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Incidence of Litchi Mite, Aceria Litchi Keifer on Some Litchi Varities and Its Control

MD. ABOUS SALAM
Department of Entomology, Bangladesh Agricultural University, Mymcnsingh

Abstract/ Executive Summary:

The litchi mite, Aceria litchi Keifer is one of the most destructive pests of litchi and was studied at Horticulture Fann, BAU and HonicuJturc centre ' Kewatkhali, Mymensingh to know the incidence and extent of damage, brief morphology and life history, varietal susceptibility, relationship of mite infestation with weather elements and control approaches of the pest. The mite infestation was found throughout the year. The highest infestation was found to be in the first week of September and lowest infestation in the middle of March in all the five litchi varieties studied. The highest infestation was recorded in Bombai (43.867 infested twigs/plant; and 75.875 infested leaves/plant), and the lowest infestation was recorded in Mangalbari (8.668 infested twigs/plant; and 19.245 infested leaves/plant). Mean infestation level of the five litchi varieties was significantly different from one another in both number of infested twigs/plant and infested leaves/plant at 1% level (DMRT). The litchi infestation was found to be significantly positively correlated with relative humidity and rainfall, and negatively correlated with sunshine hours. There was no relation of A. litchi incidence with temperature and wind speed.

Keywords: Incidence,Litchi mite, Aceria litchi, Keifer, Control

Location: At Horticulture Farm, BAU and HonicuJturc centre ' Kewatkhali, Mymensingh

Start Date: 00-01-1999

End Date: 00-04-2000

Program Area: Pest Management

Commodity: Litchi

Objectives:

To know the incidence and extent of damage, brief morphology and life history, varietal susceptibility, relationship of mite infestation with weather elements and control approaches of the pest.

Methodology:

The present research work on the litchi mite, Aceria litchii Keifer was conducted at two locations: Horticulture Farm Bangladesh Agricultural University, Mymensingh, and Horticulture Centre, Kewatkhali, Mymensingh, during the period from January, 1999 to April, 2000. The principal investigations were carried on the following: a . Incidence of litchi mite and extent of damage to litchi plants. n. Systematic position, brief morphology and life history of the litchi mite. 111. Varietal susceptibility of litchi to litchi mite. av. Relationship of mite infestation with weather elements. v. Effectiveness of different control approaches to litchi mite. 3.1 Climate of experimental area 3.J.J Soil Five varieties of litchi, namely Bedana, Mangalhari, Mw.atfarpuri, China-3 and Bombai were included to study their varietal susceptibility to the litchi mite. The experiment was designed in a Completely Randomized Design (CRD) with five varieties as treatment and ten replications. Ten litchi plants of each variety were considered for data collection and one plant served as a treatment replication. For collecting data each plant of five varieties was inspected twice a month for the incidence of litchi mite infestation. In a plant, number of twigs and number of leaves infested were counted by eye estimation. rlbe farmer was tenned as incidence and the latter as severity. Counting of infested leaves was started from 01 January, 1999 and 35 continued up to 15 October, 1999. Similarly, counting of infested twigs was; started from 01 August, 1999 and was continued up to 15 October 1999. Counting infested twigs and leaves from all plants in all varieties was averaged for comparing the difference in the level of infestation among the varieties.

Source of Information: Department of Entomology Bangladesh Agricultural University, Mymcnsingh, Bangladesh.

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Achievement/Findings:

The mite infestation was found throughout the year. The highest infestation was found to be in the first week of September and lowest infestation in the middle of March in all the five litchi varieties studied. The highest infestation was recorded in Bombai (43.867 infested twigs/plant; and 75.875 infested leaves/plant), and the lowest infestation was recorded in Mangalbari (8.668 infested twigs/plant; and 19.245 infested leaves/plant). Mean infestation level of the five litchi varieties was significantly different from one another in both number of infested twigs/plant and infested leaves/plant at 1% level (DMRT) The litchi infestation was found to be significantly positively correlated with relative humidity and rainfall, and negatively correlated with sunshine hours. There was no relation of A. which incidence with temperature and wind speed.

Knowledge Management: