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Effectiveness of Three Insecticides Against Mustard Aphid and Predator Under Field Condition

A. K. M. M. MAULA
Upazilla Agriculture Officer, Paba, Rajshahi

M. M. R. SHAH
Scientific Officer, Entomology Division, Agricultural Research Station, BARI, Shyampur, Rajshahi

N. A. SIDDQUJE
Scientific Officer, On Farm Research Division, Region-1, BARI, Shyampur, Rajshahi,

M. A. A. MAMUN
5Senior Scientific Officer, Entomology Division, BINA, Mymensingh, Bangladesh.

M. BEGUM
Senior Scientific Officer, Entomology Division, BINA, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

Studies were conducted in the field to determine the effectiveness of three insecticides, Metasystox-R 25EC, Dimethion 40 EC, and Fentro 50 EC applied against mustard aphid, Lipaphis erysimi Kalt. and measure their toxic action on the predator Coccinella septempunctata L. The mustard plants were sprayed with the insecticides at 0.05% and 0.025% a. i. at 50 and 70 days after sowing. The mortality of both mustard aphid and the predator was assessed at 1, 4, and 7 days after first and second spraying of insecticides. Metasystox-R showed the most effectiveness among the three insecticides causing the highest mortality of mustard aphid followed by Dimethion and Fentro. But the lowest mortality of Coccinella septempunctata was obtained in Dimethion treated plot, and Fentro treated plot showed the highest mortality indicating that the Dimethion was less toxic and Fentro was more toxic to the predator.

Keywords: Effectiveness, Insecticides, Mustard, Aphid, Predator

Location: Mymensingh

Start Date: 12-10-2002

End Date: 23-01-2003

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To find out the relative effectiveness of three insecticides, Metasystox-R 25 EC, Dimethion 40 EC, and Fentro 50 EC against mustard aphid and their toxic effect on the predator Coccinella septempunctata.

Methodology:

This study was conducted at the research farm of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh. Three insecticides, namely Metasystox-R 25 EC, Dimethion 40 EC, and Fentro 50 EC were sprayed against mustard aphid, L. erysimi. Two different concentrations of each insecticide at 0.05% and 0.025% a.i. were used. Control plots were not treated with any insecticides. First spray of insecticides was done at 50 and second was at 70 days after sowing (DAS). BINA Sarisha-4, Brassica napus L. of mustard variety was considered as test crop. Mustard seeds were collected from the Genetics and Plant Breeding Division, BINA, Mymensingh. The experiment was conducted in randomized complete block design (RCBD) with 3 replications. The unit plot size was 5 m x 4 m. The spacing between block to block, plot to plot were 1m and 0.5m, respectively. The total area was 660 m² . The plots were exposed to natural infestation. The selected three insecticides were sprayed in the field by a Knapsack sprayer at the dose of 0.05% and 0.025% when the inflorescence, leaves and shoots were found infested by aphids. Insecticides were sprayed at 4 p.m.

Source of Information: Bangladesh J. Agril. Res. 35(1): 179-187, March 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results on percent reduction of aphid infested plants of different treatments after 1, 4, and 7 days of first spraying. At 1 DAT (Days After Treatment) the highest percent reduction of aphid infested plant (71.36%) was observed in the Metasystox-R treated plot at high dose (0.05%), which was followed by its low dose (0.025%). The lowest percent reduction of aphid infested plants (46.20%) was observed in the Fentro treated plots at low dose and was followed by its high dose. At 4 DAT, the highest percent reduction of aphid infested plants (80.40%) was observed in the Metasystox-R treated plot with high dose which was followed by its low dose, and high dose of Dimethion. The lowest percent reduction of aphid infested plants (60.50%) was observed in the Fentro treated plants applied at low dose. At 7 DAT, the highest percent reduction of aphid infested plants was found (67.67%) in the Metasystox-R sprayed plot with high dose and it was statistically identical with that of its low dose, and high dose of Dimethion. The lowest percent reduction of aphid infested plants (40.00%) was observed in Fentro treated plots applied at low dose.Findings of the study indicated that Metasystox-R was the most effective against mustard aphid followed by Dimethion compared to Fentro in respect of aphid infested plants and aphid populations. The use of Fentro was found to be more toxic to the grub and adult of the predator C. septempunctata. Dimethion (0.025%) proved to be safe insecticide to the predator.

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