Bacterial Diseases of Tomato: 2012

Bacterial Diseases of Tomato: 2012

Bacterial diseases of tomato 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 speck of tomato

Bacterial speck of tomato

Bacterial diseases of tomato Bacterial speck Bacterial spot-causes lesions on leaves, stems and fruit. Favored by warm (75-86 F), wet weather. Bacterial canker Bacterial leaf spot of pumpkincaused 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

Usually, bacterial spot will not spread from tomato to pepper or from pepper to tomato. Bacterial spot of pepper?

Bacterial spot of Pepper

Bacterial diseases of tomato Bacterial speck Bacterial spot Bacterial canker Management similar

Bacterial spot of tomato 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-host resistance 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 pepper-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 tomato-greenhouse 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-field 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- New products 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 diseases of tomato Bacterial speck Bacterial spot Bacterial canker-causes plant wilt, marginal leaf necrosis and fruit lesions.

bacterial canker

bacterial canker on transplant Photo-Mary Hausbeck

bacterial canker

bacterial canker

Bacterial canker of tomato

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 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 90 80 70 60 50 40 30 20 10 0 Charme d Solid Gold Data: Jim Jasinski et al. OSU

EFFECT OF ANTIBACTERIAL PRODUCTS ON BACTERIAL SPOT OF PUMPKIN OSU: Jim Jasinski 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

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