农业植物病害IPM（英文）- (3).ppt

Introduction to integrated disease management
Introduction
Effects of control measures on disease progress
Effects of control measures within the plant tissue
Translocation and deposition of control measures
When to apply a control measure?
Concluding remarks
Plant life cycle
Seed germination
Seedling establishment
Vegetative growth
reproductive growth
Seed formation
Seed dissemination
survival
Pathogen life cycle
spore germination
establishment
lesion formation
reproductive growth
spore formation
spore dissemination
survival
Plant and pathogen life cycles
seed germination
seedling establishment
vegetative growth
reproductive growth
seed formation
seed dissemination
survival
epidemic
Monocyclic pathogens
Complete only one disease cycle in a growing season
(100 - y)
QR
dy
dt
Q = amount of initial inoculum
R = infection efficacy of the inoculum
y = disease intensity (%)
t = time
Time
Disease intensity (%)
Time
Disease intensity (logit)
QR
Logit = ln ( )
100
100-y
For monocyclic pathogens
All disease plants are infected from inoculum that survived from the previous season
Time
Disease intensity (%)
Previous season inoculum
The host is susceptible for a very short tine (smuts)
The infecting structures do not disseminate within the same growing season (soil-borne pathogens)
The environmental conditions are conducive for infection for a short time (scab)
The growth of the pathogen is very slow
Pathogens are monocyclic because:
Polycyclic pathogens
Complete several disease cycles in a growing season
r y
dy
dt
(100 - y)
r = apparent infection rate
y = disease intensity (%)
t = time
Time
Disease intensity (logit)
r
Logit = ln ( )
y
100-y
Time
Disease intensity (%)
For polycyclic pathogens
Time
Disease intensity (%)
Few plants are infected from inoculum that survived from the previous season
Previous season inoculum
current season inoculum
Most plants are infected from inoculum that was proliferated