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Further studies of the encapsulation of eggs ofMetaphycus spp. (Hym.: Encyrtidae) by the pyriform scale,Protopulvinaria pyriformis (Hom.: Coccidae)

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Abstract

The encapsulation of eggs ofMetaphycus swirskii Annecke & Mynhardt (Hymenoptera: Encyrtidae) by the pyriform scale,Protopulvinaria pyriformis (Cockerell) (Homoptera: Coccidae), collected in the coastal plain of Israel, was determined during April 1986 to May 1987. The rates of encapsulation were low in November (13.0%) and relatively high in April, May, August and September (32.0–89.0%).

The seasonal variations in the encapsulation of eggs ofM. stanleyi Compere and/orM. swirskii byP. pyriformis infesting avocado (Persea americana) and jambolan (Syzygium cumini) were studied at Miqwe Yisra'el (coastal plain) during October 1986 to February 1988. Encapsulation rates were similar in scales infesting either of the two host plants. They were highest during July to August (49.0–75.0%) and lowest during December to February (0.9–10.0%). Encapsulation incidence at Miqwe Yisra'el was correlated with the ambient temperatures (r=0.89).

The rate of encapsulation of parasitoid eggs (M. stanleyi and/orM. galbus Annecke) recorded inP. pyriformis sent to Israel from Spain in September 1987 was 42.2%.

The high rates of encapsulation ofMetaphycus spp. eggs byP. pyriformis during the summer, may interfere with efficient biological control of the pest.

Résumé

D'avril 1986 à mai 1987, des œufs deMetaphycus swirskii Annecke & Mynhardt (Hym.:Encyrtidae) ont été récoltés dans la plaine côtière d'Israël pour étudier leur encapsulation par la Pulvinaire pyriforme,Protopulvinaria pyriformis (Cockerell) (Homoptera: Coccidae). Les taux d'encapsulation étaient faibles en novembre (13%) et relativement élevés en avril, mai, août et septembre (32%–89%).

Les variations saisonnières de l'encapsulation des œufs deM. stanleyi Compere et/ou deM. swirskii parP. pyriformis infestant l'avocat (Persea americana) et le jambolan (Syzygium cumini) ont été étudiées à Miqwe Yisra'el (plaine côtière) d'octobre 1986 à février 1988. Les taux d'encapsulation étaient similaires chez les cochenilles vivant sur l'une et l'autre plante. Ils étaient les plus élevés en juillet et août (49%–75%) et les plus bas de décembre à février (0.9–10%). L'encapsulation à Miqwe Yisra'el était corrélée avec les températures ambiantes (r=0,89).

Le taux d'encapsulation des œufs de parasitoïdes (M. stanleyi et/deM. galbus Annecke) relevés chezP. pyriformis envoyés d'Israël en Espagne en septembre 1983 était de 42%. Le taux élevé d'encapsulation des oeufs deMetaphycus spp. parP. pyriformis au cours de l'été, peut avoir une influence sur l'efficacité de la lutte biologique contre ce ravageur.

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Authors and Affiliations

  1. Department of Entomology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

    D. Blumberg, M. Wysoki & D. Hadar

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  1. D. Blumberg
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  2. M. Wysoki
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  3. D. Hadar
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Blumberg, D., Wysoki, M. & Hadar, D. Further studies of the encapsulation of eggs ofMetaphycus spp. (Hym.: Encyrtidae) by the pyriform scale,Protopulvinaria pyriformis (Hom.: Coccidae). Entomophaga 38, 7–13 (1993). https://doi.org/10.1007/BF02373134

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  • DOI: https://doi.org/10.1007/BF02373134

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