Larger Grain Borer 2004 - 2016

The larger grain borer (Prostephanus truncatus), or LGB for short, is a beetle that attacks maize and dried cassava roots. LGB was introduced into Africa from meso-America in the late 1970s and since then has spread across the continent.

The Larger Grain Borer (Prostephanus truncatus) (3mm long in life)

When LGB attacks maize, the amount of weight loss is about double that associated with the conventional pests of maize. When calculating storage losses, APHLIS automatically estimates the weight losses due to the conventional storage pests. However, only when LGB is reported as a serious pest does the APHLIS calculator increases the losses, and when it does the storage weight loss is doubled.

The table below indicates the incidence of LGB infestation by country and by year. For each year the number of affected provinces is shown. In some years there will be no provinces affected, some years more, and some years less. This is expected as there are quite big variations between years in the severity of attack; this is believed to be related to climatic conditions at critical times in the year. In some cases there is no data available, this is indicated by a ‘-‘ in the table.

Number of affected provinces

Country Number of
Provinces
Reported number of affected provinces
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Angola   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Benin 11   -     -     -     -   6 6 6 6 6   -     -     -     -  
Botswana 9 0 0 0 0 0 0 0 0 0   -     -     -     -  
Burkina Faso 13   -     -     -     -   8 8 8 8 8 8 9 8   -  
Burundi   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Cameroon 10   -     -     -     -   10 10 10 10 10 10   -     -     -  
Chad   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Cote d`Ivoire   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Democratic Republic of Congo 10   -     -     -     -   0 0 0 0   -     -     -     -     -  
Eritrea   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Ethiopia 11   -     -     -   0 0 0 0 0 0 0 1 1   -  
Gambia   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Ghana   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Guinea   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Guinea-Bissau   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Kenya 8 7 7 7 7 7 7 7 7 7 7   -     -     -  
Lesotho 10 0 0 0 0 0 0 0 0 0 0   -     -     -  
Liberia   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Madagascar 22   -     -     -   0 0   -     -     -     -     -     -     -     -  
Malawi 3   -     -     -     -   3 3 3 3 3   -     -     -     -  
Mali 9   -     -     -     -   0 0 0 0 0 0   -     -     -  
Mauritania 12   -     -     -     -   0 0 0 0 0   -     -     -     -  
Mozambique 10 4 5 6 6   -     -     -     -     -     -     -     -     -  
Namibia   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Niger 8   -     -     -     -   0 0 0 0 0 0   -     -     -  
Nigeria 8   -     -     -     -   4 4 4 6 6 6   -     -     -  
Rwanda 6 0 0 0 0 0 0 0 0 0   -     -     -     -  
Senegal 14   -     -     -     -   0 0 0 0 0   -     -     -     -  
Sierra Leone 4 0 0 2 4 4 2 0 0 0   -     -     -     -  
Somalia 5   -     -     -     -   0 4 5 5 5 1   -     -     -  
South Africa 9 0 0 0 0 1 1 1 1 1   -     -     -     -  
South Sudan 3 3 3 3 3   -     -     -     -     -     -     -     -     -  
Sudan   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Swaziland   -     -     -     -     -     -     -     -     -     -     -     -     -     -  
Tanzania 26 26 26 26 26   -     -     -     -     -     -     -     -     -  
Togo 5   -     -     -     -   5 5 5 5 5 5 5 5   -  
Uganda 4 0 0 0 0 2 2 2 1 1   -     -     -     -  
Zambia 3 0 0 1 0   -     -     -     -     -     -     -     -     -  
Zimbabwe 8 1 1 1 4 4 4 4 2 8 7   -     -     -  
Total 241 41 42 46 50 54 56 55 54 60 44 15 14   -  

Larger Grain Borer: Is larger grain borer a problem?