INTRO TO PLANT PATHOLOGY - University of Florida

PLANT
DISEASE
CONTROL

DISEASE
TRIANGLE

Host

Pathogen Environment

STRATEGIES FOR DISEASE
MANAGEMENT:

1. Crop resistance
2. Cultural methods
3. Physical methods
4. Pesticides

Ø CROP RESISTANCE

-TERMS-

9 Immunity

(I = Total absence of disease)

9 Resistance

(R = Selected cultivars are visibly less
diseased than susceptible standard)

9 Tolerance

(T = Diseased but still vigorous or
better yielding)

TALL RUST RESISTANT MIXED COLORS Better Boy Hybrid VFN

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Where is disease
resistance mentioned

on these packets?

CUCUMBER

POINSETT

Dark green fruit, plants with good resistance to downy
mildew, powdery mildew, anthracnose and angular leaf
spot. Ready to pick in 65 days after planting.

PLANT in average, well-drained soil after all danger of
frost C spring to early summer. For "hill" culture, space
4 to 6 seeds in groups 4 to 5 feet apart. Cover with 2
inch of fine soil, tamp lightly, keep surface evenly moist.
Or sow seeds 3 to 6 inches apart in rows

How many diseases are
these resistant to?

Ù CULTURAL METHODS

9 Sanitation

9 Crop rotation
9 Host eradication
9 Improvement of crop

environment

What
control
method
is used
here?

Are these seedlings healthy?

What cultural method is
used here?

Is there a problem here?

Growing tomatoes with drip
irrigation is an example of which
disease management strategy?

Ú PHYSICAL METHODS

Tall sugarcane provides
windbreak for peppers

Û PESTICIDES

Chemicals should be used
as a last resort.

Classes of treatments:

1. Soil treatments
2. Seed treatments
3. Foliar sprays

Soil Treatments:

9 Fumigation*
9 Fungicides
9 Soil Solarization

*Fumigation: Vapam - a soil fumigant, is a restricted
pesticide. You must be certified to buy and apply it

SEED TREATMENTS

Inhibit Protect against
surface-borne soil-borne
pathogens
pathogens

Fungicides:

Inadequate Adequate

Recommended Rate

Fungicides:
Protectants not curatives

CORRECT TIMING

Soil solarization uses clear mulch to trap
solar radiation to heat soil to inactivate
pathogens and other pests

Where do
you go
for
help?