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Seasonal Fluctuation and the Management Tactics of Guava Whitefly, Aleurodicus Dispersus

M. I. Khalil
Principal Scientific Officer, Bio-Tech Division, Ispahani Agro Limited, Bangladesh

M. A. Haque
School of Agriculture and Rural Development, Bangladesh Open University, Gazipur-1705

M. A. Chowdhury
Practical Action Bangladesh, Dhaka, Gazipur-1705, Bangladesh.

Abstract/ Executive Summary:

An Aleurodicus dispersus has become one of the most serious pests of guava in Bangladesh. The study on seasonal abundance in different months indicated that the maximum whitefly population occurred during March 2016 to November 2017. Comparison the effectiveness of application of water, detergent and smoke, it was found that spraying of detergent on the twigs reduced the number of whiteflies significantly. Study of chemical control on whitefly to reduce the population at different stages revealed that Diazinon at the dose of 0.18% reduced the whitefly population (> 90%) significantly after 3, 7, 15 and 30 days of spraying which is similar with the dose of 0.18%. a.i. of Malathion 57EC which caused a good reduction of whitefly adults and nymphs for several days of time interval. Both insecticides were effective and persistent when applied at higher dose to A. dispersus. Therefore, among the treatments the spray at 0.18% concentration of Malathion and Diazinon was the best in controlling the whitefly.

Keywords: Guava, White fly, Control, Malthion, Diazinon

Location: Kalihati Sadar Upazilla, Tangail

Start Date: 00-03-2016

End Date: 00-11-2017

Program Area: Pest Management

Commodity: Fly

Objectives:

The present study was undertaken to determine the seasonal abundance and the effective control methods of this pest. The effective control measures may impact to slow down the uses of pesticides and therefore, support to integrated pest management on a sustainable basis.

Methodology:

The experiment was conducted in the Pot house of the Department of Crop Botany of Bangladesh Levels of whitefly infestation in different months were studied on the variety 'Kazipiara'. Notably infested plants were selected and four twigs of different sides (east, west, north and south) were chosen randomly from each plant. The total number of nymphs and adults of whitefly were recorded per twig. Control of whitefly using water, detergent and smoke There were three treatments including water as a control, detergent and smoke were used to investigate as non-insecticide or mechanical approaches. Detergent was applied by mixing with water to suppress whitefly populations. The foot paddle sprayer was used for spraying of water and the detergent. The concentration of the detergent was 2.5 g/L. Smoke acts as a physical repellent of insect. Here smoke of 'Dhup' was used to control whitefly. The number of nymphs and adults per twig having around 10 leaves were recorded after 1 hr, 1, 5 and 10 days of application of water, detergent and smoke. Effectiveness of two selected insecticides in controlling whitefly Two insecticides viz. Diazinon 60EC and Malathion 57EC were sprayed with the aim of controlling the whitefly. Each insecticide was tested with three different doses and efficacy of the doses on whitefly was compared. The doses of 0.06, 0.12 and 0.18% were applied with the help of a hand-operated sprayer. Before each application, the sprayer was calibrated without insecticides in order to use the right dose on the plants by determining the quantity of water required for each plant. The control plants were sprayed only with water. The number of nymphs and adults per infested twig having around 10 leaves were recorded randomly after 1, 3, 7, 15 and 30 days of spraying of insecticides. The experiment was designed in a Randomized Complete Block Design (RCBD) in the standing guava orchard. Treatments were replicated 4 times for water, detergent, smoke and replicated 5 times for insecticides. Here, a plant was considered as one replication. Assessment of reduction of whitefly due to use of water, detergent, smoke and insecticides were observed and analyzed using two ways ANOVA. Guava plants range between 5 to 6 years old were selected for the experiment at the commercial guava orchard of a selected farmer at Kalihati Sadar Upazilla, Tangail for the period from March 2016 to November 2017.

Source of Information: J. Biosci. Agric. Res. 19 (02): 1639-1645

Article Link (Online Journal): https://doi.org/10.18801/jbar.190219.198

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The nymphs and adults of spiralling whitefly, A. dispersus cause considerable damage of guava plants. The study on seasonal abundance in different months indicated that the maximum whitefly population occurred during the month of January to March. Comparing the effectiveness of application of water, detergent and smoke, it was found that spraying of detergent on the twigs reduced the number of whiteflies significantly than other treatments. The application of the insecticides Diazinon 60EC and Malathion 57EC against A. dispersus resulted in a significant reduction of the pest in guava. Diazinon at the dose of 0.18% reduced the whitefly population (> 90%) significantly after 3, 7, 15 and 30 days of spraying which is similar with the dose of 0.18% a.i. of Malathion 57EC that caused a good reduction of whitefly adults and nymphs for several days of time interval. Both insecticides were effective when applied at higher dose and had a good persistent effect for the pest A. dispersus. Therefore, 0.18% concentration of Malathion and Diazinon could be sprayed against whitefly.

Knowledge Management: Journal