Lethal Cankers Caused by Phytophthora spp. in Almond Scions: Specific Etiology and Potential Inoculum Sources
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منابع مشابه
Sources of inoculum for Phytophthora ramorum in a redwood forest.
ABSTRACT Sources of inoculum were investigated for dominant hosts of Phytophthora ramorum in a redwood forest. Infected trunks, twigs, and/or leaves of bay laurel (Umbellularia californica), tanoak (Lithocarpus densiflorus), and redwood (Sequoia sempervirens) were tested in the laboratory for sporangia production. Sporangia occurred on all plant tissues with the highest percentage on bay laurel...
متن کاملThe Late Blight Pathogen, Phytophthora infestans Interaction with the Potato Plant and Inoculum Sources
The oomycete, Phytophthora infestans, is one of the most important plant pathogens worldwide. This thesis focuses on the late blight pathogen and its host, potato (Solanum tuberosum), and the interaction between these two organisms. Resistance to P. infestans was evaluated histologically, using leaves of potato cultivars with varying levels of general resistance. Preinfectional events could be ...
متن کاملHead Blight Gradients Caused by Gibberella zeae from Area Sources of Inoculum in Wheat Field Plots.
ABSTRACT The spread of Fusarium head blight of wheat from a small area inoculum source was examined in wheat plots (100, 625, or 2,500 m(2)) inoculated in the center with Gibberella zeae-colonized corn kernels or macro-conidia sprayed on heads at anthesis. With the first inoculation method, disease foci were produced from ascospores released from perithecia formed on inoculated kernels. With th...
متن کاملThe Effect of Wounding, Temperature, and Inoculum on the Development of Pink Rot of Potatoes Caused by Phytophthora erythroseptica
Pink rot, caused by Phytophthora erythroseptica Pethybr., is an important disease of potato (Solanum tuberosum L.) (20). The name of the disease describes a characteristic and diagnostic pink color that appears after infected tissue has been cut and exposed to air for 20 to 30 min (8,12,17). Other symptoms of pink rot include dark discoloration of the skin and lenticels of infected parts, purpl...
متن کاملSusceptibility to Phytophthora ramorum and Inoculum Production Potential of Some Common Eastern Forest Understory Plant Species
Phytophthora ramorum is a destructive pathogen of oak and tanoak in California and Oregon (10,31,33) and also causes disease symptoms on a large number of other plant species (7,15). Quarantines have been in place since 2001 to prevent the spread of P. ramorum from infested areas (1,28). A federal order went into effect on 10 January 2005 in response to detections of P. ramorum in California, O...
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ژورنال
عنوان ژورنال: Plant Disease
سال: 1999
ISSN: 0191-2917,1943-7692
DOI: 10.1094/pdis.1999.83.8.739