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Screening of Rapeseed and Mustard Entries Against Aphid Under Field Condition

Rabiul Islam*
Oilseed Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh

Most. Arifunnahar
Plant Pathology Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh

Mohammad Sarifuddin Bhuiyan
On Farm Research Division, Bangladesh Agricultural Research Institute, Bandarban, Bangladesh

Abstract/ Executive Summary:

Cultivation of resistant or tolerant varieties is the easiest way to protect mustard crop from insect pests. Varietal screening for aphid resistance and stability of seed yield under aphid-infested and protected environment would help in identifying the tolerant varieties for aphid damage. The present study was conducted in the field of the Oilseed Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, during Rabi season of 2014-2015. Twenty six entries of rapeseed and mustard were evaluated against mustard aphid (Lipaphis erysimi Kalt.). In three entries of Brassica rapa, namely BC-05115, BC-9921, BC-05117 (25.7-30.4 aphids/plant) and of Brassica juncea BJDH01, BJDH-12 (6.6 -7.0 aphids/plant) comparatively less aphid infestation were found than the check and other entries. From the result of this experiment, it was observed that Brassica rapa entries were damaged by the highest number of aphid while Brassica juncea had the lowest aphid infestation.

Keywords: Lipaphis erysimi Kalt., Brassica rapa, Brassica juncea, Germplasm Seasonal occurrence

Location: In the field of the Oilseed Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur,

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Mustard

Objectives:

The experiment was carried out to evaluate the performance of some mustard varieties/ entries against aphids.

Methodology:

Study area The experiment was conducted in the field of the Oilseed Research Centre, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, during Rabi season of 2014-15. Plant materials Twenty six entries of rapeseed and mustard were used in this experiment. Twelve entries of Brassica rapa and 14 entries of Brassica juncea were evaluated against mustard aphid. Two cultivars mustard variety namely BARI Sarisha -14 and Tori - 7 were used as a check for Brassica rapa while BARI Sarisha -11 and BARI Sarisha-16 were used as a check variety for Brasssica juncea group. All the check variety used here is popular among the farmers. The planting materials were collected from Genetics and Breeding section of Oilseed Research Centre of BARI. Experimental field and implementation of crop The mustard entries were sown in November 20, 2014. To ensure good germination, ploughing of the experimental field was done with the help of soil turning plough followed by two cross ploughing with harrow. Plot size was in 2 m × 80 cm and Randomized Complete Block design with three replications. The seeds were sown in lines. Fertilizers were applied as per recommended by Oilseed Research Centre, BARI. Other intercultural operations like thinning, weeding, irrigation and top dressing were done as per the recommendation of Oilseed Research Centre. No insecticides were applied in the cropping period. Aphid populations were counted (in situ) from 10 randomly preselected plants in each replicated plots on 10 cm twigs of the inflorescence at 7 days intervals. The meteorological parameters viz. temperature, relative humidity and rainfall were also recorded. The mean values of previous 7 days data of the above mentioned parameters were computed for 7th days of observations.

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Achievement/Findings:

The findings of these studies indicated that the use of aphid resistant varieties have number of advantages, as the resistance is inherent in the plant itself with no extra cost involved in the control measures. Therefore, the uses of resistant varieties are the most effective and important weapon for controlling aphids without insecticides application and thereby play an important role in Integrated Pest Management (IPM) Programme. Hence, the farmer will be suggested to grow aforesaid resistant or less susceptible and high yielding varieties. This will help them to ensure higher yield of mustard and at the same, the risk of health hazard and environment pollution may be avoided. So, the selected entries of Brassica rapa, BC-05115, BC9921, BC05117 and two entries of Brassica juncea BJDH-01, BJDH-12 can be used as breeding program for developing suitable aphid tolerant mustard variety(s).

Knowledge Management: Journal