In June 2015, bleeding cankers were observed on the main stem of black oaks (Quercus velutina) also damaged by the from gall wasp, Zapatella davisae (Hymenoptera: Cynipidae) in Barnstable County, Massachusetts, USA. The sapwood underneath bleeding cankers was darkly discoloured and contrasted...

Appropriate management of invasive fungi requires adequate understanding of their global diversities and movement histories. The fungus Leptographium procerum is associated with root-colonizing forest insects in pine forests throughout the world, and may have contributed to the aggressive behaviour ...

Invasive wood borers vectoring pathogenic fungi have nearly exterminated several North American tree species, and it is unclear whether landscape dominant trees, such as pines, will face similar threats in the future. This paper explores the economic impacts of a hypothetical arrival of a...

Papers are presented focusing on biological control agents and how they are regulated across the EPPO region, how their use can be facilitated and how they may contribute to slowing the spread of invasive pests and mitigating the damage they cause. Three papers deal with Dryocosmus kuriphilus, a...

The exotic redbay ambrosia beetle, Xyleborus glabratus Eichhoff, has become a serious invasive pest in the USA, now established in eight southeastern states. Females are the primary vectors of a fungal pathogen, Raffaelea lauricola, that causes laurel wilt, a lethal disease of trees in the family...

Pitch canker, caused by the pathogen Fusarium circinatum, is a serious disease of pines, Pinus species. It is a threat to natural and planted pine forests, and to date it has invaded countries across five continents. Pine-feeding insects can play a key role in the epidemiology of the disease, as...

The pinewood nematode (PWN), Bursaphelenchus xylophilus, is the causal agent of pine wilt disease. This species has been reported from the United States of America and Asia associated with important forestry tree species, including pine, spruce, fir, larch and other conifers. However, in Europe,...

The five-spined bark beetle, Ips grandicollis, is an exotic pest in Australia that preferentially attacks stressed pine trees, including Pinus radiata D. Don, but it can also attack healthy trees. The beetle has been present in Australia for 70 years, feeding principally on logging debris, with...

In September 2013, a 6-m-tall bay laurel (Laurus nobilis) in Gainesville, Florida, USA, exbibited wilted leaves, discolored sapwood and ambrosia beetle (Xyleborus glabratus) entrance holes. In addition, the tree was growing close to an avocado that succumbed to the disease months earlier. Diseased...

The pine sawyer beetle Monochamus galloprovincialis is one of the main vectors of the pathogenic pine wood nematode Bursaphelenchus xylophilus, the causal agent of pine wilt disease. Although the nematode is absent from northern Africa, the vector M. galloprovincialis has been previously reported...