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Study on Resistance of Different Rice Varieties Against Rice Weevil, Sitophilus Oryzae (l.)

M. H. Rashid
Scientific Officer
Entomology Division, BARI, RARS, Hathazari, Chittagong

M. A. Haque
Professor
Department of Entomology , BAU, Mymensingh

M. S.Huda
Scientific Officer
Farm Division, BARI, Joydebpur, Gazipur

M. M. Rahman
Scientific Officer
Training and Communication Wing, BARI, Joydebpur, Gazipur

A. F. M. S. Ahsan
Scientific Officer
Agronomy Division, BARI, RARS, Hathazari, Chittagong, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted in the laboratory of Department of Entomology, Bangladesh Agricultural University, Mymensingh during June to October, 2004 to evaluate resistance, if any, of rice grains of 7 rice varieties viz, BR3, BR11, BR14, BR26, BRRI dhan28, BRRI dhan29 and Kalogira against rice weevil, Sitophilus oryzae (L). Resistance was tested against unhusked- unparboiled and husked- parboiled conditions of each of the varieties under controlled condition. Five pairs of adult rice weevil were confined on 500 g of paddy or rice grains. Mortality of weevil populations within 10 days of confinement was observed. Mortality of initial weevil populations, new adult emergence, development and grain weight losses were considered as indicator of resistance. Among the grain conditions, unhusked- unparboiled paddy grains of all the varieties showed some degree of resistance against rice weevil. The variety Kalogira was consistently resistant against S. oryzae in all two conditions of rice grains, while resistance reaction of unhusked- unparboiled BR11 and BR3 paddy was not maintained after husking. The most resistant and susceptible variety suffered 3.34% (Kalogira) and 10.74% (BR26) loss in unhusked- unparboiled condition and 4.34% (Kalogira) and 14.60% ( BR26) loss in husked-parboiled condition, respectively.

Keywords: Resistant rice variety, Rice weevil (Sitophilus oryzae), Storage, Weight loss

Location: Laboratory of Department of Entomology, Bangladesh Agricultural University, Mymensingh

Start Date: 00-06-2004

End Date: 00-10-2004

Program Area: Pest Management

Commodity: Insects

Objectives:

To find out varietal resistance of seven rice verities to the rice weevil.
To test resistance against unhusked-unparboiled and husked-parboiled conditions of each of the varieties.

Methodology:

An experiment was conducted in the laboratory of Department of Entomology, Bangladesh Agricultural University, Mymensingh during June to October, 2004. Resistance status of 7 rice varieties viz. BR3, BR11, BR14, BR26, BRRI dhan28, BRRI dhan29 and Kalogira against rice weevil, Sitophilus oryzae (L) was evaluated. Resistance was tested against unhusked- unparboiled and husked- parboiled conditions of each of the varieties. The study was conducted in completely randomized design with three replications at room temperature. The weevil was mass reared in three plastic containers measuring 20 x14 cm. The containers were half filled with 50 g of clean, freshly husked- parboiled rice grains of variety BR26 covered with a fine mesh nylon cloth for aeration. Male and female rice weevils were identification. Fifty gram of paddy or rice was placed in a plastic container and five pairs of adult S. oryzae were confined in each container. All the containers were closed with fine mesh nylon cloth. Mortality of initial weevil populations at 10 days after infestation was recorded. Dead and adult insects were separated from each sample and percentage mortality was calculated. After 22-25 days, new adults started emerging from these seeds. The number of emergent rice weevil at different days from each variety was recorded. When the emergence of the weevils were completed, the final weights of these seeds were taken to obtain grain weight loss for each variety. The weight losses of rice were found out by subtracting the final weight from the initial weight (50 g). The weight losses were converted into percentage. Mortality of initial weevil populations, new adult emergence, development and grain weight losses were considered as indicator of resistance.

Source of Information: Int. J. Sustain. Crop Prod. 4(1):35-40, 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among seven varieties tested in unhusked-unparboiled condition, kalogira, BR3 and BR11 showed high resistance to rice weevil and BR14, BRRI dhan 28 and BRRI dhan29 exhibited moderate resistance and BR26 were most susceptible to rice weevil. The trend was changed in case of husked-parboiled condition where almost all varieties were preferred by rice weevil except kalogira. Resistance in BR3 and BR11 appeared to be associated with rice husk. Husking did not cause resistance to kalogira indicating cause of resistance in this variety probably due to antibiosis. Rice varieties with resistance against major stored grain pests could play significant role in minimizing losses during storage. Therefore, stored grain pest resistant varieties could be developed. Resistance source of different stored grain pests need to be identified and advance breeding lines may also be screened against major stored grain pests.

Knowledge Management: Journal