نتایج جستجو برای: forest nurseries
تعداد نتایج: 109754 فیلتر نتایج به سال:
Recent national guidelines call for improved nutrition within early years settings. The aim of this cross-sectional study was to describe foods and beverages served in nurseries, assess provider behaviors related to feeding, and compare these practices to national guidelines. We administered a mailed survey to a random sample of nurseries across England, stratifying by tertile of deprivation. A...
Monitoring surveys of Phytophthora related diseases in four forest nurseries Italy revealed the occurrence fourteen species to be associated with collar and root rot on plants typical Mediterranean alpine regions. In addition, a multilocus phylogeny analysis based nuclear ITS ß-tubulin mitochondrial cox1 sequences, as well micromorphological features, supported description new belonging phyloge...
This paper examines fungal succession among ectomycorrhiza-forming fungi by reviewing several studies. The first group of studies confirmed that common nursery fungi were replaced by other species over time. The second series of experiments showed that the root system underwent a succession of fungi as the stand aged. Fungi were apparently associated with certain parts of the root system: the y...
Weiland, J. E. 2014. Pythium species and isolate diversity influence inhibition by the biological control agent Streptomyces lydicus. Plant Dis. 98:653-659. Disease control of soilborne pathogens by biological control agents (BCAs) is often inconsistent under field conditions. This inconsistency may be partly influenced by pathogen diversity if there is a differential response among pathogen sp...
Crop rotation and fallow are management options that can be used to control plant parasitic nematodes in forest tree nurseries. Before these options can be put into practice, it is important to determine the host range and survivability under fallow of the parasitic nematode to be controlled. The results of host range tests on a needle nematode (Longidorus spp.) and a stunt nematode (Tylenchorh...
The risk of introducing the important plant pathogen Phytophthora ramorum outside of its present natural range is of extreme concern; however, the detection of P. ramorum in U.S. nurseries is increasing. The USDA has confirmed the presence of P. ramorum in nurseries in 21 states that received plants from an infested, southern California nursery and others. This nursery produces approximately 15...
Adequate concentration, exposure time and distribution uniformity of activated fumigant gases are prerequisites for successful soil fumigation. Field experiments were conducted to evaluate gas phase distributions of methyl isothiocyanate (MITC) and chloropicrin (CP) in two forest-tree nurseries. Concentrations of MITC and CP in soil air were measured from replicated microplots that received daz...
verhead irrigation is the most common form of irrigation in forest and conservation nurseries (Landis and others 1989) and in greenhouse production overall (Leskovar 1998). Overhead irrigation systems are generally less expensive to install, and have the advantage of preventing the accumulation of fertilizer salts that can be detrimental to plant growth (Argo and Biernbaum 1995). A significant ...
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