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Varietal Preference of Lipaphis Erysimi (kaltenbach) on Three Species of Brassica

Pankoj Kumar Sarker
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Md Matiur Rahman
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Bidhan Chandra Das
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Context: Lipaphis erysimi have different type of preference to settle on different varieties of mustard. Pest preferential movement is important for ecofriendly pest control. Objectives: The aim of this study was to determine the L. erysimi resistance varieties of mustard to get more yields by lower cost and avoid most aphid infesting varieties for higher cost Materials and Methods: Two criteria were used to determine the varietal preference of L. erysimi, viz. (i) dispersal of aphids by cutting the base of host plants and enforce to settle on different varieties of three species of Brassica under free choice conditions, and (ii) suitability of those varieties based on the aphid infestation in the field crop condition at same season. Results: The preferential movement of L. erysimi on ten varieties of Brassica showed significant differences (P<0.01). The variety, Bari sharisa-6 showed highest (90.00 ± 7.21) aphid settlement followed by the variety, Rai-5 (89.00 ± 5.69). The variety, Bari sharisa-10 showed lowest (10.00 ± 0.58) aphid settlement followed by the variety, Bari sharisa-11 (19.00 ± 3.61). Naturally infested aphid population on first sowing date was recorded highest (2.1 ± 0.79) on the variety Bari Sarisha-8, followed by Bari Sarisha-6 (1.93 ± 0.88). The lowest (0.19 ± 0.09) number of aphids recorded on Bari Sarisha-12. In second sowing date, Bari Sarisha-7 showed highest (19.5 ± 6.51) aphid population, followed by Bari Sarisha-8 (15.42 ± 5.72). The lowest (1.2 ± 0.38) aphid population found on the variety, Bari Sarisha-11. In third sowing date, highest (14.69 ± 5.69) number of aphids was recorded on the variety, Bari Sarisha-6, followed by the variety, Sonali-75 (14.48±4.74). Lowest number (6.06 ± 2.30) of aphids was found on the variety, Bari Sarisha-12. In the fourth sowing date, highest (15.54 ± 5.72) aphid population recorded on the variety, Bari Sarisha-8, followed by Bari Sarisha-7 (14.39 ± 5.70); and the lowest (4.41 ± 1.75) number of aphids recorded on the variety, Bari Sarisha-9.

Keywords: Lipaphis erysimi, Varietal preference, Brassica, Sarisha, Rai.

Location: Department of Zoology, University of Rajshahi, Rajshahi

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Mustard

Objectives:

The aim of this study was to determine the L. erysimi resistance varieties of mustard to get more yields by lower cost and avoid most aphid infesting varieties for higher cost

Methodology:

Two criteria were used to determine the varietal preference of L. erysimi, viz. (i) dispersal of aphids by cutting the base of host plants and enforced to settle on different varieties of mustard and rai under free choice conditions, and (ii) suitability of those mustard and rai varieties based on the aphid infestation in the field crop condition at same season (Elmali 1998). Ten varieties of mustard and rai of three species, viz. Brassica campestris (Bari Sarisha-06, Bari Sarisha-09, Bari Sarisha-12, Tory-07 and Sonaly-75), Brassica juncea (Bari Sarisha-10, Bari Sarisha-11, Rai-05) and Brassica napus (Bari Sarisha-07, Bari Sarisha-08) were selected for both the experiments. In order to study the settlement of enforced mustard aphids, ten varieties of Brassica seeds were sown in the tubs (33 tubs; 18 cm height and 26 cm diameter) which was prepared by soil and bio-fertilizer. Only one plant was allowed to grow up in each tub. The tubs were left in the open field within nets to protect them from aphids. Six tubs with the excess plants were kept open for natural infestation of L. erysimi. Thereafter, those plants were checked regularly to observe the level of infestation. First experiment (dispersal of aphids by cutting the base of host plants and enforce to settlement on different varieties of mustard and rai under free choice conditions) was started after attaining a thick infestation (both apterae and alatae) on the experimental plants, which were not kept under the net. Each of the above ten varieties was arranged in a circle of two feet radius with equal spacing at random with three replications. One tub with thick infestation of L. erysimi with both alatae and apterous females were placed in the centre of the circle and cut at the base. Thereafter, observations were made on the movement of aphids from these cut plants to the nearest fresh and healthy plants of ten varieties. Aphids those were settled on different varieties of plants were counted at two days interval. Counting was continued up to 8th days. This experiment was replicated three times and conducted in the fields of Rajshahi University Campus during 2005-2006 seasons. Second experiment was on the suitability of the experimental varieties based on the aphid infestation in the field crop condition at same season. The alatae of L. erysimi comes naturally in the field and settle its preferred varieties and started colony formation.

Source of Information: J. bio-sci. 17: 145-148, 2009 ISSN 1023-8654

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the present experiment, the varieties, Bari Sarisha-6, Bari Sarisha-7, Bari Sarisha-8 and Rai-5 can be identified as most susceptible for the significant attack of the aphid pest, L. erysimi and the varieties, Bari Sarisha-10, Bari Sarisha-11 and Bari Sarisha-12 as the least susceptible. The results would be helpful to select the proper varieties of mustard and rai crops in Bangladesh.

Knowledge Management: Journal