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Evaluation of Garlic Genotypes Against Thrips

M. M. HOSSAIN
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

K. M. Khalequzzaman
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. A. Wadud
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. B. Sarker
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

R. N. Ahmed
UAO
DAE, Atghoria, Pabna, Bangladesh

Abstract/ Executive Summary:

The field experiment was conducted at SRC, Bogra during Rabi season of 2013-14 to test the performance of garlic genotypes against thrips. Fifteen different garlic genotypes (GC001, GC005, GC0012, GC0013, GC0017, GC0018, GC0024, GC0027, GC0028, GC0029, GC0030, GC0031, GC0034, GC0035 and GC0036) along with BARI Garlic 1 and 2 were evaluated against thrips. Out of fifteen genotypes, GCO34 recording less than 8.29 thrips per plant and higher bulb yield (9.78 t/ha) was characterized as highly resistant. Genotypes GC0013, GC0028 and GC0030 recorded higher thrips population of more than 13.41 thrips per plant and lower bulb yield (4.07, 4.52 and 2.68 t/ha, respectively) were grouped into highly susceptible.

Keywords: Evaluation, Garlic genotypes, Thrips and Yield

Location: Spices Research Centre, Shibganj, BARI, Bogra,

Start Date: 00-11-2013

End Date: 00-04-2014

Program Area: Variety and Species

Commodity: Garlic, Insects

Objectives:

Objective of the study was to screen out different resistant/tolerant genotypes or cultivars of garlic against thrips

Methodology:

The study was conducted at Spices Research Centre, Shibganj, Bogra during Rabi season of 2013-14. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Fifteen different garlic genotypes (GC001, GC005, GC0012, GC0013, GC0017, GC0018, GC0024, GC0027, GC0028, GC0029, GC0030, GC0031, GC0034, GC0035 and GC0036) along with BARI Garlic 1 and 2 were evaluated against thrips. The unit plot size was 3 m x 1.2 m. The spacing was 10 cm x 10 cm. In addition, 5 t/ha of cow dung, N₁₀₀ P₅₄ K₁₆₆ S₂₀ kg/ha were applied in the experimental field. The entire quantity of cowdung, P, K, S and ½ of N was applied during land preparation. The rest of N was applied in to equal splits at 25 and 50 days after planting (DAP) (Anonymous 2010). The cloves were planted on November 15, 2013. Weeding was done at 25, 50 and 75 DAP. To control purple blotch disease the crop was sprayed three times with Rovral 50WP@2 g/litre of water at 35, 45 and 55 DAP. Three irrigations were done at 10-20 days interval during vegetative growth stage. Irrigation was stopped before 20 days of crop maturity. The crop was harvested on March 24, 2014. The whole experimental plot was kept free from spraying of any insecticides. Thrips population was counted at seven days interval starting from the first appearance of infestation. Number of thrips (both nymphs and adults) was recorded from 20 randomly selected plants in each plot by keeping a white paper below the plant and then shaking the plants with finger. The tested genotypes were also grouped into four categories of resistance viz., highly resistant, resistant, susceptible and highly susceptible based on number of thrips per plant. For the grouping purpose, mean value of individual genotype was compared with mean value of all genotypes and standard deviation (sd). The retransformed data were used for computation of mean value of individual genotype, mean value of all genotypes and sd in case of this parameter. Data on yield were also recorded immediately after crop harvest. The recorded data were analyzed and mean values were adjusted and separated by DMRT.

Source of Information: Int. J. Expt. Agric. 4(4):1-4, (2014)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Genotype GC0034 recorded the lowest thrips population and higher bulb yield was characterized as highly resistant. Genotypes GC0013, GC0028 and GC0030 recorded higher thrips population and lower bulb yield were grouped into highly susceptible.

Knowledge Management: Journal