FUNGICIDES-国外杀菌剂简介.ppt

FUNGICIDES
FUNGICIDES
Fungicides kill or inhibit fungi
Inhibit growth and reproduction
Fungistatic
Not all fungicides are curative
Some only preventative
CONTACT FUNGICIDES
Active on leaf surface
Inhibit fungal growth
Control for 7 to 14 days
Rapidly degrade
Light, MO, and exposure
CONTACT FUNGICIDES
Was mon fungicides
Re-registration cost
Less expensive
Broad range of control
Less resistance
Multiple MOA
Leaf spot diseases
RANT FUNGICIDES
Enter plant tissue
Provide longer protection than contacts at lower rates
As long as 21 to 28 days
RANT FUNGICIDES
Types of rants
Localized, little or no movement in the plant
Translaminar moves across leaf blade
Mesostemic moves into cuticle and epidermis
RANT FUNGICIDES
Types of rants
Acropetal, upward translocation
Majority of rants are acropetal
RANT FUNGICIDES
Types of rants
Systemic, true systemic up and downward movement
Fosetyl-al (common name)
FUNGICIDE RESISTANCE
Selection of tolerant fungi by using the same class of chemical
Same mode of action (MOA)
Fungal pathogens that produce more spores more susceptible to developing resistance
Botrytis, powdery mildew, downy mildew, rust
Rotate fungicide classes
o codes
FUNGICIDE RESISTANCE
Contact prevent fungal growth by interrupting >2 growth processes
rants often interrupt only 1 process