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... The pitch canker pathogen Fusarium circinatum was first found to cause damage in nurseries and pine plantations in northern Spain in 2004. Since then, establishment of pine plantations in the region has decreased as a result of the prohibitions placed on planting Pinus spp. and Pseudotsuga menziesii in areas affected by the disease. However, although most pine species have been found to be suscept ...
... The antioxidant activity of Pinus pinaster seedlings originating from two contrasting maternal environments and inoculated with the fungal pathogen Fusarium circinatum was examined. The antioxidant activity related positively to the stem necrosis caused by the pathogen (p = 0.005), but this relationship differed significantly between maternal environments (p ≤ 0.002). Seedlings from mother trees g ...
... The pitch canker pathogen, Fusarium circinatum , has major impacts on production in pine nurseries and plantations in South Africa. Thus far, efforts to reduce local spread have focused on rouging of infected pines and sanitation to eliminate local sources of inoculum. Although the host range of F. circinatum was thought to be limited to pines and Douglas-fir, recent studies in California indicate ...
Fusarium circinatum; Pinus patula; clones; foresters; forests; greenhouse experimentation; greenhouses; open pollination; pathogens; screening; seedlings; seeds; trees; South Africa
Abstract:
... Since the first appearance of Fusarium circinatum in South Africa in 1990, foresters have been challenged with poor field survival of Pinus patula seedlings at establishment. One of the best long-term solutions is to improve the genetic tolerance of P. patula to infection by the pathogen. Currently, large numbers of families are routinely screened for their tolerance to F. circinatum by infecting ...
... The primary symptoms associated with Fusarium circinatum infection in pine seedling nurseries are root and collar rot, shoot and tip die-back and seedling mortality. Management of this pathogen in nurseries usually involves the integration of various strategies relating to sanitation, insect control and fungicide treatment. The overall goal of this study was to use quantitative real-time PCR (qPCR ...
... During the last 20 years a program to develop and commercialize the Pinus patula × Pinus tecunumanii hybrid, as a replacement for P. patula, has been successfully implemented. The first crosses were initiated during the early 1990s and lead to establishment of field trials across a wide variety of sites. This work gained further impetus when it became apparent that Fusarium circinatum, was causing ...
... KEY MESSAGE : The heritability of genetic resistance of radiata pine against Fusarium circinatum was not clear. We demonstrated that there are at least 3 QTLs that could be involved in this resistance/susceptibility. A genetic linkage map was developed for Pinus radiata, using Amplified Fragment Length Polymorphism (AFLP), Inter-Simple Sequence Repeat (ISSR), Selective Amplification of Microsatell ...
Fusarium circinatum; Pinus patula; forestry; forests; fungi; inoculum; mortality; pathogens; plant establishment; seedlings; water stress; South Africa
Abstract:
... Fusarium circinatum is an important fungal pathogen of Pinus species. In South Africa, it is the most significant pathogen of Pinus patula seedlings in forestry nurseries where it presents a substantial constraint to productivity and can continue to cause mortality in-field for up to two years after establishment. This study describes the results from two trials where P. patula seedlings were inoc ...
plantations; Pinus; amplified fragment length polymorphism; reproduction; Fusarium circinatum; seedlings; disease control; trees; pathogens; fungi; South Africa
Abstract:
... Fusarium circinatum causes pitch canker of Pinus species in many parts of the world. The fungus was first recorded in South Africa in 1990 as a pathogen of P. patula seedlings and emerged later as a pathogen of established plantation trees, especially P. radiata in the Western Cape Province (WCP). In this study the population biology of F. circinatum in the WCP was explored. The aim was to determi ...
Fusarium circinatum; Pinus patula; breeding; crops; forests; fungi; genetic variation; greenhouses; hygiene; mortality; open pollination; screening; seedlings; trees; South Africa; United States
Abstract:
... The pine pitch canker fungus, Fusarium circinatum , has caused large-scale mortality of Pinus patula Schiede & Deppe ex Schltdl. & Cham. crops in South African nurseries. This disease is now managed with strict hygiene practices and mortality in commercial nurseries has been drastically reduced. During the last 10 years, however, the disease started to manifest in the field, impacting on post-plan ...
... KEY MESSAGE : Carbohydrate differences in offspring as a consequence of maternal effects explain transgenerational tree-pathogen interactions. The expression of disease is increasingly recognised as being influenced by maternal effects, given that environmental conditions experienced by mother trees affect tolerance in offspring. It is hypothesised that plant carbohydrates could mediate transgener ...
Fusarium circinatum; Pinus patula; Pinus tecunumanii; bags; bark; forests; growing media; hybrids; hydroponics; mortality; pathogens; sand; vegetative propagation; South Africa
Abstract:
... In response to the Fusarium circinatum pine pathogen threat in southern Africa, research has been conducted on the development of F. circinatum- tolerant P. patula and P. patula hybrids. The objective of this study was to investigate the propagation potential of these taxa in two vegetative propagation systems, hydroponic sand beds and polythene bags with composted pine bark growing medium. Signif ...
Fusarium circinatum; Pinus patula; containers; control methods; crops; discoloration; forests; hygiene; inoculum; mortality; open pollination; pathogens; planting; root systems; sanitation; screening; seedling growth; seedlings; steam; Southern Africa
Abstract:
... Fusarium circinatum is a pathogen causing serious post-planting mortality of Pinus patula seedlings in southern Africa. Containerised planting stock that is asymptomatic but associated with F. circinatum in the nursery is thought to be the cause of this problem. The aim of this study was to determine if re-use of seedling containers could be a source of inoculum resulting in asymptomatic planting ...
... Fusarium circinatum Nirenberg & O’Donnell (teleomorph = Gibberella circinata) is the causal agent of pitch canker disease of pines. Since 2004 it has been present in Europe, particularly in northern Spain, affecting P. radiata and P. pinaster in plantations and nurseries. The disease has now also spread to other European countries, including France, Italy and Portugal. In this report, we describe ...