e-ISSN 2231-8542
ISSN 1511-3701

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Factors Affecting Ovipositional Behaviour of Scutellista cyanea, an Egg-parasitoid of Hemispherical Scale

A. Ghani Ibrahim

Pertanika Journal of Tropical Agricultural Science, Volume 7, Issue 3, December 1984

Keywords: Scutellista cyanea; Saissetia coffeae, egg- parasitoid opposition; adult longevity.

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Scutellista cyanea Motschulsky is an egg parasitoid of many coccids, including the hemispherical scale, Saissetia coffeae. The adult female parasitoid oviposits in gravid scale, S. coffeae. Ambient temperature influences the number of eggs deposited and adult longevity of the parasitoid. The life-span of the adult parasitoid was found to be reduced with an increase in temperature; at 20°C longevity it was 80.0 days while at 28°C it was only 30 days. On the other hand, an increase in temperature within limits would increase the total number of eggs deposited by the parasitoid. In a comparison of two sizes of host-scale i.e. scale >3.5mm in length and <2.5mm in length, the result showed that significantly (p<0.05) greater parasitoid progency emerged from host scale of >3.5mm in length. The relationship between head width and adult longevity and between head width and egg production are r=0.90 and r=0.93.

ISSN 1511-3701

e-ISSN 2231-8542

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