Second-stage larvae of Rehizonma sequoiae Cid del Prado Vera et al. tunnel through the cortex of the redwood Sequoia sempervirens (D. Don) Endl. root to the vascular tissue where each developing female induces a single ovoid or occasionally spherical giant cell with a single ovoid to spherical nucleus containing one to four enlarged nucleoli. Nematode tunnels are filled with a gel material and ...

Spontaneous ignition tests of various forest species were performed with a specifically designed apparatus. The forest species selected: Arbutus andrachne, Cistus incanus, Pinus brutia, Pinus halepensis, Cupressus sempervirens, Pistacia lentiscus, Abies cephalonica are very common in the Mediterranean region which is frequently devastated by forest fires. The same tests were performed in the pr...

Basal shoots produced by Arbutus unedo L. after cutting at ground level vary in size and growth rate, and are classified accordingly as dominant or suppressed. The suppressed shoots eventually cease growth and die. In this study, we investigated the role of light and water in the competition among shoots of A. unedo. Dominant and suppressed shoots of A. unedo showed similar leaf water potential...