synthesis and antifungal activity of two novel spermidine analogues.two spermidine analogues were synthesised and examined for antifungal activity. both compounds used as 1 mm post-inoculation sprays reduced infection of barley seedlings by the powdery mildew fungus, erysiphe graminis f.sp. hordei, infection of broad bean seedlings by the rust fungus, uromyces viciae-fabae, and infection of apple seedlings by the powdery mildew fungus, podosphaera leucotricha. since these fungal pathogens cannot be cultured axenically, the effects of the two spermidine analogues ...19979066105
use of fungicides against powdery mildew during an artificial scab inoculation test in an apple breeding programme focused on partial resistance.our project aimed to develop an effective selection methodology for partial disease resistance. one of its objectives was to define the optimal selection threshold for discarding individual seedlings after artificial scab inoculation tests. working with large populations of seedlings, it was necessary to conduct the scab tests at intervals throughout the season, with the risk of powdery mildew infection of the young plantlets during the summer. because podosphaera leucotricha symptoms prevent br ...200516637179
temporal isolation explains host-related genetic differentiation in a group of widespread mycoparasitic fungi.understanding the mechanisms responsible for divergence and specialization of pathogens on different hosts is of fundamental importance, especially in the context of the emergence of new diseases via host shifts. temporal isolation has been reported in a few plants and parasites, but is probably one of the least studied speciation processes. we studied whether temporal isolation could be responsible for the maintenance of genetic differentiation among sympatric populations of ampelomyces, widesp ...201121261766
influence of supplementary lighting during artificial scab inoculation tests in an apple breeding programm focused on partial 1988, the department of biological control and plant genetic resources at the walloon agricultural research centre started an apple-breeding programme using local genetic resources and modern varieties. our objective is to create high quality commercial cultivars with durable resistance to scab (venturia inaequalis), powdery mildew (podosphaera leucotricha) and canker (nectria galligena). the breeding strategy is based on crossing old apple cultivars and landraces selected as parents for low ...200617390863
ampelomyces mycoparasites from apple powdery mildew identified as a distinct group based on single-stranded conformation polymorphism analysis of the rdna its region.pycnidial fungi belonging to the genus ampelomyces are the most common natural antagonists of powdery mildews worldwide. during a study of the interactions between apple powdery mildew (podosphaera leucotricha) and ampelomyces mycoparasites, 52 new ampelomyces isolates were obtained from p. leucotricha and, in addition, 13 new isolates from other species of the erysiphaceae in four european countries. their genetic diversity was screened using single-stranded conformation polymorphism (sscp) ana ...200515912930
evaluation of hydrophobic and hydrophilic kaolin particle films for peach crop, arthropod and disease management.hydrophobic and/or hydrophilic kaolin particle film treatments to peach (prunus persica (l) batsch) trees were evaluated for crop and pest management capabilities in six studies from 1997 to 2000. unsprayed control and standard treatments, the latter consisting of a commercial pesticide program, were included for comparison. treatments in initial studies were applied via handgun, which resulted in a uniform and heavy deposit of kaolin after the first application. in contrast, treatments in subse ...200515593071
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