نتایج جستجو برای: dieback
تعداد نتایج: 1295 فیلتر نتایج به سال:
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Ash dieback is a devastating fungal disease of ash trees that has swept across Europe and recently reached the UK. This emergent pathogen has received little study in the past and its effect threatens to overwhelm the ash population. In response to this we have produced some initial genomics datasets and taken the unusual step of releasing them to the scientific community for analysis without f...
— Many species of gall wasp (Cynipidae) essentially co-exist with their host oak tree species. Occasionally, the association becomes destructive to the tree, as is the case with Zapatella davisae, new species. This species is a twig galler, and as such, in the cases of heavy infestation, cause flagging, leaf clumping, and dieback of branches and twigs. Historical records of other species of Zap...
I report on a documented dieback in spicebush, Lindera benzoin, after the winter of 1993-1994 in two mature deciduous forest stands in southwestern Ohio. The study compares differences between 67 ha Hueston Woods and 5.2 ha Kramer Woods and examines spatial patterns of decline in Kramer Woods. Local daily minimum temperatures in January 1994 were among the coldest on record since 1889The shrub ...
The impact of plant defenses on insect herbivores is widely accepted, but their relative effects on oviposition choice, survival, and larval growth in preventing pest damage, especially for invasive insects, is not fully understood. Here, we examined the potential for plant defenses to reduce the economic and environmental impacts of an invasive herbivore, the viburnum leaf beetle, VLB (Pyrrhal...
In 2010–2018, Northern Patagonia featured the longest severe drought of last millennium. This extreme dry spell triggered widespread growth decline and forest dieback. Nonetheless, roles played by two major mechanisms driving dieback, hydraulic failure carbon starvation, are still not clear understudied in this seasonally region. Here, for 1800–2017 period, we apply a retrospective analysis rad...
An epidemic of ash dieback disease has spread east to west across Europe, first being noted in Poland in 1992 [1]. The disease is caused by the ascomycete fungus Hymenoscyphus fraxineus (also previously known as Chalara fraxinea and H. pseudoalbidus). This is one of several tree pathogens and insect pests that are recent newcomers to Europe caused by worldwide movements of plants and woody mate...
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