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Tools for Combating Late Blight

List of Tables Below

Relative resistances of selected tomato cultivars to late blight
in a trial conducted by Pia Gavino in the Fry Lab (1995)

Cultivar

Disease Severity

West VA 63

404

Mt Supreme

500

Ultra Sweet

500

Jet Star

500

Pilgrim

520

Supersonic

520

New Yorker

560

Glamour

580

Market Pride

610

Pik Rite

660

Sunrise

685
Disease Severity is a cumulative metric,
in which a higher number = more severe disease

Relative resistances of several heirloom tomato cultivars
in trials conducted by Hilary Mayton in the Fry Lab.

Cultivar

% Disease

% Disease

 

2002

2006

Gold Nugget

100

100

Sunrise

90

77

Black Krim

48

23

Celebrity

49

5

Big Beef

50

63

Aunt Ruby's German Green

32

41

Brandywine

48

1

Red Currant

38

10

Yellow Pear

21

15

Aunt Ginny's Purple

36

11

Black Plum

15

16

Yellow Currant

25

4

Matt's Wild Cherry

0

0

Cultivar Resistance (Potatoes)

Cultivar
Resistance
Maturation Time
Adirondack Blue susceptible early
Adirondack Red susceptible early
All Blue susceptible late
All Red susceptible late
Allegany moderately susceptible late
Ambra (susceptible) early
Amey susceptible late
Andover susceptible early
Atlantic susceptible mid season
Austrian Crescent (susceptible) late
Bake King susceptible mid season
Banana susceptible late
Butte (susceptible) mid season
Caribe (susceptible) early
Carola (susceptible) mid season
Carrera (susceptible) early
Castile moderately susceptible mid season
Cherry Red susceptible (mid season)
Chieftain susceptible mid season
Chippewa susceptible early
Dorita moderately susceptible (mid season)
Elba moderately resistant late
Eramosa susceptible early
Eva susceptible mid season
Fabula (susceptible) early
French Fingerling (susceptible) mid season
Genesee susceptible late
German Butterball (susceptible) late
Goldrush susceptible (mid season)
Green Mountain moderately susceptible late
Hampton (susceptible) mid season
IdaRose (susceptible) mid season
Kanona (susceptible) mid season
Katahdin moderately susceptible late
Kennebec moderately resistant late
Keuka Gold susceptible mid season
Keystone Russet susceptible susceptible (mid season)
LaChipper (susceptible) (mid season)
LaRatte (susceptible) (susceptible) late
LaRouge (susceptible) (susceptible) mid season
Manona susceptible susceptible mid season
Marcy susceptible susceptible late
Monticella susceptible susceptible mid season
NorDonna susceptible susceptible mid season
Norkota susceptible susceptible (mid season)
Norland susceptible susceptible early
Norland (Dark Red) susceptible susceptible early
Norwis susceptible susceptible mid season
Pike susceptible susceptible mid season
Ranger Russet susceptible susceptible (mid season)
Reba susceptible susceptible mid season
Red Lasoda #10 susceptible susceptible mid season
Red Pontiac (susceptible) (susceptible) mid season
Reddale (susceptible) (susceptible) mid season
Redsen (susceptible) (susceptible) mid season
Rideau (susceptible) (susceptible) late
Rosa moderately susceptible (mid season)
Russet Burbank moderately susceptible late
Russet Gem susceptible (mid season)
Russet Norkotah susceptible mid season
Salem (susceptible) mid season
Satina (susceptible) mid season
Sebago moderately resistant late
Serran moderately resistant (mid season)
Shepod susceptible (mid season)
Snowden moderately susceptible late
Superior susceptible early
Winema (susceptible) mid season
Yukon Gold susceptible mid season

Relative efficacy of “alternative” late blight control agents
in replicated trials conducted by Hilary Mayton in the Fry Lab

Year

material

host

efficacy

1996

Harpin (Messenger)

potato

4%
 

Bravo WS

potato

93%
       

1997

B. subtilis

potato

7%
 

Harpin (Messenger)

potato

7%
 

Bravo WS

potato

99%
       

1998

metal SAR inducer

potato

0%
 

B. subtilis

potato

0%
 

Burkholdaria casidae

potato

0%
 

Bravo WS

potato

92%
       

1999

Neem oil

potato

0%
 

Bravo WS

potato

99%
       

2000

Lidochem

potato

0%
 

Bravo WS

potato

98%
       

2001

BABA

tomato

12-26%
 

Bravo WS

tomato

98%
       

2002

Actigard

tomato

11-30%
 

Bravo WS

tomato

90-95%
       
 

efficacy = reduction in disease severity relative to unsprayed control

Active ingredient in Bravo WS is chlorothalonil