Square Foot Gardening Forum

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.


Search
 
 

Display results as :
 

 


Rechercher Advanced Search

Latest topics
» Friday Rookie Topic X: Marigolds
by MeghanSTL Today at 9:12 pm

» How's the Weather Where You're At?
by donnainzone5 Today at 8:20 pm

» Feedback for my 2017 garden plan
by MeghanSTL Today at 7:28 pm

» How much to plant?
by camprn Today at 6:39 pm

» Winter Rye Grass
by camprn Today at 6:31 pm

» Winter Sowing vs. Winter Growing
by trolleydriver Today at 6:10 pm

» Turan in the Western Mountains
by Turan Today at 4:35 pm

» Crop Rotation Involving Nightshades
by Turan Today at 4:23 pm

» Show us your kitchen compost container
by Zmoore Today at 4:00 pm

» Sad News from Jimmy Cee
by Turan Today at 1:04 pm

» Happy Birthday!!
by trolleydriver Today at 12:58 pm

» Some of our recipes
by Cajun Cappy Today at 12:51 pm

» Hola from Southern Ecuador
by Cats Today at 11:51 am

» Cover Crops??
by camprn Today at 11:20 am

» Crop rotation
by camprn Today at 10:55 am

» CHALLENGE - Smallest possible footprint
by BeetlesPerSqFt Today at 10:03 am

» Anyone want walking onions??
by RoOsTeR Today at 7:43 am

» My rapini is scaring me
by Scorpio Rising Yesterday at 10:42 pm

» Creamy Basil Pesto
by MeghanSTL Yesterday at 10:35 pm

» CANADIAN REGION: What are you doing January 2017
by trolleydriver Yesterday at 9:49 pm

» who has chickens
by countrynaturals Yesterday at 9:05 pm

» Zera (TM) Food Recycler - kitchen composting
by Scorpio Rising Yesterday at 8:04 pm

» What are you eating from your garden today?
by sanderson Yesterday at 1:35 pm

» "Virtual" Roadtrip of the Desert and Old West
by countrynaturals Yesterday at 11:39 am

» Northern California & Coastal Valleys - What are you doing this month?
by countrynaturals Yesterday at 11:33 am

» What I learned this year
by countrynaturals Yesterday at 11:32 am

» Mustard recipe
by llama momma Yesterday at 8:24 am

» Weather Warning - Middle South
by MrBooker Yesterday at 8:18 am

» Gift Amaryllis
by Kelejan 1/14/2017, 1:44 pm

» My Shreveport Garden 2017
by Cajun Cappy 1/14/2017, 1:11 pm

Google

Search SFG Forum

Silverleaf on squash

View previous topic View next topic Go down

Silverleaf on squash

Post  1airdoc on 5/21/2012, 8:14 pm

I had been noticing the problem below on several leaves of my squash and zucchini(which I grew from seed). At first I suspected it was downy mildew and treated with sulfur, but on closer inspection, I found that the spots are not fuzzy and do not rub off.
Here's another view:
And a third

I had read other posts that said the silver color was normal, but on closer investigation, I found that it is caused by the silverleaf white fly. These tiny bugs are only 1/8 inch long and do not over winter in areas with freezing temperatures (of course, we had a very mild winter this year!). When their immature forms feed on the sap of the squash leaves, their saliva introduces toxins that cause the changes you see in the images above, which is caused by separation of the surface of the leaf from the lower layer. It can cause the plants to be stunted and have reduced fruit quality (pale fruit) and production.

You can find the flies by turning the leaf over and carefully inspecting the lower surfaces. I found several, but they were too small to photograph. Here's an image from online:

These look large, but when you compare them to the size of the leaf hairs beside them, you can appreciate their tiny size.

It only takes a small number of flies to cause the damage. I read that they are hard to control; insecticidal soaps are supposedly effective.

1airdoc

Male Posts : 188
Join date : 2011-05-04
Location : 7a (Northern middle Tennessee)

View user profile

Back to top Go down

Re: Silverleaf on squash

Post  crs on 5/21/2012, 9:52 pm

My zucchini leaves look like that too I was told it was normal. I will be checking tomorrow and try to get a handle on it. They are planted right next to my tomatoes, cucumbers, and cantaloupe and watermelon. I may have a bigger problem Thanks for that post.

crs

Posts : 65
Join date : 2012-05-05
Location : West Central MO

View user profile

Back to top Go down

update

Post  1airdoc on 5/26/2012, 5:03 am

I used spinosad (organic pesticide) on the underside of the squash and zucchini leaves and then a couple of days later sprayed sulfur under the leaves and when I checked yesterday I found only a very rare whitefly. All the leaves have the silver spots on them, but the spots don't seem to be enlarging.

1airdoc

Male Posts : 188
Join date : 2011-05-04
Location : 7a (Northern middle Tennessee)

View user profile

Back to top Go down

Re: Silverleaf on squash

Post  rod champion on 5/31/2012, 9:55 am

what is the damage is left alone?

rod champion

Male Posts : 125
Join date : 2011-12-21
Age : 67
Location : Piedmont NC

View user profile http://www.southholstonriverflyshop.com

Back to top Go down

Re: Silverleaf on squash

Post  1airdoc on 6/1/2012, 9:40 am

I have left the original damage alone (i.e., I haven't removed the leaves). The silver spots have not spread on the leaves where I originally noted them, and the leaves otherwise look healthy. I think that since I began treating the plants, the spots have decreased or not spread on new leaves, though. I still note an occasional white fly, but not many.

I opted to try to treat my plants since I read that the silver leaf can cause the plants to produce fewer and sometimes discolored fruit.

1airdoc

Male Posts : 188
Join date : 2011-05-04
Location : 7a (Northern middle Tennessee)

View user profile

Back to top Go down

Re: Silverleaf on squash

Post  Sponsored content Today at 9:44 pm


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum