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Varietal Preference of Okra Jassid, Amrasca Devastans (dist.) Under Field Condition of Bangladesh

M. N. Sultana
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M. M. Uddin
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M. Ahmad
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

S. M. Adnan
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted in the Field Laboratory, Department of Entomology, (BAU), Mymensingh on the varietal preference of okra jassid, Amrasca devastans (Dist.) using 14 okra varieties viz. F₁ Tamanna, Hybrid Okra Gunyon, Okra F₁ Green Soft, OK 285, Okra F1 Green Star 33, F₁ Hybrid Fresh Power, F₁ Hybrid Sarosh 3, Hybrid Okra (MDR), Okra Nabil, BARI-1 (Samrat), Hybrid Chamak and Local variety during March to June 2014. The results indicated that host preference of jassid differed significantly among the 14 varieties tested. Three varieties viz. Hybrid Chamak, Arka Anamika and Kolatia were the least preferred by jassid. Five varieties viz. Okra Nabil, Hybrid Okra (MDR), F₁ Hybrid Fresh Power, Local variety, and OK 285 were comparatively highly preferred and rest of the six varieties viz. Okra F₁ Green Star 33, BARI-1 (Samrat), F₁ Tamanna, F₁ Hybrid Sarosh 3, Hybrid Okra Gunyon, and Okra F₁ Green Soft were moderately preferred by jassid. This variation of preference of okra jassid might be due to different morphological and physiological characters of selected varieties. It could be concluded that comparatively resistant varieties selected from the present study might be incorporated to develop of IPM package for jassid.

Keywords: Variety, Preference, Okra, Jassid

Location: Entomology Field Laboratory of BAU, Mymensingh

Start Date: 00-03-2014

End Date: 00-06-2014

Program Area: Pest Management

Commodity: Insects

Objectives:

To develop a suitable management strategy it is necessary to know the varietal preference of this pest. Considering the above points the present study has been conducted to screen out resistant variety(s) for okra jassid.

Methodology:

The experiment on the varietal preference of okra jassid, Amrsaca devastans was conducted in Entomology Field Laboratory of BAU, Mymensingh during March to June, 2014 to find out resistant varieties to jassid, Amrasca devastans using 14 varieties of okra (Okra varieties viz. Arka Anamika, F₁ Tamanna, Hybrid Okra Gunyon, Okra F₁Green Soft, Kolatia, OK 285, Okra F₁ Green Star 33, F₁ Hybrid Fresh Power, F₁ Hybrid Sarosh 3, Hybrid Okra MDR, Okra Nabil, BARI 1 (Samrat), Hybrid Chamak, and Local variety). At first, soil of the experimental field was prepared thoroughly by ploughing and cross ploughing followed by laddering to have a good tilth. The plots were raised by 10 cm from the soil surface keeping the drain around the plots. Recommended doses of manure (Cowdung @ 15 t/ha) and fertilizers (urea 150 Kg/ha, TSP 100 Kg/ha, MoP 150 KG/ha) were used (Rashid, 1999). Full amount of Cowdung and TSP, half of MoP were applied basally one week before sowing and well mixed with soil. The rest half of MoP and urea were applied in three equal installments as top dressing at 25 days after sowing (DAS), flower initiation stage and fruit initiation stage. Seeds were collected from Dhaka and Mymensingh local market. Seeds were sown on 1st week of March in the field. Seeds of okra cultivars were soaked in water for 12 hours and sown directly in the pits. Three seeds were sown in each pit maintaining line to line distance and plant to plant distance 40 cm. Seeds were covered with loose soil. The plots were watered just after sowing. Gap filling was done by transplanting seedlings from the stock. Intercultural operations such as irrigation, weeding, thinning, staking and other operations were done throughout the cropping season for proper growth and development of the plants. Supplementary irrigation was applied at an interval of 23 days. Weeding was done as and when necessary. These plants were used for the varietal preference experiment. The experiment was designed in RCBD with three replications of each treatment in the field. The whole experimental field was 18 m length and 16 m breadth which was divided into 3 equal blocks and each block was divided into fourteen plots. Block to block distance was 0.5 m. Every unit plot had 4 rows with 5 plants at each row. The total number of plants per plot was 20.The varietal preference of okra jassid at different stages of the plants was determined by counting the number of total egg, nymph, adult, and curl leaf at vegetative stage. Data were collected at every 7 days interval. All the data were analyzed statistically following the computer package MSTAT-C programming. The mean differences among the treatments were adjudged as per test with Duncan's Multiple Range Test (DMRT) and Least Significant Difference (LSD) when necessary.

Source of Information: J Bangladesh Agril Univ 15(2): 227–233, 2017

Article Link (Online Journal): doi: 10.3329/jbau.v15i2.35067

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results it was found that the mean number of eggs, nymphs, adults and curled leaf per plant varied significantly among the 14 varieties tested. Based on these parameters the least preferred variety by the jassid was Hybrid Chamak followed by Kolatia and Arka Anamika. The most preferred variety was Hybrid Okra (MDR), Local variety, F₁ Hybrid Fresh Power and OK 285. Therefore, Hybrid Chamak, Kolatia and Arka Anamika might be used as resistant variety for ecofriendly management of jassid in the field.

Knowledge Management: Journal