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