Difference between revisions of "Prostephanus truncatus"
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[[File:Prostephanus_truncatus_PaDIL135593a.jpg|250px|thumb|''Prostephanus truncatus'' - mounted adult (click on image to enlarge it)<br/>Author(s): Willow Warren, Department of Agriculture Western Australia<br/>Source: [http://www.padil.gov.au/pests-and-diseases/Pest/Main/135593 PaDIL]]] | [[File:Prostephanus_truncatus_PaDIL135593a.jpg|250px|thumb|''Prostephanus truncatus'' - mounted adult (click on image to enlarge it)<br/>Author(s): Willow Warren, Department of Agriculture Western Australia<br/>Source: [http://www.padil.gov.au/pests-and-diseases/Pest/Main/135593 PaDIL]]] | ||
| − | <font color="#800000">'''''Prostephanus truncatus'''''</font> (Horn) - larger grain borer | + | <font color="#800000">'''''Prostephanus truncatus'''''</font> (Horn, 1878) - (larger grain borer) |
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| + | The beetle is native to Central America where it is a sporadic pest of stored maize. It was introduced into Africa in the 1970's and developed quickly into a major pest of stored maize and cassava in sub-Saharan countries. It was first recorded from East Africa in 1981 (Tanzania) and from West Africa in 1984 (Togo). | ||
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| + | Losses of up to or exceeding 30% have been reported after 6 months of storage of maize and cassava. Infestations may already start on mature cobs in the field and can then be introduced into stores after harvest. Adults can fly over short distances but most dispersal occurs through human transport of grain and ''P. truncatus'' can be occasionally found in maize shipments. | ||
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| + | The female lays eggs into maize seeds and plugs the opening. The larva develops inside the kernel and the development from egg to mature adult lasts around 1 month. Several larvae can complete their development in a single grain. ''P. truncatus'' is adapted to a dry environment and can still survive in maize grains with 10% moisture. | ||
{{VN | {{VN | ||
| + | |de=grosser Kornbohrer | ||
|en=larger grain borer | |en=larger grain borer | ||
| − | | | + | |es=barrenador grande de los graneros |
|fr=grand capucin du maïs | |fr=grand capucin du maïs | ||
}} | }} | ||
| + | Management involves storage of maize under cool and dry conditions, as well as fumigation. For small-scale maize production, harvesting as soon as cobs are mature is recommended, as well as careful cleaning of stores, burning of infested residues and avoiding long storage periods. | ||
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| + | The histerid predatory beetle ''[[Teretrius nigrescens (predator)|Teretrius nigrescens]]'' has been introduced from Central America into Africa in the 1990s. After the establishment and spread of the predator a decrease in ''P. truncatus'' infestations was observed in some areas. | ||
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| + | The adult is dark brown and approximately 3-4 mm large. The pronotum is curved in front and the head directed downwards. The antenna has 10 segments, including a 3-segmented terminal club. | ||
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| + | For a review see [[Integrated Pest Management Reviews (2002) 7, 67-84|Farrell and Schulten, 2002]]. | ||
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<gallery widths=200px caption="Other images of Prostephanus truncatus (PaDIL - click to enlarge)"> | <gallery widths=200px caption="Other images of Prostephanus truncatus (PaDIL - click to enlarge)"> | ||
Latest revision as of 11:11, 29 June 2022
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Author(s): Willow Warren, Department of Agriculture Western Australia
Source: PaDIL
Prostephanus truncatus (Horn, 1878) - (larger grain borer)
The beetle is native to Central America where it is a sporadic pest of stored maize. It was introduced into Africa in the 1970's and developed quickly into a major pest of stored maize and cassava in sub-Saharan countries. It was first recorded from East Africa in 1981 (Tanzania) and from West Africa in 1984 (Togo).
Losses of up to or exceeding 30% have been reported after 6 months of storage of maize and cassava. Infestations may already start on mature cobs in the field and can then be introduced into stores after harvest. Adults can fly over short distances but most dispersal occurs through human transport of grain and P. truncatus can be occasionally found in maize shipments.
The female lays eggs into maize seeds and plugs the opening. The larva develops inside the kernel and the development from egg to mature adult lasts around 1 month. Several larvae can complete their development in a single grain. P. truncatus is adapted to a dry environment and can still survive in maize grains with 10% moisture.
| Vernacular names | |
|---|---|
| • Deutsch: | grosser Kornbohrer |
| • English: | larger grain borer |
| • Español: | barrenador grande de los graneros |
| • Français: | grand capucin du maïs |
Management involves storage of maize under cool and dry conditions, as well as fumigation. For small-scale maize production, harvesting as soon as cobs are mature is recommended, as well as careful cleaning of stores, burning of infested residues and avoiding long storage periods.
The histerid predatory beetle Teretrius nigrescens has been introduced from Central America into Africa in the 1990s. After the establishment and spread of the predator a decrease in P. truncatus infestations was observed in some areas.
The adult is dark brown and approximately 3-4 mm large. The pronotum is curved in front and the head directed downwards. The antenna has 10 segments, including a 3-segmented terminal club.
For a review see Farrell and Schulten, 2002.
- Other images of Prostephanus truncatus (PaDIL - click to enlarge)
details of head
details of head
antenna
pronotum
posterior end
