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Effects of Weather on the Abundance and Infestation of Major Insect Pests of Sweet Gourd in Gazipur

Mansura Afroz
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Ruhul Amin
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Ramiz Uddin Miah
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

M Mofazzal Hossain
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abstract/ Executive Summary:

The study was to assess the infestation of red pumpkin beetle, epilachna beetle and fruit fly on 12 germplasm of sweet gourd Cucurbita moschata. The study also investigated the effect of weather parameters on the abundance of the insects. Red pumpkin beetle, epilachna beetle and fruit fly showed the highest level of infestation during 3^rd week of December, 3^rd week of January and 4^th week of February, respectively. All the insects revealed the lowest level of infestation on BD274 and BD277 germplasm. Relative humidity had insignificant positive correlation with all the insects. Red pumpkin beetle showed significant positive correlation with temperature. Epilachna beetle exerted significant positive correlation with rainfall. The weather parameters jointly contributed 35.2% abundance of red pumpkin beetle and temperature individually depicted the highest effect (18.9%). Rainfall revealed the highest contribution (44.4%) on the abundance of epilachna beetle and the combined effect of the weather parameters was 66.5%. Temperature, relative humidity and rainfall showed 43.2% contribution on fruit fly abundance and the individual effect of relative humidity was the highest (27.0%).

Keywords: Cucurbit, Sweet gourd, Fruit fly, Epilachna beetle, Red pumpkin beetle, Meteorological factors

Location: Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh.

Start Date: 00-11-2018

End Date: 00-03-2019

Program Area: Pest Management

Commodity: Diseases and insects

Objectives:

1. To find out the relationship of the abundance of red pumpkin beetle, epilachna beetle and fruit fly with different weather parameters, and

2. To assess the varying infestation level of the insects on 12 germplasm of sweet gourd.

Methodology:

The study was conducted during November, 2018 to March, 2019 in the field of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh. The site is located at 25°25′ North latitude and 89°5′ East longitude. The seeds of 12 sweet gourd germplasm, namely BARI Mistikumra1, BARI Mistikumra 2, BD 264, BD 265, BD 266, BD 268, BD 269, BD 274, BD 275, BD 277, Gazipur local line and China line were collected from Bangladesh Agricultural Research Institute, local market of Gazipur and Department of Entomology, BSMRAU, and sown in polybags on November 14, 2018 to raise seedlings. The germplasm were cultivated in the experimental field following randomized complete block design with three replications having plot size 4.0 m × 3.0 m. The spacing between block to block and plot to plot was 1.0 m in both cases. Seedlings were transplanted to the field on December 4, 2018. All the intercultural operations except insect pest management were done whenever necessary and fertilizers were applied according to Fertilizer Recommendation Guide (FRG, 2018). Systemic sampling following five replications was employed to collect data. Observations were made at weekly interval to count the total number of leaf and number of infested leaf (by red pumpkin beetle and epilachna beetle), and total number of fruit and number of infested fruit by fruit fly. Numbers of leaf and fruit infested data were converted into per cent level of infestation. Daily mean temperature, relative humidity and rainfall data were collected from the weather station of BSMRAU. Correlation coefficients and Multiple Linear Regression Models were used to determine the relationship and contribution of weather parameters to the abundance of the insects. All the analyses were performed using IBM SPSS 21.0.

Source of Information: Bangladesh J. Zool. 47(2): 285-291, 2019

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjz.v47i2.44339

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The result of the present study is the higher level of infestation (20.0 to 61.0%) at maturity stage. The effect of temperature and relative humidity on fruit fly abundance was 10.2⁰C and 27.0%, respectively. The joint effect of temperature and relative humidity was 37.2%. Temperature, relative humidity and rainfall showed 43.2% contribution and the individual effect of rainfall was 6.0% on the abundance of fruit.

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