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Effect of Different Application Methods of Imidacloprid on Abundance and Management of Jassid in Okra

MY Zaman
Department of Entomology, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207

SMM Rahman
Department of Entomology, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207

MA Latif
Department of Entomology, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207

M Ali
Department of Entomology, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207

Abstract/ Executive Summary:

A field study was carried out in the farm of Sher-e-Bangla Agricultural University (SAU) during March to June, 2012 to investigate the effect of different application methods of imidacloprid on abundance and management of jassid in okra. The population of jassid in control plot was gradually increased with the age of the crop and the peak population was found on last week of May and it was remained constant after that. The lowest number of jassid (14.66/plant) was found in T₂ (seed treatment by Gauchu 70WS + foliar spray with Admire 200SL), which reduced 77.71% population of jassid over control. Plant height, number of fruits/plot and yield per plot were significantly increased under different treatments. The highest plant height (181.80 cm), number of fruits/plot (652) and yield (13.84 t/ha) were observed in T₂ treated plot which was found to be the best treatment in this study. The output of all tested parameters in T₂, T₄ (seed treatment by Gauchu 70WS + band application of Gauchu 70WS) and T₅ (pre-plant injection by Gauchu 70WS at a depth of 4 cm below the seed line + foliar spray with Admire 200SL) treated plots were statistically dissimilar with each other. Combination of different application methods yielded better result than that of the single method alone. Taking into account the jassid population, plant growth, number of fruits and fruit yield, seed treatment by Gauchu 70WS associated with foliar spray with Admire 200SL (T₂) was the most effective application method

Keywords: Imidacloprid, Application method, Abundance, Jassid, Okra

Location: Sher-e-Bangla Agricultural University (SAU), Dhaka

Start Date: 00-03-2012

End Date: 00-06-2012

Program Area: Pest Management

Commodity: Okra

Objectives:

To investigate and compare the different application methods of imidacloprid on the incidence of abundance of okra jassid and their efficacy for the management of this pest.

Methodology:

The field experiment was conducted at the experimental farm of Sher-e-Bangla Agricultural University (SAU), Dhaka during March to June, 2012 to assess the various application methods of imidacloprid and/ or their combinations on the pest incidence and management. The experiment was laid out in a randomized complete block design (RCBD) with four replications having six treatments including an untreated check. Each plot measured 3m x 4.2 m with 1 m of inter-plot and inter-block distance. The okra (cv. BARI Derosh 1) seeds were sown on 23 March, 2009 keeping a space of 60 cm x 50 cm @ 3 seeds pit^-1 and 24 pits plot^-1. All the normal agronomic practices except the insecticide applications were carried out throughout the growing season of the crop in all treatments for maintaining healthy crop growth. The treatments were: T₁ = seed treatment by Gauchu 70WS @ 5.0 g/kg seed; T₂ = seed treatment by Gauchu 70WS @ 5.0 g/kg seed + foliar spray with Admire 200SL @ 0.5 ml/L of water; T₃ = band application of Gauchu 70WS @ 2.0 g/L of water; T₄ = seed treatment by Gauchu 70WS @ 5.0 g/kg seed + band application of Gauchu 70WS @ 2 g/L of water; T₅ = pre-plant injection by Gauchu 70WS at a depth of 4.0 cm below the seed line @ 2.0 g/L of water + foliar spray with Admire 200SL @ 0.5 ml/l of water; and T₆ = untreated check. For seed treatment, okra seeds were soaked in Gauchu 70WS mixed-water for 2 hours prior to sowing. In case of band application of Gauchu 70 WS, a circular band was made around each pit. First foliar spray of Admire 200 SL was done on 15 days after germination of seeds and continued throughout the cropping season at 7 days interval. Spraying was done in the afternoon with high volume knapsack sprayer and a through coverage of leaf area, tender shoots and fruits was ensured. Data were collected on jassid population, plant height, number of fruit, fruit weight and yield of okra. The population of jassid was counted at 7 days interval starting from 14 days after germination when first incidence of jassid was noticed. Jassid nymphs as well as adults population were observed from the top five leaves of the 12 randomly selected tagged plants in each of the replicate. Both jassid nymphs and adults were counted visually on lower surface of the leaves in the early morning (7 to 9 AM), when the jassid were found inactive. Mean population per plant was calculated from these recorded data. The height of selected twelve plants was measured at 15, 30, 45, 60, and 75 days after germination. Fruits were harvested at every alternate date and a total of 20 harvests were done throughout the fruiting period (May-June). The number and weight of fruits per plot were recorded after each harvest. Yield of okra per hectare for each treatment was calculated in tons from cumulative fruit production in a plot. The data thus recorded on different parameters were subjected to analysis of variance to record the level of significance for variation and the mean values were compared by using Duncan’s Multiple Range Test (DMRT) (Gomez and Gomez, 1984) through MSTAT-C software.

Source of Information: Eco-friendly Agril. J. 9(11): 66-71, 2016 (November)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded from the present research findings that jassid infestation varied with ages of okra plant and hampered the growth severely at initial stage of plant. It should be advised to dress seed of okra by Gauchu 70WS in combination with foliar spray of Admire 200SL at weekly interval for controlling jassid when the population is very high. Treatment T₅ and T₄ can be used as second line of defense to combat this pest. However, treatment T₃ and T₁ was also effective to some extent against jassid over control. This investigation may potentially contribute towards devising an IPM strategy for jassid on okra.

Knowledge Management: Journal