Daylily rust research update

(presented at Nursery Growers' Short Course, Feb 12 2003, Royal Botanical Gardens, Burlington, Ontario)

Dr. Tom Hsiang, Dept. Environmental Biology, Univ Guelph

Leaf lesions

Leaf lesions

Leaf rust pustule

Rust pustule (large)

Rust pustule (larger)

Rust spores

Daylily rust

Research Personnel

Funding

Research objectives

Rust production

Cultivar resistance

Cultivar resistance (spots/leaf)

Catherine Woodbery

11.4 spots

Cherry Cheeks

8.7 spots

Pardon Me

8.5 spots

Fulva

6.9 spots

Cleopatra

4.6 spots

Rosy Returns

3.6 spots

Summer Wine

3.5 spots

Happy Returns

2.6 spots

Pandoraís Box

1.7 spots

Stella Díoro

0.5 spots

Greenhouse & outdoor test

Greenhouse treatments

Trade name

Chemical name

product/L water

product /100 gal

1. Banner 130EC

14.3% propiconazole

0.67 ml

8 fl oz

2. Daconil 2787F

40% chlorothalonil

2.5 mL

30 fl oz

3. Daconil Ultrex

82.5% chlorothalonil

1.7 g

1.4 lb

4. Fore 80WP

80% mancozeb

0.83 g

1.5 lb

5. Heritage 50WG

50% azoxystrobin

0.3 g

2 - 4 oz

6. Nova 40W

40% myclobutanil

0.3 g

4 oz

7. dishwashing liquid

Ultra Dawn

1%

1%

8. untreated control

water

only water

only water

 

 

Fungicide application

Rust inoculation (1 day after)

Bagged for 24 hours

Greenhouse test results

Greenhouse test results

Lab tests with leaves

Figure: fungicide 1 day before inoculation

Figure: fungicide 1 day after inoculation

Figure: fungicide 3 days after inoculation

Figure: fungicide 7 days after inoculation

Other research