I have a fungus among us

Leaf streak

The information I have indicates that the appropriate fungicides should be used when it is moist. My New Mexico garden may not be moist until 2021.

Can I replace its being moist with having overhead watering?

This is a small row of hems, six or eight plants. If this would work, how much and how long should I water?

These (of course) are some of my best hems. I can no longer afford to dig them, buy new, and plant somewhere else.

Any help will be excepted with gratitude.

Charley

Sorry Charley, but your post doesn't make any sense. Can you tell us something more and add some photos?

If my only clue is "leaf Streak", by response is be "virus."

Leaf streak in daylilies, moved to the Daylily Forum.

I'm not sure I follow, is it the label on the fungicide that says that? The AHS Daylily Dictionary page on leaf streak has a link to fungicides for leaf streak. If you can tell us which of these (or another) you want to use it would help:

https://daylilies.org/daylily-...

Are you sure your information doesn't just mean to apply fungicides in anticipation of humidity/damp/wet weather (which is when fungal diseases tend to proliferate)?

From the University of Wisconsin Extension Division;

"If you grow daylily varieties that suffer from severe leaf streak every year, consider applying fungicides containing chlorothalonil, mancozeb or thiophanate-methyl to prevent the disease. Use fungicides only during periods of wet weather."

My concern is the definition of "periods of wet weather." Is a period of wet weather a couple of days of high humidity or is it a couple of weeks of intermittent showers?

This is one of my milder cases



This is some foliage I removed from more severe cases yesterday;



Here in New Mexico we don't typically have periods of wet weather as most might imagine. Last year our wet weather came to under 8 inches rain and snow for the year. Sue, we don't anticipate wet weather even if NOAA gives us an eighty percent chance, which they seldom do.

Would wet weather include saturation watering beneath the plants?

I haven't chosen a specific fungicide and was really looking for advice.

Thanks again to all who help.

Charley

The idea is that either leaf wetness allows the fungus to infect the plant (which is typical for most plant fungal diseases) and/or rain splashes spores from one leaf to another. Rain and overhead irrigation can obviously do this, but high humidity can also cause leaf wetness. That's why good plant spacing is important so that the leaves can dry quickly with better air circulation. Also drip irrigation is better than sprinklers because it keeps the leaves drier, and not overhead irrigating late in the day or at night is best because then the leaves dry quicker.

There are two links at the bottom of the AHS page I gave above, one is an overview of the disease and the second one is a link that shows which fungicides tested most effective.

The leaf streak fungus is reported also to need a wound such as from weather (e.g. hail) or insects before it can enter the plant so that's something you might also want to look at. If you don't get much natural rainfall is there a chance the plants are suffering from drought, or do you water them?

In New Mexico I have always watered usually once a week at least until our pump starts to pump sand.. Our humidity tends to range in the low teens and the perpetual westerlies dry out the soil rapidly.

Last year we were in extreme drought conditions for the entire growing season. We do get short hailstorms at some point every year.

Charley

I think some years leaf streak is worse here than rust, leaf miner problems are not far behind. Charley I went to that exact site, and it totally had me confused. It said to treat before leaf streak became a problem, and to continue as long as you had wet weather, and not to water overhead. I was wondering if it should be treated with a spray on the leaves or a drench into the soil?
I was at Lowe's today and was looking at fungicides used for lawns. I recognized two chemicals: A 10 lb. bag of BioAdvanced for $16.97, had Propiconazole as the active ingredient. A 10 lb. bag of Scotts Disease EX lawn treatment had Azoxystrobin as the active ingredient. The active ingredients were at a very low percentage of the total product. I was wondering if these two products could be used on daylilies? Would they help with leafstreak and with rust? How and at what rate would they be applied to be helpful? The same as a lawn?

Propiconazole and azoxystrobin are used for daylily rust and were both also tested in the leaf streak research I linked to above. The table for the latter does not give the active ingredients, only the product names. Propiconazole would be Banner MAXX and azoxystrobin was tested as Heritage. One would have to calculate how the dosage compared with what is typically recommended for daylily rust. Both those fungicides have been tested in several studies for daylily rust, published both by the AHS in the Daylily Journal and in other research papers available online. Azoxystrobin was found effective as a soil drench (for daylily rust). They were not the most effective for leaf steak in the study linked to from the AHS Daylily Dictionary link above. To be legal one should use a fungicide that is appropriately labeled for daylilies, which the lawn fungicides presumably are not, but both those active ingredients are available in other products.

http://hyg.ipm.illinois.edu/pa...