Daylilies forum: Spring Sickness

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Views: 7017, Replies: 45 » Jump to the end
Name: Greg Bogard
Winston-Salem, NC (Zone 7a)
Jun 29, 2019 5:59 PM CST
I used to get quite a bit of SS each year until someone told me to spray the plants each Fall, just before the first freeze, with a systemic insecticide. That was to control Spring infestations of thrips and aphids. After I added that to my Fall regime, SS went down dramatically. Last Fall, due to health issues, I did not do my Fall insecticide spraying. This Spring was the worst for SS, aphids, and thrips in a Long Time. I will definitely spray this Fall!
I spray three times at five to six day intervals in early October. Our annual first freeze is Oct 14. If you want to know yours:
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Jun 29, 2019 6:32 PM CST
Has anyone thought to do tests for plant virus on plants that have this problem?

Not that I recall, it doesn't really fit the pattern for a virus. The leaf streak fungus, Aureobasidium microstictum, has been isolated from several samples of spring sickness, and has reproduced something like it when injected into the plants. But the question then is how does it get into the plants naturally, which is why we think there is likely a pest involved.

Greg, what systemic did you use? Have you tried treating half the garden and not the other half and then counting affected fans in both?
Name: Maurice
Grey County, Ontario (Zone 4b)
Jul 2, 2019 6:31 AM CST
Spring sickness can kill daylilies. We have to separate the effect of spring sickness on daylily clumps from its effect on daylily fans (individual daylily plants). Although it may affect a number of fans in a clump, depending on the number of fans in the clump it may not kill the clump. When we look at each individual fan it can and does kill some of the fans it affects.

Spring sickness may also prevent fans from flowering. Again, we have to separate its effect on clumps of fans versus its effect on each single fan (daylily plant). Depending on how severely a fan is affected, if it does not die, a fan can be so severely set back by spring sickness that it does not flower in the same year. If it is mildly affected by spring sickness and it recovers well it may still flower but we do not know whether in those cases it flowers as it would have if it had been unaffected by spring sickness - I expect that it does not flower as well as it would have. A clump with many fans may have some affected by spring sickness but the clump may still be able to flower well because of fans that were unaffected.
[Last edited by admmad - Jul 2, 2019 9:21 AM (+)]
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Name: Elena
NYC (Zone 7a)
Daylilies Spiders! Plant and/or Seed Trader Winter Sowing Hybridizer Peonies
Garden Procrastinator Container Gardener Composter Organic Gardener Seed Starter Vegetable Grower
Jul 3, 2019 4:27 AM CST
This year Little Showoff had two fans that were severely impacted by Spring Sickness. Both fans recovered somewhat. Both also sent up a scape that looked like it was coming up out of the soil. Both scapes were only about two inches tall. One scape had one bud and the other had two buds. A normal fan sent up a normal scape which is the normal height and has many buds.

I was shocked when those two little scapes appeared because I've never had fans look that bad and still manage to put up a scape.
Name: Marcia
Rochester, ny, zone 6 (Zone 6b)
Dragonflies Dog Lover
Jul 3, 2019 8:13 AM CST
I have a couple plants that always seem to get spring sickness every year. One is Daveo Holman. Hasn't bloomed very much as a consequence. It has not spread to the 3 plants next to it. Think I will try Greg's systemic insecticide in the fall. Any special one you use? I have Bayer rose & flower. Think It is a fert, insecticide, fungicide combo. Maybe the fertilizer part wouldn't be good that late in the season?
Name: Elena
NYC (Zone 7a)
Daylilies Spiders! Plant and/or Seed Trader Winter Sowing Hybridizer Peonies
Garden Procrastinator Container Gardener Composter Organic Gardener Seed Starter Vegetable Grower
Jul 3, 2019 8:53 AM CST
I was just outside and the normal scape of Little Showoff bloomed. Here are pictures of the short scapes and the normal one for comparison.

Thumb of 2019-07-03/bxncbx/8d9bef
Way down in the foliage.

Thumb of 2019-07-03/bxncbx/b820be
4-way branching.

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