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Role of Abiotic Factors and Chemical Insecticides on the Incidence of Rose Budworm and Thuja Bagworm

MA Islam
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

MR Amin*
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

The study was conducted to assess the seasonal incidences of budworm Helicoverpa virescens (Lepidoptera: Noctuidae) and bagworm Thyridopteryx ephemeraeformis on rose and thuja plants, respectively. The study also investigated the effect of the chemical insecticides Proclaim 5SG and Talstar 2.5EC on the abundances of the above mentioned insect pests. The findings revealed that both the insects pests occurred from December to May. However, budworm reached to the peak abundance in the month of January, while bagworms reached the peak in March. Multiple regression analysis revealed that the weather parameters collectively influenced 10.3% and 11.2% incidences of budworm and bagworm, respectively. The individual as well as combined effect of the meteorological parameters on both the pests were insignificant. Proclaim 5SG and Talstar 2.5EC with their recommended doses significantly reduced the abundances of budworm and bagworm on the infested rose and thuja plants, respectively. The tested insecticides could be a tool for integrated management of rose budworm and thuja bagworm.

Keywords: Abundance, Helicoverpa virescens, Proclaim 5SG, Talstar 2.5EC, Thyridopteryx ephemeraeformis, Weather factors

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

Start Date: 00-11-2017

End Date: 00-05-2018

Program Area: Pest Management

Commodity: Insecticide, Rose

Objectives:

The study was conducted to understand the seasonal incidences of rose budworm and thuja bagworm, and their management with chemical insecticides

Methodology:

Study site and conditions: The study was conducted in the ornamental garden and laboratory of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during November 2017 to May 2018. The study site is located at 25°25′ N and 89°5′ E, which have annual average temperature, relative humidity and rainfall of 25.8o C, 67% and 2036mm, respectively (Mandal et al. 2018). Observation of the incidence of pests: Free-living moths of budworm and bagworm were captured from the rose and thuja plants, respectively. Insects were captured using a 30 cm diameter sweep net having 1.5 mm mesh, and attached with a 1.5 m long rod. Sweeping was done fortnightly interval in between 09.00 to 11.00 h of the day, and each sample was consisted of 30 sweeps encompassing an area from ground level to the top of the plants. The collected insects were brought to the Entomology Laboratory of BSMRAU for counting. Effect of chemical insecticides on the incidence of pests: Proclaim 5SG (Emamectin benzoate) was sprayed with several doses to control the rose budworm. The treatments were 0.5 g/L, 0.75 g/L (farmer’s practice), 1.0g/L (recommended) and 1.25g/L water and control (untreated). Number of budworm on the branches (30 cm) was counted at 1, 3 and 7 days after treatment. During every observation, three branches were randomly selected for each treatment and the number of larvae and moths per shoot were counted. Talstar 2.5EC (Cypermethrin) was sprayed to control the bagworm of thuja. The treatments were1.25 ml/L, 1.5 ml/L (farmer’s practice), 2.0 ml/L (recommended), 2.5 ml/L water and control (untreated). Data were collected at 1, 3 and 7 days after treatment. To collect data three branches (30 cm) were randomly selected for each treatment and number of bagworm (larvae and moths) per twig was counted. Collection of weather data: Temperature, relative humidity and rainfall data were collected from the weather station of BSMRAU. Data analysis: Data were analyzed using one-way analysis of variance (ANOVA) and the mean values were separated according to Tukey HSD posthoc test. Correlation coefficients between the abundance of the pests and meteorological parameters were calculated. All the analyses were performed using IBM SPSS 21.1 software.

Source of Information: Bangladesh J. Ecol. (2020) 2 (1) : 53-56

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Chemical insecticides cause death of the phytophagous insects due to the contact, stomach or systemic action of the poison. Rhainds and Sadof, (2009) reported that the application of Chlorantranilipole and Indoxacarb were effective in controlling bagworms. Topical applications of insecticides against bagworms were found the most effective in the spring, when recently emerged first instars have not yet constructed bags (Neal et al. 1987). In the present study, insecticides were sprayed on the plants and the larvae of the insects ingested food from the plants, therefore, insecticides caused their mortality and reduced population.

Knowledge Management: Journal