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Control of Two-spotted Spider Mite, Tetranychus Urticae Koch (acari: Tetranychidae) by Predators on Potted Plants

Mst. Mursalin Parvin
Department of Zoology, University of Rjshahi, Rajshahi

Mohd. Mainul Haque
Department of Zoology, University of Rjshahi, Rajshahi

Abstract/ Executive Summary:

Three predators Scolothrips sexmaculatus Pergande, Phytoseiulus persimilis Athias – Henriot and Stethorus punctillum Weise were used to control two-spotted spider mite, Tetranychus urticae Koch on potted bean plants. Mite population increased exponentially on the untreated plants, but on the predator treated plants, increase of mite population was checked and remained within minimum number. Early release of predator checked the mite population earlier and kept it lower than on late released plants. All the three predators may be used as bio-control agents against two-spotted spider mite.

Keywords: Control, Tetranychus urticae, Scolothrips sexmaculatus, Phytoseiulus persimilis, Bio-control agents

Location: Rajshahi

Start Date: 01-09-2006

End Date: 30-06-2007

Program Area: Pest Management

Commodity:

Objectives:

The present research was designed to control T. urticae population by available predators. The used predators are: Scolothrips sexmaculatus Pergande, Phytoseiulus persimilis Athias – Henriot and Stethorus punctillum Weise.

Methodology:

The experiment was conducted at three different times. Three different predators S. sexmaculatus, P. persimilis and S. punctatum were applied in September 2006, April 2007 and June 2007 respectively. For each predator fifteen bean seedlings were grown on clay pot in the premises of Department of Zoology, Rajshahi University. The bean seeds were bedded in the clay pot. The plants were allowed to grow on bamboo-made sticks at height of 1.5m from the ground. The bean seedlings were nourished properly with fertilizers and water. The pots were arranged in three groups (Five pots in a group) as A, B and C. The pots of each group were separately covered by nets. Pots of A was considered as control and B and C as treated. The potted bean plants were infested with T. urticae when they were eight weeks old. The TSSM used for infestation was collected from laboratory culture, which was maintained on potted bean plants in the premises of the Department of Zoology, Rajshahi University for more than two years. Each plant was infested with 20 adult female mites. The mites were released on the bean leaves at 0.5m height by placing the mite- containing plant parts on the host plant. All the 15 plants of three groups were infested with mites in similar way on the same day. The predators S. sexmaculatus, P. persimilis and S. punctatum used in this experiment were collected form bean plants of Rajshahi City Corporation area, where they appeared naturally. They were cultured on T. urticae on mite infested potted bean plants in the laboratory for more than six months in the Department of Zoology, Rajshahi University. The predators were released on the plants of group B after one week of mite infestation and on the plants of group C after three weeks of mite infestation. On each plant 10 adult female predators were released of which five on the leaves at lm height and other five on the leaves at 1.5m height for proper distribution. The predators were transferred on to the host leaf with the help of fine hairbrush Mite population was checked every week on all the plants of group A, B and C continued up to the tenth week of mite infestation. In group B, predator counting was started after one week of mite infestation. But in the group C, where predators were released after three weeks of mite infestation, predator counting was started from fourth week of mite infestation and continued up to tenth week. During each count 15 bean leaves were collected from each group. Mite and predator population were checked on both the surface of each leaf.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 51-54 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present experiment reveals that T. urticae increased exponentially upto the sixth week on controlled plants.. But on the plants where S. sexmaculatus were released, T. urticae population was checked effectively due to predation. Using P. persimilis and S. punctillum as predator, T. urticae population increased exponentially up to 10th week in controlled plot. Due to predation of predators T. urticae population reduced to the minimum number. The early release of predator reduced the mite population earlier in all the case. It may be concluded from the present investigation that all the three predators are effective against T. urticae and can be used as a bio-control agent of the pest.

Knowledge Management: Journal