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Effect of Different Transplanting Dates for the Management of Thrips in Onion

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

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

M. J. Khatun
Lecturer
(Biology), Haji Osman Goni College, Dariapur, Gaibandha, Bangladesh

M. M. Hossain
Senior scientific officer
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. S. Alam
Principal Scientific Officer
TCRSC, BARI, Seujgari, Bogra, Bangladesh

Abstract/ Executive Summary:

The field experiment was conducted at SRC, Bogra during Rabi season of 2013-14 to assess the effect of varying transplanting dates on thrips populations and onion bulb yield. The treatments were T₁= 20 November (1st transplanting); T₂= 05 December (2^nd transplanting); T₃= 20 December (3^rd transplanting); T₄= 05 January (4^th transplanting) and T₅= 20 January (5^th transplanting). Transplanting was done at 15 days interval from November to January. Results showed that early transplanting in 20 November and 5 December had fewer thrips (7.81 thrips/plant and 10.76 thrips/plant) than the subsequent ones. November transplant was free of thrips up to 9 weeks after transplanting (WAT), December transplanting up to 8 WAT and January transplanting up to 4 WAT. Onion bulb yields were also found to differ in descending order as follows: 20 November (21.85 t/ha)> 05 December (18.98 t/ha)> 20 December (18.50 t/ha)> 05 January (7.26 t/ha)> 20 January (5.28 t/ha).

Keywords: Transplanting date, Management, Thrips, Yield, Onion

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

Start Date: 20-11-2013

End Date: 02-05-2014

Program Area: Pest Management

Commodity: Insects

Objectives:

To assess the effect of varying transplanting dates on thrips populations and onion bulb yield.

Methodology:

The study was conducted at Spices Research Centre, 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 × 1.2 m and spacing was 15 cm × 10 cm. The treatments were T₁= 20 November (1st transplanting); T₂= 05 December (2^nd transplanting); T₃= 20 December (3^rd transplanting); T₄= 05 January (4^th transplanting) and T₅= 20 January (5^th transplanting). Treatments were assigned in a randomized complete block design (RCBD) with three replications. BARI Onion 4 was used as test crop for this trial. The crop was planted as per date mentioned in the treatments. In addition to 5 t/ha of cow dung, the crop was fertilized with N₁₂₀P₄₀K₇₅S₃₀ kg/ha. The entire amount of cow dung TSP and^½ of N and K were applied during final land preparation. The rest N and K was applied in two equal splits as top dress at 25 and 50 days after transplanting (DAP). Three weeding were done at 25, 50 and 75 DAP. To control purple blotch disease, the crop was sprayed three times with Rovral 50 WP @ 2g/l of water at 35, 45 and 55 DAP. Three irrigation were done at 10-20 days interval during vegetative growth stage. The whole experimental plot was kept free from spraying of any insecticides. Depending on the maturity, the crop was harvested through 18 March to 2 May 2014. Thrips population was counted at 7 days interval starting from the first appearance of infestation. Number of thrips (both nymphs and adults) was recorded from 20 randomly selected plants in each plot by keeping a white paper below the plant and then shaking the plants with finger. Another data were recorded on plant height, bulb weight and bulb yield. The recorded data were analyzed and mean values were adjusted and separated by DMRT.

Source of Information: Int. J. Expt. Agric. 4(4):9-13, (2014)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Early transplanting (20 November to 20 December) resulted lower thrips population and higher bulb yield of onion.

Knowledge Management: Journal