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  • Heliotropium europaeum  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Axenic culture and influence of wetness period and inoculum concentration on infection and development of cercospora blight ofHeliotropium europaeum (1995)
    Springer
    European journal of plant pathology 101 (1995), S. 491-496 
    Details
    ISSN: 1573-8469
    Keywords: biological control of weeds ; biology ; Cercospora heliotropii-bocconii ; common heliotrope ; Heliotropium europaeum ; wetness period
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Cercospora heliotropii-bocconii is a fungal pathogen of the ephemeral annual weedHeliotropium europaeum. The effects of wetness period and inoculum concentration on disease severity were studied under controlled conditions. The fungus was grown on different artificial culture media and carrot juice agar with 5 g l−1 yeast extract was found to be the most suitable medium for conidial production under artificial conditions. Abundant disease symptoms only occurred after 8 h of wetness at 20°C. The minimum incubation period before disease symptoms appeared was 8 days following a wetness period of at least 40 h. Inoculum concentration of 1×104 conidia per ml killed plants in less than one month and reduced seed production by two thirds. These results suggest that this pathogen has the potential to reduce plant survival and seed bank replenishment of this annual weed species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01874472
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  • 2
    Electronic Resource
    Electronic Resource
    Host range ofPachycerus cordiger (=P. Scabrosus) (Col.: Curculionidae) (1993)
    Springer
    BioControl 38 (1993), S. 537-539 
    Details
    ISSN: 1573-8248
    Keywords: Life cycle ; host specificity ; Pachycerus cordiger ; Heliotropium europaeum ; Boraginaceae ; biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The univoltine weevilPachycerus cordiger Germar (=P. scabrosus Brullé) completes its life cycle on species of Boraginaceae, it is found from western Europe to the Middle East. In southern France, adultP. cordiger were collected feeding on the leaves ofHeliotropium europaeum L.,Echium vulgare L. andCynoglossum creticum Miller, whereas larvae were found feeding externally on the roots of the three plant species from within an earthen cell. BecauseP. cordiger is considered too much of a generalist to be released in Australia, work on the weevil as a potential biological control agent ofH. europaeum has been stopped.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373088
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    Paper (German National Licenses)
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