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Incidence of Spiraling Whiteflies Aleurodicus Dispersus Russell (hemiptera: Aleyrodidae) and Its Natural Enemies on Guava Orchards

M Arifunnahar
Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Z Ferdous
Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

MA Alim
Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

MA Hossain
Author for correspondence
Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Abstract/ Executive Summary:

Population dynamics of spiraling whitefly and its natural enemies on guava orchards are essential for improvement of existing pest control methods. To find out the seasonal abundance of guava whitefly and its natural enemies and levels of infestations were studied on guava orchards severely infested by A. dispersus. Five guava plants were selected randomly. To determine each stage of the insect density, six leaves comprising upper, middle and lower part of each plant were randomly sampled. Sooty mould infested leaves and presence of natural enemies of A. dispersus were also recorded. The highest number of egg mass (5.0) and nymphs (10.0) per leave were found in the month of September. The highest (0.20%) ladybird beetle, Scymnus sp. (Coccinellidae: Coleoptera) and Encarsia sp. (0.15%) were found in the months of October and January, respectively. The number of leaves infested with sooty mould fungus was estimated highest (93%) during October to January. A. dispersus population was peak in the months of August to January and the associated natural enemies may successfully contribute to the existing pest control methods.

Keywords: Guava, Infestation, Natural enemies, Spiraling whitefly

Location: Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur, Bangladesh

Start Date: 00-09-2011

End Date: 00-08-2012

Program Area: Crop-Soil-Water Management

Commodity: Guava, Insects

Objectives:

To find out the seasonal abundance of guava whitefly and associated its natural enemies in different guava orchards in the northern part of Bangladesh.

Methodology:

Experimental site and climatic conditions: The experiment was conducted at Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur from September 2011 to August 2012. The experimental site was located at 25? 13′ N latitude and 88? 23′ E longitudes at elevation of 37 m above the sea level. Seasonal abundance of A. dispersus and associated its natural enemies were studied in three guava gardens at HSTU. The orchards were separated 50 to 100 meters apart. The experimental area was under subtropical climate characterized by high temperature, high humidity and heavy precipitation with occasional winds in April to September. But scanty rainfall associated with moderate low temperature during October to March. Data on temperature and relative humidity (RH) were recorded by Hobo data logger (H8-003-02, Onset Computer Corporation, Bourne, MA, USA). Data collection: Levels of infestations in different months of the year were studied on guava orchards that were severely infested by A. dispersus. In each orchard, five guava plants were selected randomly. To determine the number of A. dispersus, six leaves comprising two from upper, two from middle and two from lower part of each plant were sampled randomly. From each garden, a total 30 leaves were sampled for and observed insect infestation. The number of egg masses, nymphs, and adults of A. dispersus were counting on every sampling day. Sooty mould infested leaves and presence of natural enemies of A. dispersus were also recorded. Orchards were free from insecticide applications during the study period. Statistical analyses: The mean number of egg masses, nymphs, adults and sooty mould infested leaves and their natural enemies in the orchards were analyzed with analysis of variance (ANOVA) and Tukey-type multiple comparison tests for post-hoc analysis (Zar 2010) using SPSS software (version 16.0).

Source of Information: J. Bio-Sci. 24: 67-74, 2016; ISSN 1023-8654

Article Link (Online Journal): http://www.banglajol.info/index.php/JBS/index

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The survey results indicated that the incidence of A. dispersus population was peak in the months of August to January while no infestation was found in the months from February to July because of high temperature and high rainfall. Thus the information of seasonal incidence of spiraling whitefly and its associated natural enemies might successfully contribute to the existing pest control methods and the development of new control strategies for guava orchards in Bangladesh.

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