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Titolo:
An economic study of the biological control of the spiny blackfly, Aleurocanthus spiniferus (Hemiptera : Aleyrodidae), in a citrus orchard in Swaziland
Autore:
van den Berg, MA; Hoppner, G; Greenland, J;
Indirizzi:
Inst Trop & Subtrop Crops, ARC, ZA-1200 Nelspruit, South Africa Inst Trop & Subtrop Crops Nelspruit South Africa ZA-1200 t, South Africa Inyoni Yami Irrigat Scheme, Tshaneni, Swaziland Inyoni Yami Irrigat Scheme Tshaneni Swaziland heme, Tshaneni, Swaziland
Titolo Testata:
BIOCONTROL SCIENCE AND TECHNOLOGY
fascicolo: 1, volume: 10, anno: 2000,
pagine: 27 - 32
SICI:
0958-3157(200002)10:1<27:AESOTB>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Keywords:
Encarsia cf. smithi; Aphelinidae; Aleurocanthus spiniferus; spiny blackfly;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: van den Berg, MA Inst Trop & Subtrop Crops, ARC, Private Bag X11208, ZA-1200 Nelspruit, South Africa Inst Trop & Subtrop Crops Private Bag X11208 Nelspruit South Africa ZA-1200
Citazione:
M.A. van den Berg et al., "An economic study of the biological control of the spiny blackfly, Aleurocanthus spiniferus (Hemiptera : Aleyrodidae), in a citrus orchard in Swaziland", BIO SCI TEC, 10(1), 2000, pp. 27-32

Abstract

Control costs and direct crop losses die to infestations by the spiny blackfly, Aleurocanthus spiniferus Quaintance, were studied in orchards of a 667 ha citrus estate, Inyoni Yami Irrigation Scheme at Tshaneni, Swaziland inthe 1995/96 season the control costs and dir ect losses at this estate amounted to R 476 000 ( approximate to US$ 86 500). This excludes the reduction in growth, the additional costs of sorting sooty mould-stained fruit and the potential reduction in crop production of the next season. To import, rear and establish the spiny blackfly parasitoid, Encarsia cf smithi (Silvestri), including the project overheads, amounted to R 169 750 (approximate to US$ 30 900). Because of the classical biological control that was achieved, no chemical control of this pest was necessary during the following two seasons and no further losses of fruit were incurred due to sooty mould. The amount spent to establish biological control of the spiny blackfly, in parts of Southern Africa, even if compared to the direct losses and control costs of a single season on one citrus estate was exceptionally cost effective. A benefit ratio was calculated at 2.8.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:28:48