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Biology of the Angoumois Grain Moth, Sitotroga Cerealella (oliver) on Stored Rice Grain in Laboratory Condition

T. AKTER
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

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

M.S. I. BHUIYAN
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted in the laboratory of the Department of Entomology, Shere- Bangla Agricultural University, Dhaka during the period from May 2009 to April 2010 to study the biology of the Angoumois grain moth, Sitotroga cerealella (Oliver) in Bangladesh. The ovipositional period, incubation period, larval period, pre-pupal period and pupal period of Angoumois grain moth were 3.67 days, 5.5 days, 25.2 days, 3.0 days and 5.0 days, respectively; male and female longevity of moth were 8.0 and10 days, respectively. The lengths of all five larval instars were 1.0 ± 0.00, 2.0 ± 0.02, 4.0 ± 0.06, 5.0 ± 0.03 and 4.0 ± 0.06 mm, and the widths were 0.10 ± 0.0, 0.4 ± 0.0, 0.6 ± 0.01, 0.8 ± 0.02 and 1.0 ± 0.09 mm, respectively. The length and width of the pre-pupa and the pupa were 4.0 ± 0.02, 3.5 ± 0.01 mm and 1.20 ± 0.05, 1.50 ± 0.03 mm respectively. The length of male and female was 11.2 ± 0.09 and 12.07 ± 0.06 mm respectively.

Keywords: Biology, Angoumois grain moth, Sitotroga cerealella, Stored rice grain

Location: Department of Entomology, Shere-Bangla Agricultural University, Dhaka

Start Date: 00-05-2009

End Date: 00-04-2010

Program Area: Postharvest and Agro-processing

Commodity: Rice

Objectives:

1. To study the biology of the Angoumois grain moth, Sitotroga cerealella (Oliver) in Bangladesh.

Methodology:

The study was conducted in the laboratory of the Department of Entomology, Sher-e- Bangla Agricultural University, Dhaka during the period from May 2009 to April 2010. Parboiled rice variety BR-11, collected from farm store house of Sher-e-Bangla Agricultural University, was used for this investigation. Male and female adult moths were also collected from farm store house of the same University. Male and female adult moths were sorted out under a simple microscope by observing their abdominal tergites. In males, the abdomen is thinner, pointed and blackish when viewed from the ventral side whereas in females, the abdomen is bulky and long without any blackish coloration and size of the body (male is smaller than female). The comparative biology of Sitotroga cerealella was studied on rice grains in laboratory conditions by maintaining them at room temperature. The collected moths were enclosed in plastic jars (measuring 25×30 cm) for mating and oviposition. Collection of the eggs of S. cerealella: For the collection of fresh egg mass, the rearing of S. cerealella was done by using wheat grain (only for rearing purposes) as a diet in a special mass rearing chamber. From S. cerealella mass rearing chamber, thousands of adults were collected and kept them in a glass cylinder. The top of the cylinder was covered by 32 mesh net .Adults were kept in a cylinder for one day for mating and subsequent egg laying on the glass cylinder. In the consecutive days the eggs laid on the wall of the cylinder were brushed and sieved to collect fresh eggs along with body parts of moth. Then the body parts of moth were cleaned and fresh eggs were obtained. The collected eggs of S. cerealella were kept into a glass tube with labeling and stored in a refrigerator at 40C temperature to ensure continuous supply for future study. Biology of S. cerealella: The eggs of S. cerealella were laid on pieces of white paper placed on Petridish for hatching. The newly hatched larvae were transferred in Petri dishes with grains. The morphological characteristics of the larvae and pupae were studied and recorded during the period of larval and pupal development respectively. Different growth and development stages of S. cerealella, such as incubation period, larval period, pupal period and adult longevity were studied during the experimental period. The incubation period was assessed based on the time the egg was laid and the time the larva was emerged from a particular egg. Larval and pupal periods were recorded by cutting infested grains with the help of a blade and observed under the microscope. The emerging adults of S. cerealella were kept in the glass tube until death and the adult longevity was recorded. Length and width: The length and width of different stages of the insect were observed under a sterio- microscope and measured with the help of slide calipers.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 39(1): 61-67, June 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The Angoumois grain moth, Sitotroga cerealella is one of the most serious pests of stored rice (unhusked) at post harvest level. The moth develops through egg, five larval instars, pupa, pre-pupa and adult stages.

Knowledge Management: Journal