Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Functional Response of Dinarmus Basalis (rond.) (hymenoptera: Pteromalidae) Parasitizing Callosobruchus Maculatus (f.)

N Islam
Institute of Biological Sciences, Rajshahi University, Rajshahi 6205, Bangladesh

W lslam
Email: mwislam2001@yahoo.com
Institute of Biological Sciences, Rajshahi University, Rajshahi 6205, Bangladesh

K A M S H Mondal
Institute of Biological Sciences, Rajshahi University, Rajshahi 6205, Bangladesh

Abstract/ Executive Summary:

The functional response of the parasitoid Dinarmus basalis (Rond.) (Hymenoptera: Pteromalidae) is determined to evaluate its potential as a biological control agent. Four female wasps in the presence of males parasitoids, were allowed to oviposit during their life span or hosts at different densities. The data were fit by parasitoid model. The rate of parasitoid search was a'= 0.123 ± 0.005 life span^-1, and handling time T_h = 0.056 ± 0.002 life span^-1. Volume of grain had no significant (P>0.001) effect on number of parasitoids emerging.

Keywords: Functional response, Dinarmus basalis, Callosobruchus maculatus

Location: Institute of Biological Sciences, Rajshahi University, Rajshahi

Start Date: 01-01-2000

End Date: 30-06-2001

Program Area: Pest Management

Commodity: Diseases

Objectives:

To test the functional response of D. basalis,

Methodology:

D. basalis and its host C. maculatus were collected from the stock cultures maintained in the insectary separately in the Institute of Biological Sciences, Rajshahi University, Rajshahi, Bangladesh. Three hundred adult beetles were collected and released for oviposition upto 3 days on 300 gm fresh black gram seeds kept in plastic pots. Then the seeds were incubated at 30 ± 0.50? for 22 days to produce large number of larvae and mixed. One hundred gm infested seeds were combined with un infested seeds of 3000 gm have a total grain mass of 3100 gm. The seeds were then divided into 100, 200, 400, 800 and 1600 gm samples, respectively. These samples were placed in glass jars 200, 420, 825, 1550 and 3500 ml, respectively and covered with markin cloth. Four pairs of D. basalis adult of 0 to 24- h- old were placed in each jar and held at 30 ?. Four pairs were used to allow intra specific interactions to occur among foraging females and between sexes, as might occur during inundative releases. All emerged D. basalis and C. maculatus were counted after the emergence ceased, and the eight initial parasitoids were subtracted. Three replicates of control (no D. basalis) and experimental jars were set up for each quantity of grain, and the experiments were preformed three times. Random parasitoid model was used. This model assumes random search behaviour, no discrimination of previously parasitized hosts and constant host population during the time interval. Adequacy of the model was evaluated by examining residuals plotted against predicted values, number of hosts, date and by comparing the mean squares ratio.

Source of Information: JOURNAL OF BIO-SCIENCE, THE INSTITUTE OF BIOLOGICAL SCIENCES RAJSHAHI UNIVERSITY, Vol. 14, 2006, pp. 11-16, ISSN 1023–8654.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study indicates that the number of hosts parasitized by D. basalis is dependent upon the number of hosts available, rather than their density (hosts per volume or surface area), at this spatial scale. This suggests that functional response data collected from different- sized arenas will produce comparable model parameter estimates, provided that the arena is not larger than the area that can be searched in the time available. Whether such conclusions would hold for patchily distributed host in a much larger environment may depend on the efficiency of the parasitoid to locate the host patches, relative to finding hosts within a patch. Such behaviour is likely to involve on different mode of searching. Although the larger spatial scale presents a serious challenge to experimentation, such knowledge is crucial for applying quantitative laboratory results to the development of effective biological control strategies.

Knowledge Management: Journal