The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel
The hypothesis that HCN in cassava is a defence mechanism against arthropod pests is suggestive, but quality and quantity of empirical data is unsatisfactory and scarce. The burrowing bug (Cyrtomenus bergi Froeschner: Cydnidae: Hemiptera) is recorded as a major pest on cassava in the neo-tropics sin...
| Autores principales: | , , |
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| Formato: | Conference Paper |
| Lenguaje: | Inglés |
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International Center for Tropical Agriculture
1995
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| Acceso en línea: | https://hdl.handle.net/10568/55839 |
| _version_ | 1855521796832362496 |
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| author | Riis, L Bellotti, Anthony C. Vargas H., Octavio |
| author_browse | Bellotti, Anthony C. Riis, L Vargas H., Octavio |
| author_facet | Riis, L Bellotti, Anthony C. Vargas H., Octavio |
| author_sort | Riis, L |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The hypothesis that HCN in cassava is a defence mechanism against arthropod pests is suggestive, but quality and quantity of empirical data is unsatisfactory and scarce. The burrowing bug (Cyrtomenus bergi Froeschner: Cydnidae: Hemiptera) is recorded as a major pest on cassava in the neo-tropics since 1980. Most major cassava pests are leaf feeders whereas C.bergi feeds on cassava roots, introducing soil-borne pathogens which cause rot lesions on the parenchyma. It is a serious pest on cassava in Colombia and Panama. Whereas most major cassava pests are specialists that have co-evolved with cassava and feed readily on leaves with high HCN content, C.bergi is polyphagous feeding on many food crops as well as weeds. As a generalist that has not co-evolved with cyanogenic host plants, it can serve as a model in the study of HCN levels in cassava roots on non-specialists. Root damage caused by C.bergi was evaluated on 125 cultivars from the cassava CIAT core collection and compared to HCN level in root parenchyma and peel. Severe damage did not occur on clones with high HCN level in the parenchyma and approximately 400 ppm (fresh root parenchyma) was the upper limit to C. bergi feeding. Nevertheless many low HCN clones had low levels of damage indicating other possible mechanisms responsible for resistance to C. bergi in low HCN clones. These mechanisms should be investigated. High HCN levels in the root peel, however, did not prevent pest attack, indicating that high HCN content in the root peel will not protect against sucking pests and may have little affect on feeding pests |
| format | Conference Paper |
| id | CGSpace55839 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1995 |
| publishDateRange | 1995 |
| publishDateSort | 1995 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace558392024-01-09T09:48:26Z The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel Riis, L Bellotti, Anthony C. Vargas H., Octavio manihot esculenta cyrtomenus bergi pest control cyanides roots peel control de plagas cianuros raíces piel (vegetal) The hypothesis that HCN in cassava is a defence mechanism against arthropod pests is suggestive, but quality and quantity of empirical data is unsatisfactory and scarce. The burrowing bug (Cyrtomenus bergi Froeschner: Cydnidae: Hemiptera) is recorded as a major pest on cassava in the neo-tropics since 1980. Most major cassava pests are leaf feeders whereas C.bergi feeds on cassava roots, introducing soil-borne pathogens which cause rot lesions on the parenchyma. It is a serious pest on cassava in Colombia and Panama. Whereas most major cassava pests are specialists that have co-evolved with cassava and feed readily on leaves with high HCN content, C.bergi is polyphagous feeding on many food crops as well as weeds. As a generalist that has not co-evolved with cyanogenic host plants, it can serve as a model in the study of HCN levels in cassava roots on non-specialists. Root damage caused by C.bergi was evaluated on 125 cultivars from the cassava CIAT core collection and compared to HCN level in root parenchyma and peel. Severe damage did not occur on clones with high HCN level in the parenchyma and approximately 400 ppm (fresh root parenchyma) was the upper limit to C. bergi feeding. Nevertheless many low HCN clones had low levels of damage indicating other possible mechanisms responsible for resistance to C. bergi in low HCN clones. These mechanisms should be investigated. High HCN levels in the root peel, however, did not prevent pest attack, indicating that high HCN content in the root peel will not protect against sucking pests and may have little affect on feeding pests 1995 2015-01-28T14:21:52Z 2015-01-28T14:21:52Z Conference Paper https://hdl.handle.net/10568/55839 en Open Access International Center for Tropical Agriculture Riis, Lisbeth; Bellotti, Anthony C.; Vargas H., Octavio. 1995. The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel. In: International Scientific Meeting (2, 1984, Bogor, Indonesia). The Cassava Biotechnology Network: Proceedings. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. v. 2, p. 501-509. (Working document no. 150) |
| spellingShingle | manihot esculenta cyrtomenus bergi pest control cyanides roots peel control de plagas cianuros raíces piel (vegetal) Riis, L Bellotti, Anthony C. Vargas H., Octavio The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title | The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title_full | The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title_fullStr | The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title_full_unstemmed | The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title_short | The response of polyphagous pest (Cyrtomenus bergi Froeschner) to cassava cultivars with variable HCN content in root parenchyma and peel |
| title_sort | response of polyphagous pest cyrtomenus bergi froeschner to cassava cultivars with variable hcn content in root parenchyma and peel |
| topic | manihot esculenta cyrtomenus bergi pest control cyanides roots peel control de plagas cianuros raíces piel (vegetal) |
| url | https://hdl.handle.net/10568/55839 |
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