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Effectiveness of Spraying Time for Judicial Use of Insecticides in Controlling of Fruit Fly

MA Rahaman*
Sector Coordinator –Food Security, Mennonite Central Committee Bangladesh, 4/10, Iqbal Road, Block –A, Mohammadpur, Dhaka –1207, Bangladesh

M Jahan
Department of Entomology, Bangladesh Agricultural University, Mymensingh –2202, Bangladesh

KS Islam
Department of Entomology, Bangladesh Agricultural University, Mymensingh –2202, Bangladesh

SN Alam
Entomology Division, Bangladesh Agricultural Research Institute, Gazipur –1700, Bangladesh

Abstract/ Executive Summary:

A study on effectiveness of spraying time for judicial use of insecticides in controlling of fruit fly was conducted in farmers’ filed during March to May, 2011 in Bogra district. The insecticide Nitro-505EC was selected as test insecticide and bitter gourd was as test crop for this experiment. The insecticide was sprayed three times as treatments viz. spraying early in the morning (7:00am to 8:00am), spraying at noon (12:00 noon to 1:00pm) and spraying before evening (4:00pm to 5:00pm) and was compared with the untreated control. The lowest infestation (26.80%) by cucurbit fruit fly was found after spraying of insecticide in the afternoon (4:00pm to 5:00pm) and the maximum fruit infestation was found in the untreated control treatment (60.24%). Significant differences were found in percent of infested fruits immediate after three days, but after seven days there was no significant differences among the treatments.

Keywords: Bactrocera cucurbitae, Insecticide spraying time, Fruit fly, Infestation, Bitter gourd

Location: Sadar upazial of Bogra district

Start Date: 00-03-2011

End Date: 00-05-2011

Program Area: Pest Management

Commodity: Insecticide, Insects

Objectives:

Spray time influence the effectiveness of pesticide application and study regarding suitable spray time is important to control cucurbit fruit fly.

Methodology:

This study was undertaken at Sadar upazial of Bogra district from March to May 2011 to identify the most appropriate spraying time of insecticide in controlling cucurbit fruit fly of bitter gourd. Treatments and replication: The insecticide Nitro-505EC was selected for this experiment from the result of efficacy study. The applied dose was 1 ml liter-1of water. There were four treatments viz. T1= Control (untreated), T2= Spray early in the morning (7:00am to 8:00am), T3= Spray at noon (12:00 noon to 1:00pm) and T4= Spray before evening (4:00pm to 5:00pm) and each treatment had three replications. Spraying was started from the first incidence of the pest with the recommended dose. Experimental design: Randomized complete block design (RCBD) was followed for setting experiment where, land size was 20 m x19 m = 380 m² and the subplot size was 5.66 m x 2.75 m = 15.57 m². Planting distance 182 cm x158 cm was maintained. Cultural management: Between two plots 50 cm gap was maintained for proper irrigation and drainage. Whole of Compost of 1000 kg and the fertilizers TSP: 4 kg, MP: 2.5 kg, Boron: 250 g and Zinc: 250 g and one third of Urea: 1.25 kg plot^-1 were applied. Rest two doses of urea were applied as top dressing and other management operations like irrigation, weeding, hoeing etc. were practiced as per recommendations. Data collection and statistical analysis: For time efficacy, short duration is better to observe the efficacy. That is why data were recorded on level of infestation (%) at three and seven days after spraying (DAS) to find out the effective spraying time. The level of infestation was maintained upto zero before each spraying through proper sanitation like removing of infested and rotten fruits. The data collected from the study were arranged in tabular form in excel worksheet and processed for further analysis. All the statistical analyses was performed using SPSS statistical package 11.5 version, at 1% level of significance.

Source of Information: J. Sylhet Agril. Univ. 3(1):37-40, 2016 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Efficacy of insecticide depending on spraying time was observed, where it was found that the lowest infestation (26.80%)was in bitter gourd by cucurbit fruit fly after spraying of insecticide mostly in the afternoon (4:00pm to 5:00pm). The maximum fruit infestation was found in the untreated control treatment (60.24%). Spraying both the upper and lower surface of trellis in the afternoon (4:00pm to 5:00pm) will give better effectiveness against cucurbit fruit fly. After a certain period of insecticide application its efficacy might not be effective, which is possible immediate after application.

Knowledge Management: Journal