AHS Region 2/Great Lakes Newsletter
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thought to aid the spread of the disease, cutting is
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not always recommended, especially in the south.
Only if necessary to obtain clearance to sell plants
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Written by Joann Stewart and Paul Limmer
after an inspection has shown rust present, or
In early March, just before
cutting to thin foliage so chemical coverage is
the Cleveland Mid Winter
improved should cutting be done.
Symposium, Dan Hansen
If you want certain rust control, you must spray, and you
interviewed the larger
should closely match the sprayer and the farm/garden:
ichigan
Central Florida growers and
<1.4 acre   4 gallon backpack, hand pump/$80
collected empirical data on
>1/4 acre to one acre   20 gallon power pump, 100 ft
lden, M
rust management and control
hose / $500
in their gardens. All were in
ee A
agreement that although
1 to 5 acres   200 gallon power pump, 200 ft hose /
age: L
`daylily traders' and illegal
$1500 to $3000
plant shippers were unlikely
Most spray with pressure >150 pound per square inch.
to be controlled, the first
Individual preferences might be a stream spray to turn
igital imD
obligation of the big produc 
foliage, or a mist, but all should aim for greater than 80%
Dan Hansen
ers is to stop the movement
spray coverage to the point of drip.  During the growing
of rust from their gardens.
of Geneva, Florida
season in the south, the spray interval is between one and
Growers recognize that if
two weeks.  The preferred spraying techniques and equip 
one grower ships even one affected plant, it hurts every
ment are a legacy of rust treatment experience and hard 
other grower, so the unwritten policy is: 
Symptomatic
plants are not shipped
!
Some observations on rust were:
  
  
Growers recognize that if one grower ships
Different cultivars can show signs of rust at
even one affected plant, it hurts every other
different times of the year, which adds to the
grower, so the unwritten policy is: 
Symptom 
complexity of finding rust tolerant daylilies.
atic plants are not shipped
!
Breeding for `rust control' isn't realistic, as al 
Dan Hansen
though several lists of `rust prone' and `rust
tolerant' plants have been published, there is little
agreement between lists.
won, as daylily spraying was virtually unknown just two
years ago.
Ideal conditions for rust development include a
combination of water (> 5 hours wetted leaf) and
Chemical Controls:
heat (night time temperatures >60F).  No top end
Systemic (preventative and curative)
temperature has been seen in Florida, as tempera 
1. Heritage, Quatres, Abound, Compass
tures rarely exceed 95F, but overall, rust thrives in
2. Baleton 50, Strike
hot, humid conditions.
3. Bannermax, Tilt
It is thought that rust infections are slow to start
4. Contrast
and do not explode overnight, but optimum envi 
Contacts (preventative)
ronmental conditions and aided spore transporta 
1. Daconil, Manacure
tion increase the rate of spread.
2. Manazeb, Dithane, Fore, Protek
Many gardeners don't watch their foliage very
Most spray techniques mix systemics and contacts, and use
closely and mistakes are sometimes made in
a surfactant (spreader/sticker).  If using Daconil, a surfac 
identifying rust or rust is overlooked until infesta 
tant might not be needed.
tion is rampant.
If using anything else in the mix (fertilizer, pesticides,
Two years experience has shown that plants do not
miticides, antiseptics), read the instructions and test on a
die from rust, and chemical treatments are quickly
few plants weeks before overall spraying because mixing
successful, making it unnecessary to cull/destroy
can change or cause chemical reactions.
infected plants. Since even partial cutting is
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 Spring/Summer 2003

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