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Effects of Native Plants and Igrs on the Development of Tetranychus Urticae Koch (acari: Tetranychidae)

N. Naher
Department of Zoology, University of Rajshahi, Rajshahi

T. Islam
Department of Zoology, University of Rajshahi, Rajshahi

M. M. Haque
Department of Zoology, University of Rajshahi, Rajshahi

S. Parween
Department of Zoology, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

Effect of the seed dust of yellow karavi (Nerium oleander L.), flower juice of akanda (Calotropis procera L.) and two IGRs (diflubenzuron and triflumeron) were observed on the development of two-spotted spider mite (TSSM), Tetranychus urticae Koch. The seed dust of yellow karavi and akanda juice delayed the development of T. urticae resulting the elongation of duration of different developmental periods. But, the last stage of development was not affected with these treatments. Similarly, the two IGRs also significantly extended the duration of different developmental stages except deutonymph to adult. The different doses of two plant materials and two IGRs produced different effects on the development of two-spotted spider mite.

Keywords: Tetranychus urticae, Calotropis procera, Nerium oleander, Diflubenzuron

Location: Rajshahi

Start Date:

End Date:

Program Area: Pest Management

Commodity: Insects

Objectives:

The present paper deals with the determination of the effects of seed dust of yellow karavi (Nerium oleander L.), flower juice of akanda (Calotropis procera L.) and two IGRs (Diflubenzuron and Triflumuron) on the development of the TSSM (T. urticae).

Methodology:

The culture of TSSM was maintained on bean plants in the laboratory of the Department of Zoology, Rajshahi University. Adults were collected from the laboratory culture and reared on potted young bean plants. Adult female TSSM were collected with the help of a brush. The females were differentiated by their round caudal end and larger size with pointed posterior end. The females were released on leaf discs in the laboratory. Leaf discs were made with fresh bean leaf without any infestation. The leaf was cut into an area of 1.44 cm²(1.2 cm × 1.2 cm). The leaf disc was then placed on cotton bed on a petridish (5 cm × 1 cm) facing the underside upward. The bed was soaked with water to keep it wet. One or two female TSSM were kept on each disc for two hours. If eggs were laid, the mites were removed from the disc. Only one egg was kept on each disc and the others were removed. In this way required numbers of eggs were collected. Egg to adult development was completed on the leaf disc in the laboratory. Seeds of karavi and flower juice of the akanda (Giant milk weed) were used in this experiment The stock solution was prepared by adding 2 ml of distilled water with 1ml of raw juice. When 0.02 ml of their solution was sprayed on the leaf disc, the dose, obtained was 4632 nl.cm^−2. By adding 4 and 8 ml of water with 1 ml of juice and sprayed on the leaf discs, Thus attaining the doses as 2316 nl.cm⁻² and 1158 nl.cm⁻² respectively. Both the compounds of 0.01 mg weight were separately dissolved in 10 ml of water. When 0.03 ml of each of the solution was sprayed on the leaf disc, the concentration obtained was 5.208 ng.cm⁻². By dissolving 0.02 mg.cm⁻² IGRs in 20 and 40 ml of water, other doses obtained were 2.604 nlcm⁻² and 1.302 nl.cm⁻² respectively Sets of 30 leaf discs treated with each dose of each of the plant extracts or IGRs were prepared. Another 30 untreated leaf discs were placed on the wet cotton bed in petridish as control. The adult females allowed to oviposit on these leaf discs. After egg laying the females were removed, and single egg/disc was kept in all the petridishes that were covered keeping a slight gap to check excessive evaporation. All the eggs were carefully checked once every day and the life stages of TSSM up to adult emergence were recorded. The leaf discs in treated and control batches were changed with fresh discs of treated and untreated ones after 3-4 days. The experiment was carried out from May to July in the laboratory at ca. 20°-23° C.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 25, 2006. pp. 19-22

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Diflubenzuron causes the inhibition of embryogenesis in the egg of several citrus root weevils when they fed on the treated foliage Both the IGRs used here extended the developmental period of T. urticae by delaying the developmental rate. The two plant extracts also slowed down the developmental period. Further experiment can explore more effectiveness of these plant materials and IGRs.

Knowledge Management: Journal