The position and the structure of the mycangium (carrying microorganisms) of Dendroctonus armandi Tsai et Li, the most destructive bark beetle in Qinling and Bashan Mountains were studied. The results showed that the mycangia of the adult D. armandi consisted of the pronotal intergumentary cavities ...

In late 1994, bushfires in the Beerburrum area north of Brisbane, in Queensland, Australia, damaged 8688 ha of pine plantations (mostly Pinus elliottii, P. caribaea and P. taeda). In the 4712 ha of government-owned plantations affected, large-scale salvage operations were commenced quickly in order ...

Douglas fir (Pseudotsuga menziesii), west of the Oregon Cascades, and ponderosa pine (Pinus ponderosa), east of the Cascades, were cut during autumn 1993 or 1995 in conjunction with silvicultural and harvesting practices. Trees cut varied in size and age, and the stumps were exposed to disparate...

Arthropods (including Lepidoptera, Coleoptera and Hemiptera) were collected from flowering dogwoods (Cornus florida) infected with Discula destructiva, the causal agent of dogwood anthracnose, to evaluate their ability to transport viable conidia. During 1994, 7.2% of all arthropods collected...

The occurrence of Dutch elm disease in Italy is described. Infection is now very high in Calabria and Sicily and temporarily low in central and northern parts of Italy. As no significant changes in the causal fungus (Ophiostoma novo-ulmi) are foreseen, it is suggested that Dutch elm disease will...

Pine pitch canker caused by Fusarium subglutinans f.sp. pini [Gibberella fujikuroi var. subglutinans] is a serious disease of many species of pine and has severely affected Pinus radiata in California since its discovery in 1986. The fungus, together with its bark beetle vectors, causes dieback,...

Recent evidence has shown that the native Taiwan red pine (Pinus taiwanensis), once believed to be a pine species resistant to the pinewood nematode Bursaphelenchus xylophilus, is subject to attack. Because the pine sawyer, Monochamus alternatus, has been confirmed as the major vector of the...

A modified immunocapture reverse transcription polymerase chain reaction (RT-PCR) to detect CLRV in forest trees is described. The application of a conserved primer pair was shown to be suitable for the detection of different isolates of CLRV from birch from distant forest stands in Germany and...

In September and November 1994, wildfires caused damage to 9 thousand hectares of slash pine (Pinus elliottii var. elliottii) in plantations near Beerburrum, SE Queensland. During the salvage operation sapstain and decay were monitored by periodically felling and sectioning trees in five plots in...

Angsana wilt disease (caused by F. oxysporum) affecting P. indicus in Singapore was first reported in Malacca in 1870. Following several outbreaks in various parts of the Peninsular Malaysia, the disease was recorded in Singapore in 1914, and by 1919 many P. indicus trees in Singapore had either...