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


Citation

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

Abstract / Synopsis

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.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Publisher: Universiti Putra Malaysia Press
Keywords: Dreparwcoccus chiton, nympal development,field, parasitisation, Eunotus sp., carambola orchard
Depositing User: Nasirah Abu Samah
Date Deposited: 25 Nov 2009 10:31
Last Modified: 27 May 2013 15:06
URI: http://psasir.upm.edu.my/id/eprint/3279
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