ÜÜÜ°ÕÀL>vÀiÃÌÀÞ°V
THEM VULNERABLE TO DECAYCAUSING ORGANISMS %XCESS
SOIL WATER AIDS AND ENCOURAGES THE SPREAD OF INFEC
TION OF MAJOR SOILBORNE PATHOGENS SUCH AS !RMILLARIA
0HYTOPHTHORA AND 0YTHIUM !RMILLARIA SPREAD AND GROWTH
IS ENHANCED BY WATERLOGGING 0HYTOPHTHORA AND 0YTHIUM
SPECIES ARE ESPECIALLY ADAPTED TO ATTACK HOSTS UNDER
WATERLOGGED CONDITIONS HAVING SPORES WITH A FLAGELLA
TAIL THAT ALLOWS THEM TO SWIM THROUGH SATURATED SOIL
ATTRACTED TO STRESSRELATED SUBSTANCES RELEASED BY
STRESSED ROOTS 2ETREATING FLOOD WATERS CAN LEAVE SOIL
DEPOSITED AROUND THE ROOT COLLARS OF TREES LEAVING THEM
FURTHER DISPOSED TO SOILBORNE PATHOGENS
-ANAGEMENT 0RACTICES
!PPLICATION OF TREATMENTS DURING FLOODING POSES LOGISTI
CAL PROBLEMS AND CONSEQUENTLY HAS YET TO BE INVESTI
