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Incidence and Damage Estimation of Brinjal Shoot and Fruit Borer in Five Different Brinjal Varieties

S. Ara
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

N. Nahar
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

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

Abstract/ Executive Summary:

An experiment was conducted to observe the incidence of brinjal shoot and fruit borer, Leucinodes orbonalis Guen. and to estimate their damages in five different brinjal varieties (viz. Laffa, Dohazari, Uttara, Islampuri and Amjuri) in the Plant Pathology Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from January to March, 2007. Peak period of brinjal shoot and fruit borer infestation was observed in March in all the five varieties. Maximum number of population (5.0 per plant) was recorded in Amjuri variety in first week of March whereas minimum number of population (0.33 per plant) was observed in Dohazari variety in the third week of March. No infestation was found from 3rd week of January to 3rd week of February in all the five tested brinjal varieties. Brinjal shoot and fruit borer caused damages to shoots and fruits of brinjal plant and it was found that all the tested brinjal varieties are susceptible to the borer. In case of all tested varieties, mean number of damaged shoots and fruits per plant differed significantly at different sampling times. Among the five varieties Amjuri was heavily infested with the highest infestation of shoot and fruit. In this variety, mean number of damaged fruit per plant was 2.11, 1.67 and 1.87 at first, second and third week of March, respectively. In Islampuri variety, shoot infestation was found only in the 3rd week of March.

Keywords: Brinjal shoot and fruit borer, Damage estimation, Incidence, Varieties

Location: Plant Pathology Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 00-01-2007

End Date: 00-03-2007

Program Area: Pest Management

Commodity: Brinjal

Objectives:

To determine the incidence and extent of damage of brinjal shoot and fruit borer in five brinjal varieties.

Methodology:

An investigation was made in Plant Pathology Field Laboratory, Bangladesh Agricultural University, Mymensingh, to observe the incidence and damages of brinjal shoot and fruit borer in five brinjal varieties viz. Laffa, Islampuri, Uttara, Dohazari and Amjuri during the period from January to March 2007. The experiment was laid out in Randomized Complete Block Design. Required quantity of seeds of different varieties were sown separately in well prepared seed bed to raise seedlings. The experimental plots were prepared with proper ploughing and laddering. Cowdung and fertilizers were applied at the rate of 15 tons cowdung and 250, 150, 125 kg of Urea, TSP and MP, respectively per hectare. Intercultural operations were performed as and when necessary. No chemical control measures were taken against insect pests. For estimation of brinjal shoot and fruit borer population, 5 plots of 3 m² size for each variety was first randomly selected from the brinjal field. The sampling was started from 3rd week of January and continued up to 3rd week of March at weekly interval. Five plants in each plot were observed randomly. Infested shoots and fruits were collected. Collected shoots and fruits were cut open to count the caterpillars and data were recorded. The monthly meteorological data related to temperature, humidity and rainfall were collected from the weather yard of Bangladesh Agricultural University. During the study period the temperature ranged from 17.0 to 34.50°C, relative humidity 64 to 98% and rainfall 0 to 20.0 mm. The collected data were statistically analyzed in accordance with Randomized Complete Block Design (RCBD) and mean differences were adjusted by Least Significance Difference (LSD) test under Microsoft Statistical Programme in a computer.

Source of Information: Progress. Agric. 18(2) : 75-80, 2007 ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In case of all tested varieties, mean number of damaged shoots and fruits per plant differed significantly at different sampling times. These differences might be due to the cultivar specific traits or variation of morphological structure of leaf and fruits. It is evident that plant with dense foliage become more susceptible to shoot and fruit borer attack. All the five varieties tested, the level of infestation increased gradually from February to March. This increasing trend might be due to availability of new, fresh shoots and fruits. Maximum number of population (5.0 per plant) was recorded in Amjuri variety in first week of March whereas minimum number of population (0.33 per plant) was observed in Dohazari variety in the third week of March. No infestation was found from 3rd week of January to 3rd week of February in all the five tested brinjal varieties. Brinjal shoot and fruit borer caused damages to shoots and fruits of brinjal plant and it was found that all the tested brinjal varieties are susceptible to the borer. In case of all tested varieties, mean number of damaged shoots and fruits per plant differed significantly at different sampling times. Among the five varieties Amjuri was heavily infested with the highest infestation of shoot and fruit. In this variety, mean number of damaged fruit per plant was 2.11, 1.67 and 1.87 at first, second and third week of March, respectively. In Islampuri variety, shoot infestation was found only in the 3rd week of March.

Knowledge Management: Journal