downy mildew on lettuce- manage or kill?

plantslayer(8)July 22, 2012

Hello,

I recently identified that a disease that has been appearing on some lettuce in my garden plot is downy mildew. I have a small plot and stuff is spaced a bit tight, also there is not a lot of room to rotate crops from one year to the next.

Anyway, I was wondering if I should just manage the disease by picking off bad leaves and so on, or if I need to kill all the plants that are having this problem.

The thing is, even if I kept my entire plot clean of the stuff, I garden in a large community garden, and the ratio of active diligent gardeners to moldy weed farmers is about 1 to 4 here. So even if I get rid of all the mildew I am pretty sure that mildew from someone else's plot would easily blow over onto mine.

Still, I have a lot of other healthy productive crops (kale, beans, tomatoes various other brassics) that don't have this mildew on them yet, so if it's a danger to them, I guess I'd rather kill the lettuce and spare everything else.

Another limitation is, I have to use organic methods in this place (garden rules, not mine) and I don't think that there are any recognized effective organic methods for dealing with DM.

So, is there any way to manage this stuff, should I just live with it, or should I eradicate all traces from the plot? At what point does it become a threat to other plants in my plot, or other plots?

Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

Guidelines from Univ of CA
http://www.ipm.ucdavis.edu/PMG/r441100411.html

Start by thinning out your plants. Perhaps harvesting every other plant, then share with friends.

Here is a link that might be useful: Guidelines from Univ of CA

    Bookmark   July 22, 2012 at 2:36PM
Thank you for reporting this comment. Undo
plantslayer(8)

Thanks for the advice there, it's pretty informative. I think that most of the lettuce in my plot is pretty well-spaced, but I might re-consider the spacing and ventilation.

One thing I was wondering, if the disease is not systemic (yet), and I keep pulling old and infected leaves off might I be able to more or less get rid of the disease? All of the lettuce I have is leaf-type, and it's actually Yu Mai Tsai aka sword-leaf lettuce, so it's more loose than most varieties.

    Bookmark   July 22, 2012 at 4:28PM
Sign Up to comment
More Discussions
I really messed up, who can help? Tomato expert needed...
I planted beefsteak and July 4th tomatoes and didn't...
dwyerkg
Annual Fall Horseradish Project
Here is a photo journal of my annual fall horseradish...
soilent_green
Sweet potato slips have white crystals on lower leaves...is that bad?
I bought multiple sweet potatoes from the store to...
armbarangel
pepper plant problem
I've had Oedema on some of my plants for a couple weeks....
Ryan Shea
Unforecasted late frost
I'm pretty much a newbie. I transplanted a yellow...
Katie Gooding
Sponsored Products
Jazzy� Rectangular: 5 Ft. 4 In. x 7 Ft. 8 In. Kid Essentials - Teen Area Rug
$255.95 | Bellacor
Dream Form 10-inch Cal King-size Gel Memory Foam Mattress
Overstock.com
Eastman Full Headboard
$799.00 | Horchow
Fiberbuilt 9-ft. Palm Tree Fiber Teak Market Umbrella Multicolor - 9PPP-4692
Hayneedle
Indoor Area Rug: Royal Green 7' 9" x 10' 6"
Home Depot
Modiss | Zinnia 1C39 Pendant Light
YLighting
Indoor Area Rug: Metro Blue 7' 9" Round
Home Depot
By the Tealights Candleholder in Gray
$43.99 | Dot & Bo
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™