EPWS 310 - PLANT PATHOLOGY
Contents of Lecture
Pages 414 - 2427
Continue Phytophthora Root Rots
Chile root rot.
These fungi are able to infect most parts of the root system (cf. Pythium) and can grow along the root and up to the crown and stem. Control depends on resistance, good water management, rotation and careful chemical control (resistance).
Many Phytophthora species cause diseases of the lower stem of many woody hosts. such as nut trees, Citrus, avacado and forest trees. This causes decline dieback and death, P. cinnamomi, P. citrophthora (on citrus).
Injection of Phosphorous Acid (Fosetyl Al) and Metalaxyl have been very successful.
Many Phytophthora species have deciduous sporangia are moved by wind, P. infestans.
Rain splash and wind spreads sporangia and these diseases can be VERY serious.
P. infestans. Disease Cycle Figure 11-29