Beetle heads down south
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CTA. 2000. Beetle heads down south. Spore 87. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/46809
Internet URL: http://spore.cta.int/images/stories/pdf/old/spore87.pdf
It may be that only the sea at the Cape of Good Hope can halt the inexorable advance of the larger grain borer (LGB), Prostephanus truncatus, in southern Africa. Even that might not help, since it arrived from the Americas by boat, in a food relief...
It may be that only the sea at the Cape of Good Hope can halt the inexorable advance of the larger grain borer (LGB), Prostephanus truncatus, in southern Africa. Even that might not help, since it arrived from the Americas by boat, in a food relief shipment to Tanzania in the late 1970s. The dark coloured beetles, around 4 mm long, are extremely damaging to dried maize stored on the cob. Losses can reach more than 30% after six months of storage. Since its arrival, the borer has spread relentlessly throughout sub-Saharan Africa. It was reported to have entered South Africa and Namibia in 1999. Chemical insecticides, such as Actellic Super Dust, are effective in controlling LGB. Alternative storage techniques and hygienic measures around the storage sites are also important. According to Peter Golob of the Natural Resources Institute, United Kingdom, the key to good non-chemical control may be a predator of LGB discovered in Central America, the beetle Teretrius nigrescens (TN). After successful laboratory trials, TN was released in Ghana, Kenya, Togo, Uganda and Zambia where it established itself widely. Unfortunately, it will never be adequate to contain LGB, which breeds more quickly than TN and can multiply rapidly, even when TN is present. Various measures therefore need to be combined to control the pest. To know more: Peter Golob Natural Resources Institute, University of Greenwich Kent ME4 4TB, UK Fax: +44 1634 883 567 Email: P.Golob@gre.ac.uk See 'Postharvest Forum Launched' in this section for address of the new postharvest forum, phAction, or visit FAO s website: www.fao.org/inpho FAO Sales and Marketing Group Viale delle Terme di Caracalla 00100 Rome, Italy Fax: +39 06 57 05 33 60 Email: email@example.com Larger grain borer: Prostephanus truncatus. CTA/GASCA. 1997. 14 pp. CTA number 575, 5 credit points