Bacterial Diseases of Tomato: 2012
• Bacterial speck • Bacterial spot • Bacterial canker
Bacterial diseases of tomato
• Bacterial speck- causes lesions on leaves, stems and fruit. Prefers cool (64-75 F), wet weather
• Bacterial spot • Bacterial canker
Bacterial diseases of tomato
Bacterial speck of tomato
Bacterial speck of tomato
• Bacterial speck • Bacterial spot-causes lesions on leaves, stems and
fruit. Favored by warm (75-86 F), wet weather. • Bacterial canker
Bacterial diseases of tomato
Bacterial leaf spot of pumpkin- caused by a different microbe
Bacterial spot of Tomato
Bacterial spot of tomato
Bacterial spot of Tomato
Bacterial spot of tomato
Bacterial spot of tomato Rain checking
bacterial spot
Bacterial spot of pepper
?
Usually, bacterial spot will not spread from tomato to pepper or from pepper to tomato.
Bacterial spot of Pepper
• Bacterial speck • Bacterial spot • Bacterial canker
Bacterial diseases of tomato
Management similar
• Strains of the bacterial spot microbe resistance to fixed copper in Indiana
• Copper resistance in tomato & pepper strains • Both copper resistant & sensitive strains in any year
Bacterial spot of tomato
• Cultivars differ in susceptibility • Avoid past problems • Maynard, Egel and Zandstra Trials
• http://docs.lib.purdue.edu/fvtrials/10/ • http://docs.lib.purdue.edu/fvtrials/9/
Bacterial spot of tomato-Host resistance
• Host resistance to Races 1-5 • Grow cultivars with resistance to as many races as
possible. • In 2010, bact spot race 6 found in pepper
(no host resistance)
Bacterial spot of pepper-host resistance
• Purchase seed tested for disease • Good sanitation • Inspect seedlings • Apply copper/mancozeb (not for peppers) • Apply streptomycin…e.g., Agri-mycin 17
Bacterial spot of tomato-greenhouse
• Fall tillage • Crop rotation • Avoid leaf wetness • Fixed copper/mancozeb-5-10 day schedule • Actigard (0.33 oz/A)…30-50 gal water/A
• increase water volume with Actigard rate • 8 Actigard applications allowed per year.
Bacterial spot of Tomato-field
• Tanos 50DF-may help with bact diseases when applied for fungal diseases.
• Serenade Max-may help with copper resistance • Tank mix or alternate
• Agriphage-a disease of bact spot bacterium • Need to send in samples early in season • Marketed by OmniLytics
Bacterial spot of Tomato-’New’ products
• Bacterial speck • Bacterial spot • Bacterial canker-causes plant wilt, marginal leaf
necrosis and fruit lesions.
Bacterial diseases of tomato
bacterial canker
bacterial canker on transplant
Photo-Mary Hausbeck
bacterial canker
bacterial canker
Bacterial canker of tomato
• Purchase seed tested for bacterial canker • Sanitation-greenhouse & field • Inspect seedlings • Fall tillage/crop rotation • Avoid leaf wetness • Greenhouse copper/mancozeb • Tanos 50DF
Bacterial canker of tomato
Bacterial Diseases of Pumpkin: 2012
XANTHOMONAS BACTERIAL LEAF SPOT
OSU: Jim Jasinski
ANGULAR LEAF SPOT OF CUCURBITS
• Cucumber most susceptible but all cucurbits may be affected
• Favored by moderate temperatures and high moisture
OSU: Jim Jasinski
Bacterial spot pumpkin
Bacterial spot pumpkin
OSU PUMPKIN ALS/BACTERIAL SPOT TRAIL
• Two cultivars, susceptible ‘Charmed (A & C)’ & tolerant ‘Solid Gold (RU)’.
• Direct seeded 6 June in rolled winter rye. • Four replications • Inoculated with ALS strain. • ALS symptoms confirmed on leaves, but only bacterial
spot symptoms observed on fruit. • Labeled products applied: Actigard, Kocide 3000,
Serenade Max, Oxidate. (9 app’s, 27 June-2 Sept) • Non-labeled product applied: Kasumin 2L • Products applied 7 day intervals.
OSU: Jim Jasinski
RESISTANCE TO BACTERIAL SPOT-PUMPKIN
0
10
20
30
40
50
60
70
80
90
Charmed
Solid Gold
Data: Jim Jasinski et al. OSU
EFFECT OF ANTIBACTERIAL PRODUCTS ON BACTERIAL SPOT OF PUMPKIN
Incidence refers to % infection (Y or N) found in the plot (all fruit examined) Severity refers to % infection found on 10 fruit randomly sampled per plot 9 weekly applications from June 27 to September 2 Data provided by Jim Jasinski, OSU
OSU: Jim Jasinski
BACTERIAL SPOT/ALS OF PUMPKIN MANAGEMENT
• Avoid problem cultivars • Fall tillage/crop rotation • Monitor seed source • Greenhouse/field santiation • Fixed copper applications/mancozeb • Consider Actigard applications
BACTERIAL SPOT OF PUMPKINS
• Apply fixed copper products • At onset of symptoms • When fruit softball sized • Every 7-14 days • With Dithane or Manzate
NEW PRODUCT FOR PUMPKINS
• Actigard 50 WG • Diseases labeled for include:
• Downy mildew • Powdery mildew • Bacterial spot
ACTIGARD 50 WG
• Induce plant defenses • Actigard-avoid stressed plants (yield drag) • Actigard is not in Purdue recommendations