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Integrated Management of Thrips to Enhance Seed Yield of Onion

M. M. Hossain
Scientific Officer
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

K. M. Khalequzzaman
Scientific Officer
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

A. H. F. Fahim
Senior Scientific Officer
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

R. N. Ahmed
Upazilla Agriculture Officer
DAE, Atghoria, Pabna, Bangladesh

M. S. Islam
Agriculture Extension Officer
DAE, Kasba, Brahmanbaria, Bangladesh

Abstract/ Executive Summary:

The field experiment was conducted at SRC, Bogra during Rrabi season of 2013-14 to evaluate the efficacy of biorational and synthetic insecticides against thrips infestation to enhance seed yield of onion.The treatments were T₁= White sticky trap @ 40 trap/ha; T₂= Biopesticide-Bioneem (Azadiractin 3EC) @ 2 ml/litre of water; T₃= Biopesticide-Bioneem (Azadiractin 3EC) @ 2ml/litre of water + White sticky trap @ 40 trap/ha; T₄= Thiamethoxam (Actara 25WG) @ 0.2g/litre of water + White sticky trap@ 40 trap/ha; T₅= Alternate spraying of Biopesticide-Spinosad (Tracer 45SC) @ 0.4ml/litre of water and Bioneem (Azadiractin 3EC) @ 2ml/litre of water and T₆= Untreated control. Alternate spraying of Biopesticide- Spinosad (Tracer 45SC) @ 0.4ml/litre of water and Bioneem (Azadiractin 3EC) @ 2ml/litre of water offered the lowest thrips population (1.92 thrips/ plant and 2.65 thrips /umbel). The highest percentage of thrips population (86.37% in plant and 73.76% in umbel) reduction over control was also obtained from alternate spraying of Biopesticide- Spinosad and Bioneem (Azadiractin 3EC) treated plot followed by Bioneem (Azadiractin 3EC) + White sticky trap treated plot (73.88% and 57.82%). The highest onion seed yield (383.3 kg/ha) and marginal benefit cost ratio (9.55) was also obtained from alternate spraying of Biopesticide- Spinosad and Bioneem (Azadiractin 3EC) treated plot. So, alternate spraying of Biopesticide-Spinosad and Bioneem (Azadiractin 3EC) may be recommended for effective management of thrips in seed onion production.

Keywords: Thrips, Management, Seed yield, Onion

Location: Experimental farm of Spices Research Centre, BARI, Shibganj, Bogra

Start Date: 22-11-2013

End Date: 08-04-2014

Program Area: Pest Management

Commodity: Onion

Objectives:

To asses the efficacy of bio-rational and synthetic insecticides against thrips infestation to enhance seed yield of onion.

Methodology:

The experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogra during Rabi season of 2013-14. The experimental plot was prepared with five ploughings and cross ploughings followed by laddering to break the clods as well as level the soil. The weeds and stubbles of previous crops were collected and removed from the soil. The unit plot size was 3 m x 2.5 m. Treatments were assigned in a randomized complete block design (RCBD) with three replications. BARI Onion 1 was used as test crop for this trial. Onion bulb was planted on 25 November 2013, maintaining 20 cm x 15 cm spacing. The treatments were T₁= White sticky trap @ 40 trap/ha; T₂= Biopesticide-Bioneem (Azadiractin 3EC) @ 2 ml/litre of water; T₃= Biopesticide-Bioneem (Azadiractin 3EC) @ 2ml/litre of water + White sticky trap @ 40 trap/ha; T₄= Thiamethoxam (Actara 25WG) @ 0.2g/litre of water + White sticky trap@ 40 trap/ha; T₅= Alternate spraying of Biopesticide-Spinosad (Tracer 45SC) @ 0.4ml/litre of water and Bioneem (Azadiractin 3EC) @ 2ml/litre of water and T₆= Untreated control. In addition to 5t/ha of cow dung, the crop was fertilized with N₁₁₅P₅₅K₇₅S₂₀Zn₄B₁₅Mo₁ kg/ha. The entire amount of cow dung P, S, B, Zn, Mo, ^¼ N and ^¼ K were applied during land preparation. The rest N was applied in three equal splits at 30, and 50 and 70 days after planting (DAP). The rest K was applied in three equal splits at 30, 50 and 70 DAP. The insecticides and biopesticides were sprayed three times at 10 days interval. To control purple blotch disease, the crop was sprayed with `Rovral' @ 2g/L of water at 30, 40 and 55 DAP. The crop was harvested on 8 April 2014. To enhance pollination, sprays were done at afternoon. Thrips population was counted at 10 days interval starting from the first appearance of infestation. The first spray was applied when the thrips population was observed at economic threshold level (6-10 thrips per plant. Number of thrips (both nymphs and adults) was recorded at three days after treatment application from 20 randomly selected plants and 10 umbels in each plot by keeping a white paper below the plants and umbels, and then shaking both of them with fingers. All recommended agronomic practices were followed to raise the crops. Data on crop yield was also recorded immediately after harvest. The recorded data were analyzed and mean values were adjusted and separated by Duncan’s Multiple Range Test (DMRT). Percent thrips population reduction over untreated control was calculated using the formula.

Source of Information: Int. J. Expt. Agric. 4(3):30-33, (2014)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Alternate spraying of Biopesticide-Spinosad and Bioneem showed better performance against thrips control in onion with higher seed yield (383.3 kg/ha) and marginal benefit-cost ratio (9.55). So, alternate spraying of Biopesticide-Spinosad and Bioneem (Azadiractin 3EC) may be recommended for effective management of thrips in seed onion production.

Knowledge Management: Journal