The Biology and Natural Control of the Scale Drepanococcus chiton (Green)(Homoptera : Coccidae), a Minor Pest of Carambola in Malaysia

Ibrahim, Abdul Ghani (1994) The Biology and Natural Control of the Scale Drepanococcus chiton (Green)(Homoptera : Coccidae), a Minor Pest of Carambola in Malaysia. Pertanika Journal of Tropical Agricultural Science, 17 (3). pp. 209-212. ISSN 0126-6128

[img] PDF
2556Kb

Abstract

The scale, Drepanococcus chiton (Green) (Homoptera: Coccidae) is a potential pest of carambola, variety Bl0 Averrhoa carambola. The insects caused drying of shoots and flower stalks. The regimental spraying of insecticides against the fruit flies, Bactrocera dorsalis, possibly gave rise to a build-up of the scale populations in a carambola orchard at Sungai Long, Ulu Langat, Selangor. The development of eggs to adult maturity at 28± 1.5 °C was 49.9± 1.06 days. A female scale could produce an average of 1081.9± 256.0 eggs with 97.9% viability. However, only 2.5% of these eggs reached adult maturity in the field. Field observation showed that the scales are being parasitised by an egg-parasitoid, Eunotus sp. (Hymenoptera: Pteromalidae). The average monthly parasitisation by Eunotus sp. from August 1992 to February 1993 was 40.6%. The parasitic larva was capable of destroying 93.2% of the scale's eggs during its larval development. The sex ratio of male to female parasitoid was 1 : 1.

Item Type:Article
Keyword:Dreparwcoccus chiton, nympal development,field, parasitisation, Eunotus sp., carambola orchard
Faculty or Institute:Faculty of Agriculture
Publisher:Universiti Putra Malaysia Press
ID Code:3279
Deposited By: Nasirah Abu Samah
Deposited On:25 Nov 2009 02:31
Last Modified:27 May 2013 07:06

Repository Staff Only: Edit item detail


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.