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Population Fluctuation of Jassid, and Shoot and Fruit Borer of Okra

A Mohammad
Scientific officer
Entomology section, Horticulture Research Centre, Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh

SN Alam
Chief scientific officer
Entomology Division, BARI, Gazipur, Bangladesh

MRU Miah
Department of Entomology
Bangabandhu Sheikh MujiburRahman Agricultural University (BSMRAU), Gazipur, Bangladesh

MR Amin
Department of Entomology
Bangabandhu Sheikh MujiburRahman Agricultural University (BSMRAU), Gazipur, Bangladesh

RS Smriti
Department of Soil Science
BSMRAU, Gazipur, Bangladesh

Abstract/ Executive Summary:

A field study was conducted at the research field of Entomology Division, Bangladesh Agricultural Research Institute (BARI), Gazipur during April to July, 2016 to measure the population fluctuation of jassid (Amrasca biguttula), and shoot and fruit borer of okra (Eariasvittella). Results revealed that jassid was always found in okra leaf during the whole study period. The highest jassid population was found during June and population reduced at the last week of July. Jassid population had significant positive relationship with temperature and significant negative relationship with relative humidity and rainfall. The weather parameters contributed 63.1% abundance of jassid population. But temperature had the most important effect which contributed 31.4% population fluctuation of jassid. Okra shoot and fruit borer population was the lowest during May and the highest at the end of June. There were non-significant relationship between okra shoot and fruit borer population and weather parameters. Multiple regression equation exerted 15.2% effect of weather parameters on okra shoot and fruit borer population abundance.

Keywords: Amrasca biguttula, Earias vitella, Temperature, Relative humidity, Rainfall, jassid, Okra

Location: Entomology Division, Bangladesh Agricultural Research Institute, Gazipur

Start Date: 00-04-2016

End Date: 00-07-2016

Program Area: Pest Management

Commodity: Okra, Insects

Objectives:

This study was undertaken to measure the population dynamics of jassid, and shoot and fruit borer of okra in relation to meteorological factors.

Methodology:

The field study was laid out in a Randomized Complete Block Design (RCBD) with three replications in the field of the Entomology Division, Bangladesh Agricultural Research Institute. The unit plot size was 9 m × 4 m. The inter block distance was 2 m and inter plot distance was 1m. There were three blocks and `each block was composed of three experimental unit plots along with an untreated control plot. Five pheromone traps of okra shoot and fruit borer were set in the experimental at as equal distance (108 m²). Number of jassid was counted and recorded every 3 days intervals during early morning from 5 leaves of randomly selected 5 plans plot^-1. Mean jassid number leaf^-1was calculated by using the collected data from all plots. Population of adult okra shoot and fruit borer were counted from pheromone trap catches and recorded at 3 days interval. The mean number okra shoot and fruit borer trap^-1 was determined from total trap catches. The weather data of temperature, relative humidity and rainfall during the experimental period were collected from the meteorological observatory section of Bangladesh Rice Research Institute (BRRI), Gazipur. The relationship of weather parameters on the population abundance of jassid and OSFB were determined by simple regression. The combined effects of temperature, relative humidity and rainfall on the population abundance of insects were measured by using a Multiple Linear Regression Equation. All the analyses were performed using IBM SPSS statistics 21.

Source of Information: Bangladesh J. Agril. Res. 44(3): 493-499, September 2019

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjar.v44i3.43480

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Present study showed population fluctuation of the jassid and OSFB in summer season. The highest jassid, and okra shoot and fruit borer population was found during June. The weather parameters showed significant effect on jassid population abundance but insignificant effect on okra shoot and fruit borer population abundance.

Knowledge Management: Journal