EPWS 310 - PLANT PATHOLOGY
Contents
of Lecture
Order
Peronosporales:
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).
3) PHYTOPHTHORA FOOT AND CROWN ROTS
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.
4) PHYTOPHTHORA LEAF AND STEM/FRUIT BLIGHTS
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