Management of
Tomato and Pepper
Diseases
Mohammad Babadoost
University of Illinois
[email protected]
11 January 2017
Major Tomato and Pepper
Diseases in Illinois in 2016
 Tomato




Abiotic disorders
Bacterial spot
Septoria leaf blight
Sclerotinia blight
 Pepper
 Bacterial spot
 Phytophthora blight
Babadoost
Babadoost
Abiotic disorders of tomato
Bacterial Spot of Tomato
______________________________________
Pathogen: Xanthomonas
campestris pv. vesicatoria
 Occurrence: most prevalent
bacterial disease of tomato in
Illinois, especially in the south
 Damage: mainly foliage necrosis
Babadoost
Bacterial spot on tomato leaves
Babadoost
Bacterial spot on flower stems
Babadoost
Bacterial spot of tomato fruit
Babadoost
Bacterial spot of tomato fruit
Babadoost
Bacterial Spot of Tomatoes-2015, Vandalia
Treatment
Foliage Dis severity (%)
# Spray 25 Jul 28 Aug
Control (check)
0
5a
50 a
Phyton 27AG (40 oz/A)
8
2 bc
28 bc
Torino 0.85SC (3.4 fl oz/A)
8
1 bc
26 b-d
Mettle 125ME (8 fl oz/A)
8
2 bc
21 c-e
Mettle/Torino
8
2 bc
23 b-e
Rally (4 oz/A)/Quintec (6 fl oz/A) 8
2 bc
25 b-e
GWN-10126 SC (36 fl oz/A)
3b
20 c-e
GWN (30 fl oz/A)/Quintec (6 fl oz) 8
2 bc
25 b-e
Gavel 75 DF (2 lb/A)
3b
18 e
8
8
.
Septoria Blight /Bacterial Spot of Tomato 2015, Champaign, IL
Treatment
.
.
Foliage blight
# Spray
5 Sep (%)
Control (check)
.
0
79 a
/Dithane-M (2 lb)+Kocide (1.5 lb) 8
21 d
Quintec (6 fl oz)+Kocide (1.5 lb)
Quintec (6 fl oz)+Kocide (1.5 lb)
/Bravo W.S. (2 pt)+Kocide (1.5 lb) 8
13 d
Phyton 27AG (40 oz/A)
8
60 b
Mettle (8 fl oz)/Torino (3.4 fl oz)
8
25 d
GWN (32 fl oz/A)/Quintec (6 fl oz) 8
40 c
Bacterial Spot of Tomatoes-2016, Vandalia
Treatment
Foliage Dis Sev (%) 19 Aug
# Spray Mt. F. Dixie R.
Control (check)
0
4 a-c
15 a
Phyton Spectrum XP (40 oz/A)
8
4 a-c
9 ab
Dithane (2 lb) + Kocide-3000 (1.5 lb) 8
3 cd
21 cd
Quintec+Kocide /Dithane+Kocide
1d
2.5 d
Quadris+Kocide /Brav WS+Kocide 8
4 a-c
6.5 b-d
Kocide + Manzate Pro Stick (1.5 lb) 8
2.5 b-d 5.5 b-d
Regalia (32 fl oz) + Manzate Pro S. 8
4.5 ab 11 ab
Cueva (32 fl oz) + Double Nikel
6a
Reliant (64 fl oz)
8
8
8
5 ab
10.50 ab
8 b-d
.
Bacterial Spot of Tomatoes-2016, Vandalia
Treatment
Foliage Dis Sev (%) 17 Sep
# Spray Mt. F. Dixie R.
Control (check)
0
41 a
60 a
Phyton Spectrum XP (40 oz/A)
8
26 b-d 36 d-f
Dithane (2 lb) + Kocide-3000 (1.5 lb) 8
14 e
24 f
Quintec+Kocide /Dithane+Kocide
8
12.5 e
25 ef
Quadris+Kocide /Brav WS+Kocide 8
26 b-d
35 d-f
Kocide + Manzate Pro Stick (1.5 lb) 8
19 de
37.5 c-e
Regalia (32 fl oz) + Manzate Pro S. 8
22.5 c-e 36 d-f
Cueva (32 fl oz) + Double Nikel
8
27.5 b-d 38 cd
Reliant (64 fl oz)
8
35 ab
47.5 a-d
.
Septoria Blight /Bacterial Spot of Tomato 2016, Champaign, IL
Treatment
.
.
Foliage blight
# Spray 12 Sep (%)
.
0
81.25 a
8
20.00 b
8
15.00 b
alt Regalia + Manzate Pro Stivck (1.5 lb) 8
13.50 b
Control (check)
Quintec (6 fl oz) + Kocide (1.5 lb)
alt Dithane-M (2 lb) + Kocide (1.5 lb)
Quadris (6.2 fl oz) + Kocide (1.5 lb)
alt Bravo W.S. (2 pt) + Kocide (1.5 lb)
Regalia (32 fl oz) + Kocide (1.5 lb)
Management of Tomato Diseases
_______________________________________
 Major diseases:
Septoria leaf blight and
bacterial leaf spot
 Effective treatments:
Quintec (6 fl oz) + Kocide (1.5 lb)
Alt. Dithane-M (2 lb) + Kocide (1.5 lb)
OR
Quintec (6 fl oz) + Kocide (1.5 lb)
Alt. Bravo W. S. (2 pt) + Kocide (1.5 lb)
Septoria Leaf Blight of Tomato
______________________________________
 Fungal Diseases:
Septoria lycopersici
 Leaf infection, foliar blight
 Seed- and residue-borne disease
 Plant infection throughout the
season
 A devastating disease, Illinois
Babadoost
Septoria leaf spot & blight of tomato
Babadoost
Management of Septoria Blight
of Tomato
_____________________________________
 Cultural practices
 Plant pathogen-free seed
 Crop rotation: 3 years
 Remove debris after harvest
 Chemical control
 Quadris Alt. Chlorothalonil
Babadoost
Sclerotinia Blight (White Mold)
of Tomato
Babadoost
White Molds (Sclerotinia sclerotiorum)
Babadoost
White Molds (Sclerotinia sclerotiorum)
Babadoost
Babadoost
White Molds (Sclerotinia sclerotiorum)
A
Sclerotinia sclerotiorum
Babadoost
Sclerotinia Blight of Tomato
____________________________________
 Disease: a fungal disease
 Pathogen: Sclerotinia sclerotiorum
 Status: a soil-born pathogen
 Pathogen survival: as sclerotia
 Favorable conditions: wet
 Infection site: stem and flower
 Symptoms: water-soaked lesions
and plant blight, with sclerotia
Babadoost
Sclerotinia Blight of Tomato
.
 Management: is difficult (air-born &
soil-born inoculi, large host-range
 Cultural practices






Resistant cultivars not available
Dry soil surface
Sub-surface drip irrigation
Low plant densities
Stake plants
Remove infected plants
 Spray: Cabrio, Contans (a fungus),
Priaxor
Babadoost
Important Pepper Diseases, 2016
_______________________________________
 Bacterial spot
Xanthomonas campestris pv. vesicatoria
 Phytophthora blight
Phytophthora capsici
Babadoost
Bacterial spot of pepper
Bacterial spot of pepper
Management of Bacterial Spot of
Peppers
_____________________________________
 Use pathogen-free seed
 Plant certified disease-free transplants
 Crop rotation: at least 1 year
 Prevent water-splashing in greenhouse
 Copper, Actigard, Agri-mycin 17
(streptomycin), Tanos, and Serenade
Max have been registered for control
of this disease
Babadoost
Important Pepper Diseases, 2016
_______________________________________
 Phytophthora blight
Phytophthora capsici
Babadoost
Phytophthora blight of bell peppe
Babadoost
Phytophthora blight of pepper
Babadoost
Management of
Phytophthora Blight of Peppers
_________________________________
 Resistant cultivars
 Cultural practices
 Chemical control
Babadoost
Management of
Phytophthora Blight of Peppers
_________________________________
 Resistant cultivars:
Alliance
Aristotle
Emerald Isle
Enza
Intruder
Paladin
Reinger
Revolution
Babadoost
Management of
Phytophthora Blight of Peppers
_________________________________
 Cultural practices
 Grow plants on raised beds
 Crop rotation: ≥ 3 years
 Do not use contaminated water
Babadoost
Host Range of Phytophthora capsici
____________________________________________________
Host_________________ Non-Host________
.
Cantaloupe Cucumber Gourd
Corn
Eggplant
pepper
Beet
Broccoli Kale
Pumpkin
Squash
Radish
Crabgrass
Basil
Zucchini
Watermelon Turnip
Sandbur
Celery
Honeydew
Swiss-chard Carrot
Wheat Water hemp Barley
Spinach
Nightshade
Cocklebur Lamb’s-quarters
Onion
Pigweed Soybean
Cabbage
Chives
Dill
Green bean Lima bean Tomato
Mustard Cauliflower Parsley
Velvet-leaf
Kohlrabi Puncture vine
Snow pea
Tobacco
Babadoost
Management of
Phytophthora Blight of Peppers
_________________________________
 Chemical control
 Registered fungicide





Omega 500 F…………... 29
Presidio 4SC ………….. 43
Ranman ………………... 21
Revus …………………... 40
Ridomil Gold SL ……… 4
Drench at transplanting, then spray
weekly alternating fungicides
Babadoost
Thank You
Comments/ Questions