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  • 1
    Electronic Resource
    Electronic Resource
    Host–parasite relations between cowpea and Alectra vogelii (2002)
    Oxford, UK : Blackwell Science Ltd
    Weed research 42 (2002), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Although the angiospermous parasitic weed Alectra vogelii is a major biotic constraint to cowpea production in Africa, there is little information on the host:parasite association between them. Accordingly, the dry matter production and partitioning in a cowpea:A. vogelii association was studied over the growth cycle. Cowpea was grown in pots containing 1350, 2700 or 4000 A. vogelii seeds kg−1 top soil and with uninfected controls. Alectra vogelii attachment on to cowpea roots was first detected 30 d after crop emergence, and the first shoots emerged 44 d after crop emergence. New A. vogelii attachments on to cowpea roots continued to be produced throughout the growth of the crop. Alectra vogelii infection did not decrease cowpea dry matter production, but it significantly altered dry matter partitioning by increasing the proportion of root dry matter. Alectra vogelii infection significantly reduced dry matter accumulation in cowpea pods. The loss of dry matter in cowpea pods was largely accounted for by dry matter gain in A. vogelii shoots. The data are discussed in relation to how A. vogelii and other parasitic plants influence dry matter partitioning in their hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3180.2002.00288.x
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  • 2
    Electronic Resource
    Electronic Resource
    Aspects of the growth and development of Cyperus rotundus under arable crop canopies: implications for integrated control (1999)
    Oxford UK : Blackwell Science Ltd
    Weed research 39 (1999), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Cyperus rotundus L. is one of the most difficult weeds to control worldwide. In Zimbabwe, it is an important weed in arable areas with high crop production potential. The effect of maize, cotton and groundnut canopies on the suppression of C. rotundus was investigated under field conditions over two growing seasons. Similarly, C. rotundus growth and development under a constant maize population planted in isometric and rectangular stands were also studied over one growing season. The capacity of C. rotundus to spread in the short term and its regenerative capacity were curtailed under maize compared with groundnut and cotton canopies. The same was also true under isometric maize stands compared with rectangular maize stands. Significant interactions between crop canopy and time of sampling for C. rotundus shoot counts, leaf area, rhizome length, tuber counts and tuber dry weight suggest the effectiveness of the maize canopy in suppressing the spread and regenerative capacity of C. rotundus early in the season. The implications of these results for the integrated control of C. rotundus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3180.1999.00169.x
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