A network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests.
PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
June 2005. Palau reported the death of two trees, Macaranga carolinensis and Terminalia catappa. Both trees show the same sign: brown-black decay progressing from the base up the trunk. This was followed in the case of M carolinensis by wilting, then death of leaves. The tree appears to be dead. The T catappa does not show symptoms yet, but the decay has progressed about 1 meter up the trunk. One exposed roots of the M carolinensis shows similar progress ofthe disease. Three nearby M carolinensis trees show no signs of disease, and other nearby trees are also unaffected.
An infected Delonix regia from Guam was sent for comparison (lower, right).
It is also not an easy disease to control as the fungus lives in the soil and spreads by root-to-root contact. There is some interesting work done by a Taiwanese group on control of Phellinus using calcium carbonate and urea.