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M. A.  van den Berg and Greenland, J., ?First establishment of Encarsia cf. smithi (Hymenoptera: Aphelinidae), a parasitoid of the spiny blackfly, Aleurocanthus spiniferus (Hemiptera: Aleyrodidae), in southern Africa?, African Plant Protection, vol. 2, pp. 127-129, 1996.

M. A.  van den Berg and Greenland, J., ?Classical biological control of Aleurocanthus spiniferus (Hem.: Aleyrodidae), on citrus in southern Africa?, Entomophaga, vol. 42, pp. 459-465, 1997.

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M. A.  van den Berg and Greenland, J., ?Rearing and releasing methods for Encarsia cf. smithi (Hym.: Aphelinidae), used in a classical biological programme for the spiny blackfly, Aleurocanthus spiniferus?, Neltropika Bulletin, vol. No 303, pp. 56-58, 1999.

M. A.  van den Berg and Greenland, J., ?Pest status of two blackfly species on citrus in South Africa and Swaziland?, African Plant Protection, vol. 7, pp. 53-57, 2001.

M. A.  van den Berg, Höppner, G., and Greenland, J., ?Classical biological control of the spiny blackfly, Aleurocanthus spiniferus (Hem.: Aleyrodidae), an economic study. (Abstract 1684)?, in Abstracts, XXI International Congress of Entomology, Brazil, August 20-26, 2000, 2000, p. 424.

M. A.  van den Berg, Höppner, G., and Greenland, J., ?An economic study of the biological control of the spiny blackfly, Aleurocanthus spiniferus (Hemiptera: Aleyrodidae), in a citrus orchard in Swaziland?, Biocontrol Science and Technology, vol. 10, pp. 27-32, 2000.