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Varietal Preference of Okra Shoot and Fruit Borer, Earias Vittella (fab.) Under Field Condition in Bangladesh

Rahman MA
Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Uddin MM
Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Haque MA
Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Rahman MM
Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out in the Entomology Field Laboratory of Bangladesh Agricultural University during February to May-2014 to investigate the varietal preference of okra shoot and fruit borer, Earias vittella among different okra varieties. Seven okra varieties viz., Taj Vendhi, BARI Dharos1, Arka Anamika, Green Finger, Green Soft, OK-285 and Nabik were taken for varietal preference. Among the seven varieties, Taj Vendhi was the most preferable variety as the highest average shoot and fruit infestation (about 26%, and 24% respectively) were recorded. On the contrary, Arka Anamika was found least preferable variety with lowest shoot and fruit infestations, 10% and 11% respectively. Moderately preferred varieties were OK-285 followed by Green Soft and Green Finger. Preference rank for okra shoot and fruit borer among seven okra varieties was Taj Vendhi> OK-285 > Green Soft > Green Finger >BARI Dharos-1 >Nabik>Arka Anamika. Therefore, cultivation of Arka Anamika will be the best choice to decrease pest problem for the better production of okra.

Keywords: Okra, Okra shoot and fruit borer, Earias vittella, Variety, Preference

Location: Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-02-2014

End Date: 00-05-2014

Program Area: Pest Management

Commodity: Okra, Borer

Objectives:

Knowledge on varietal preference of okra shoot and fruit borer can play a significant role in the successful okra production and its management. Unfortunately, very limited efforts were given in this regards. Considering the above situation, the present research was conducted to screen out the resistant okra variety which might be an important tool for the management of this pest.

Methodology:

The experiment was carried out in the Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh-2202, during February to May, 2014 to investigate the varietal preference of okra shoot and fruit borer, Earias vittella among seven okra varieties. Experimental field was prepared thoroughly by ploughing and cross ploughing followed by laddering and weeding for growing okra plants. Recommended doses of fertilizers were applied during final land preparation. Seeds of seven different okra varieties viz. Taj Vendhi, BARI Dharos-1, Arka Anamika, Green Finger, Green Soft, OK-285 and Nabik were collected from the seed dealer of Mymensingh town. Seeds were soaked in water overnight and sown directly in the pits @3 seeds per pit. Pits were prepared maintaining line to line distance 50 cm and pit to pit distance 40 cm. The experiment was laid out in a Randomized Complete Block Design (RCBD) with 3 replications in the field. The whole experimental field was 15 m length and 7.5 m breadth, which was divided into 3 equal blocks and each block was divided into eight plots. The unit plot size was 180 cm x 170 cm. Each of the unit plots was separated by 45 cm and block to block distance was 60 cm. Every unit plot had 3 rows with 4 pits at each row. Firstly three to four seeds were sown per pit and finally single plant was allowed to grow per pit uprooting the rest of the seedlings when they attained at three inches height. Therefore, total number of plants per plot was 12.

The varietal preference of okra shoot and fruit borer at different stages of the plants was determined by counting the number of total shoots, infested shoots, total fruits and infested fruits for each experimental plot. The extent of damage both on shoot and fruit of different varieties were calculated and expressed in percentage (Rahman et al., 2012). Data were collected at every 7 days interval started at 50 days after sowing (DAS) and continued to 78 DAS. Percent shoot and fruit infestations were calculated using following formulae;

% Shoot infestation = Number of infested shoot / Total number of shoot x 100

% Fruit infestation = Number of infested fruit / Total number of fruit x 100

All the data were analyzed statistically by the computer package MSTAT-C program. The mean differences among the infestations were separated with Duncan's Multiple Range Test (DMRT) at 5% level of probability.

Source of Information: Acad. Res. J. Agric. Sci. Res. Vol. 3(1), pp. 8-12, January 2015 (Academic Research Journal of Agricultural Science and Research)

Article Link (Online Journal): DOI: 10.14662/ARJASR2014.036

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present findings are also in conformity with those of Memon et al. (2004) and Aziz (2010)who reported that Green polo and Arka Anamika as the least susceptible varieties and the Desi variety was the most preferable variety by okra shoot and fruit borer. Considering both shoot and fruit infestation it could be concluded that, among the seven tested varieties TajVendhi was highly susceptible to okra shoot and fruit borer and Arka Anamika was resistant against OSFB infestation.

Knowledge Management: Journal