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Comparative Prey Consumption of a Predatory Spider, Pardosa Pseudoannulata (bosenberg and Strand) on Three Different Diets

M. Mala
Department of Entomology, Bangladesh Agricultural University Mymensing-2202, Bangladesh

M. Jahan
Department of Entomology, Bangladesh Agricultural University Mymensing-2202, Bangladesh

K. S. Islam
Department of Entomology, Bangladesh Agricultural University Mymensing-2202, Bangladesh

Abstract/ Executive Summary:

Prey consumption efficiency of the wolf spider, Pardosa pseudoannulata (Boesenberg and Strand) preying on brown planthopper (BPH), Nilaparvata lugens (Stål), green leafhopper (GLH), Nephotettix virescens (Distant) and drosophila, Drosophila melanogaster was investigated in the laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh during the period from June 2008 to April 2009. Depending on the instars and maturity, the spiders were grouped into four different age classes, namely Class I (3^rd and 4^th instars), Class II (5^th and 6^th instars), Class III (7^th and 8^th instars) and Class IV (egg bearing female). When the spiders of each class was supplied with sufficient number of BPH, GLH and Drosophila then the order of the prey consumption of Class I spider was BPH > drosophila > GLH and the order of the prey consumption of Class II, Class III and Class IV were BPH > GLH > drosophila. But in two cases BPH was highly preferred over drosophila and GLH in a mixed diet.

Keywords: Pardosa pseudoannulata, Brown planthopper, Green leafhopper, Drosophila, Age class

Location: Department of Entomology, Bangladesh Agricultural University Mymensing

Start Date: 00-06-2008

End Date: 00-04-2009

Program Area: Pest Management

Commodity: Insects

Objectives:

To investigate the predation efficiency of the wolf spider P. pseudoannulata on BPH, GLH and drosophila diet.

Methodology:

The experiments were carried out in the laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh during the period from June 2008 to April 2009 in controlled condition. BPH and GLH were reared on susceptible rice Variety TN1 (Taichung Native 1). Generally 40-45 days old potted rice plant were used for mass rearing purpose. For mass rearing, 40 pairs of sexually matured female and male drosophila were kept in 10 plastic vials containing artificial medium. Each vial contains 4 pairs of drosophila. Some sexually matured wolf spider, P. pseudoannulata adults with egg sac were collected from the seedbed using an aspirator. Each of the collected spiders was kept immediately in test tube individually. They were supplied with BPH as prey. When eggs were hatched, all of the spiderlings were crowed on the back of the mother spider. When newly hatched spiderlings were detached from her mother's back, they were transferred to another same sized pot. Spiders were divided into four different age classes; viz. Class I (3^rd and 4^th instars), Class II (5^th and 6^th instars), Class III (7^th and 8^th instars) and Class IV (egg bearing female). All different age classes of spider, Class I, Class II, Class III and Class IV were kept individually inside the lamp chimneys which were starved for 24 hours. Each of the starved spiders was supplied with adult of 15 BPH, 15 GLH and 15 drosophila as a mixed food. The spiders were allowed to take food for 24 hours. Data were recorded on the number of BPH, GLH and drosophila consumed by the spiders. There were five replications for each class of spider. The experiments were laid out in a completely randomized manner. The ANOVA were made and mean were separated by Tukey's pairwise comparisons test (MINITAB 32 bit).

Source of Information: Progress. Agric. 20(1 & 2) : 57 – 62, 2009, ISSN 1017-8139

Article Link (Online Journal): http://www.banglajol.info/index.php/PA/article/view/16850/11828

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

P. pseudoannulata is recognized as a significant biological control agent of insect pests in rice. It can be concluded that the predator wolf spider, P. pseudoannulata preferred BPH highly over GLH and drosophila. So farmer can use P. pseudoannulata for controlling BPH and GLH in their crop field. The present findings will be helpful for the researchers and the farmers to increase the population of P. pseudoannulata in the field as bio-control agent.

Knowledge Management: Journal