on an average 59.2 spiderlings came out from each egg sac. The average incubation period was 11.6 days. The spiderling survived 2-90 days. From 1st-2nd instar spiderling took 20.2 days. Second instar of Oxyopes sp. lasted 13-37 days (Ave.22.6 days) and 3rd instar took 28-52 days (Ave. 36.75 days). Very few spiderling reached to 4th instar.

Keywords: Biology, Predator, Spider

Location: BRRI, Gazipur

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Pest Management

Commodity: Spider

Objectives:

To know the biology of the predatory spider, Oxyopes sp.

Methodology:

The experiment was conducted in the green house and laboratory of Entomology Division BRRI, Gazipur during 2005. Gravid females of Oxyopes sp. were collected from field and captivated in a pair (male and female ) in the test tubes for egg laying. Sufficient number of BPH nymphs were supplied from the BPH culture of Greenhouse. Freshly laid eggs were collected and kept in Petri dish to hatch. After hatching spiderlings were counted. One spiderling was placed in a test tube with cut portion of two rice stem with leaf. Each spiderling was provided with plenty of 1st instar BPH nymphs as food. Stems and the nymph replaced every 2-3 days interval. The experiment was conducted by CRD with 10 replications.

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:

Twenty to 93 (av=59.2) Spiderlings came out from each egg sac. The incubation period was 11 to 13 (Ave. 11.6) days. The spiderling survived 2-90 days. From 1st-2nd instar spiderling took 13-37 days (Ave.20.2 days) Second instar of Oxyopes sp. lasted 13-37 days (Ave.22.6 days) and 3rd instar took 28-52 days (Ave. 36.75 days). Very few spiderling reached to 4th instar. Some of the 2nd and 3rd instar spiderlings died due to some unknown reason.

Knowledge Management: Report/Proceedings