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Population Abundance of Red Spider Mite in Different Vegetables Along with Its Spatial Distribution and Chemical Control in Brinjal (solanum Melongena L.)

N. K. Dutta
Senior Scientific Officer
Entomology Division, Bangladesh Agricultural Research Institute (BARl), Joydebpur, Gazipur, Bangladesh.

S. N. Alam
Chief Scientific Officer (In-charge)
Entomology Division, Bangladesh Agricultural Research Institute (BARl), Joydebpur, Gazipur, Bangladesh.

M. K. Uddin
Scientific Officer
Entomology Division, Bangladesh Agricultural Research Institute (BARl), Joydebpur, Gazipur, Bangladesh.

M. Mahmudunnabi
Scientific Officer
Entomology Division, Bangladesh Agricultural Research Institute (BARl), Joydebpur, Gazipur, Bangladesh.

M. F. Khatun
Scientific Officer
Entomology Division, Bangladesh Agricultural Research Institute (BARl), Joydebpur, Gazipur, Bangladesh.

Abstract/ Executive Summary:

Population abundance of red spider mite, Tetranychus urticae Koch., was studied in cucmber, ribbed gourd, bitter gourd, snake gourd, aroids and teasle gourd and efficacy of four new acaricides were tested against this pest in brinjal at the farmer's field of Norsingdi during 2009-2010. At the same time, the spatial distribution of this pest in brinjal crop was also studied. Results indicated that all the surveyed vegetables except bitter gourd were attacked by the mite with varying levels of infestation. However, the highest mite population per leaf was observed in brinjal (32.27) which was followed by cucumber (16.08) and teasle gourd (7.2). Mites were most densely populated in the lower canopy region in the brinjal plant. Among the tested acaricides, Lakad 1.8 EC (Abamectin) provided the highest (83.4%) reduction of mite population over control, although the other acaricides also gave good control of this pest.

Keywords: Red spider mite, Population abundance, Spatial distribution, Chemical control

Location: Norsingdi

Start Date: 00-00-2009

End Date: 00-00-2010

Program Area: Pest Management

Commodity: Brinjal

Objectives:

To study the population abundance of red spider mite in brinjal, cucumber, snake gourd, teasle gourd, aroid, bitter gourd, and ribbed gourd.

Methodology:

Field survey was conducted in Norsingdi region during 2009-10 for studying the population abundance of red spider mite in brinjal, cucumber, snake gourd, teasle gourd, aroid, bitter gourd, and ribbed gourd. Three fields for each vegetable were randomly selected. In each field, 15 plants were also selected randomly. Mite population was counted from the 6 leaves of each plant with the help of a magnifying glass. Three surveys were conducted in each crop starting from the initiation of the pest attack at an interval of 10 days. Furthermore, an experiment was conducted in the farmer's field at Norsingdi during 2009 to evaluate the efficacy of some new acaraicides against the red spider mites attacking brinjal. Brinjal seedlings of Shingnath variety were transplanted in a plot of 6m x 3.6m having plant spacing of 60cm and row spacing of 1 m. The experiment was laid out in RCBD having three replications and 5 treatments including control. Standard agronomic practices were followed to raise the crop. Two sprays of each treatment were done at 15 days interval. The treatments were assigned as follows: Spraying of Lakad 1.8 EC (Abamectin) @ 1.2 ml/litre of water, spraying of Hisulphar 80WP (Sulphur) @ 4.0 g/Iitre of water, spraying of Talstar 2WP (Bifenthrin) @ 4.0 g/Iitre of water, spraying of Omite 57 EC (Propargite) @ 1.0 ml/litre of water anduntreated control. All the acaricides were applied at the aforesaid doses by high volume knapsack sprayer. During application, care was taken to maintain the distance around 25 cm between the nozzle and plant parts. The whole plant was thoroughly covered by spray fluid. Sprayer was washed and cleaned after each acaricide spray. In each plot, 6 plants from middle two rows were selected for data recording. Mite population was counted from the 6 leaves of each plant with the help of a magnifying glass. In each plant, two leaves were selected randomly from upper canopy, two from middle canopy, and two from lower canopy for counting mite population. Data were analyzed by using MSTAT-C software for analysis of variance following randomized completely block design (RCBD) and treatment means were separated by applying Duncan's Multiple Range Test (DMRT) at 1 % level of significance.

Source of Information: BANGLADESH JOURNAL OF AGRICULTURAL RESEARCH, Vol-37 (3), pp. 399-404, September 2012, ISSN 0258-7122.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that all the surveyed vegetables except bitter gourd were attacked by the mite with varying levels of infestation. However, the highest mite population per leaf was observed in brinjal (32.27) which was followed by cucumber (16.08) and teasle gourd (7.2). Mites were most densely populated in the lower canopy region in the brinjal plant. Among the tested acaricides, Lakad 1.8 EC (Abamectin) provided the highest (83.4%) reduction of mite population over control, although the other acaricides also gave good control of this pest.

Knowledge Management: Journal