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Consequence of Some Insecticides on Predator Coccinella Septempunctata

M. M. H. Sikder
M S Student
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka.

M. S. I. Bhuiyan
Professor
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka.

J. Begum
Professor
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka.

Abstract/ Executive Summary:

Studies were undertaken in the field and laboratory to investigate the effects of some insecticides viz., Diazinon, Fenitrothion, Cypermethrin and Chlorpyrifos used against mustard aphid Lipaphis erysimi (Kalt) or the predator, Coccinella septempunctata L. during November 2004 to February 2005 at the Sher-e- BangIa Agricultural University farm, Dhaka. The experiment was laid out in a randomized block design and replicated five times. Insecticides were sprayed @ 0.05% on 27 December 2004 and on 12 January 2005. Records on the mortality of mustard aphid and toxic effect on the predators under the different treatments were made at 1, 4 and 7 days after first and second spraying. The percent reduction of aphid infested plant, percent reduction of aphid population and percent reduction of the predator varied at different level of significant. The mortality of aphid, larvae and adult of the predator were significant at various levels. Mortality of the aphid reached highest after 24 hours of spraying. Cypermethrin was the most effective insecticide causing the highest mortality of mustard aphid and less toxic effect on the predator. Cypermethrin showed higher effectiveness than other three insecticides in increasing various growth parameters and seed yield of mustard. Considering benefit cost ratio (SCR), Cypermethrin was found to be the most economic and effective insecticide in controlling L. erysimi. and most safer for predator lady bird beetle.

Keywords: Insecticides, Predator, Lady bird beetle, Toxicity, Mustard, Aphid

Location: Sher-e-Bangla Agricultural University, Dhaka

Start Date: 01-11-2004

End Date: 28-02-2005

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To evaluate the consequences of some selected insecticides on the predaceous lady bird beetle, Coccinella septempunctata.

Methodology:

The study was laid out at experimental term of Sher-e-Bangla Agricultural University (SAU), Dhaka, Bangladesh during the rabi season, November, 2004 to February, 2005 in randomized completely block design (RCBD) with five replication. There were 5 treatments including an untreated control were considered. The plot size was 4 m x 2.5 m having block to block distance 1 m and plot to plot distance of 0.5m. The variety tori-7 was used as planting materials and seeds were sown in rows. All the test insecticides were liquid formulation and applied @ 0.05%. The application of insecticides was done twice, one in 45 days after sowing (DAS) and 65 DAS for controlling mustard aphids. The egg masses of C. septempunctata were collected from the field and reared in the laboratory to maintain a stock culture. Just after hatching of eggs, two newly hatched grubs were transferred to a petri dishes and 100 mustard aphids of mixed aged and size were supplied to the predator's everyday on a mustard leaf. The base of the leaf was wrapped by a water soaked cotton ball to keep it fresh. The number of aphids consumed by each grub per day was recorded and it was continued up to its pupation. This experiment was laid out in a completely randomized design with five replications. For determining the predation efficiency of adult predator, one male and one female beetle were transferred to new petri dishes. The adult beetles were collected from stock culture. The adults were provided with 150 aphids daily. The number of aphids consumed per adult per day were recorded daily. It was continued up to 30 days. This experiment was laid out in a completely randomized design with five replications. Adults and grubs of the predator were reared on mustard aphids for stock culture as described. At the flowering stage of mustard plant, insecticides were sprayed @ 0.05%. The untreated pots received no insecticides to study the consequence of insecticides on predator grubs and adults the following procedure was adopted. Just after spraying, the treated leaves were collected from the pots and kept in separate pertri dishes under laboratory condition. Five 4^th instar grub were taken from the stock culture and were released in the petri dishes containing treated leaves. The untreated leaves were supplied to the grub in the same way. The mortality counts were taken at 1, 4 and 7 days after insecticide application (DAA).

Source of Information: JOURNAL OF SHER-E-BANGLA AGRICULTURAL UNIVERSITY, Vol. 01 (1), July 2007, pp. 80-89.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the percent reduction of aphid infested plant, percent reduction of aphid population and percent reduction of the predator varied at different level of significant. The mortality of aphid, larvae and adult of the predator were significant at various levels. Mortality of the aphid reached highest after 24 hours of spraying. Cypermethrin was the most effective insecticide causing the highest mortality of mustard aphid and less toxic effect on the predator. Cypermethrin showed higher effectiveness than other three insecticides in increasing various growth parameters and seed yield of mustard. Considering benefit cost ratio (SCR), Cypermethrin was found to be the most economic and effective insecticide in controlling L. erysimi. and most safer for predator lady bird beetle. Almost similar result was obtained with the application of Fenitrothion against C. septernpuncata. It is evident from the study that Cypermethrin would be an appropriate choice for controlling the mustard aphid with minimum toxic affect on LBB.

Knowledge Management: Journal