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WALES, NEW YORK

last year my plants were attacked with a major case of powdery mildew...this year i started using daconil but have heard that you should alternate with another fungicide because the disease will build up a tolerence if only one is used...my question is what other fungicide should i alternate with the daconil?

6/28/2003 10:41:12 PM

Alex, IN

Cleary and Subdue are supposed to work great. What one doesn't take care of the other does.

Good Luck,
Mikkal

6/28/2003 11:41:19 PM

Ctpumpkin@optonline.net

Mancozeb is the least expensive alternate fungicide that works well. Comining a contact (Daconil & Mancozeb are cothe contacts) with a systemic (actually a local penetrant) will help too.

I'm using Mancozeb & Daconil for my two contacts in rotation. There used to be a lot more contacts. The Pro version of daconil has lost all labeling for residential use. Same for 26019 & Touche (Vinclozlin). That's too bad. These were very long lasting fungicides.

Now that things are getting ugly here in CT, I'm adding Eagle (aka Nova) as my systemic. Other examples of systemics are Bayleton, Benomyl, Banner, Prostar, Rubigan, etc. These are all known as the SI fungicides (as in "Sterol Inhibitting).

Watch Banner (Propoconizole) though. It has growth regulating properties that I only understand the effect of in turf & bedding plants. I will not use it here on Pumpkins until I better understand the effect on Pumpkins. At least around flowering anyway.

Allways read & understand all labels prior to use. Insure tank mix compatibility before use. Spray when cool af dusk when possible. Make rate selectuon based on real disease pressure & don't just reach for the bigger number because you want a bigger pumpkin. It doesn't work that way. US trade names differ from parts of Europe. Google for active ingredient names.

Steve

6/29/2003 10:19:13 AM

Ctpumpkin@optonline.net

Boy do I need to proof read for typing errors!

6/29/2003 12:29:15 PM

Joliet, IL

tremor, don't worry about the spelling errors, we don't
have red correction markers out. lol. the important thing
is the valuable info you provide for those on this site
including myself. thanx for all you effort. jeff

6/29/2003 9:27:25 PM

WALES, NEW YORK

thanks much....do you know of a good online distributor? i am located just se of buffalo, ny....the spring here was really cold and very wet....finally summer is starting to kick in...my plants are doing quite well and i am really trying to keep the squash bugs and mildew out....thanks for the info....good luck!!! brian

6/29/2003 9:36:12 PM

Caceres, mid west of Spain

Foliar seaweed is advised like a powedery mildew preventive.

6/30/2003 11:04:55 AM

Ctpumpkin@optonline.net

Hey Brian,

Shameless pulg alert!

Online I don't know. But we have a store (LESCO) just 2 towns west of you in Orchard Park. 4140 So. Taylor Rd. I just got off the phone with Joe. He & Jeff have stock of 12 lb bags of Dithane Mancozeb. About $55 I think.

Big package which might not be suitable? You only need 1 Tbsp per gallon or 1 lb per 100 gallons. So this bag makes 1200 gallons of spray. Enough for a few acres of pumpkins!

Anyway, they're good guys. Phone # 716-662-1818
They have lot's of good stuff for growers.

Best wishes.

Steve Jepsen in CT (with LESCO)

6/30/2003 12:56:40 PM

WALES, NEW YORK

hey tremor...you can't get much closer....i think i will get it...i'm sure the stuff will last awhile...i really appreciate the help...after my attack of the mildew last year, i really want to take any precautions possible.....also thanks don...i've been using liquid fish/seaweed since the early stages...maybe with a little luck and a little help from you guys i will make it past that 500# mark this year!

6/30/2003 9:40:21 PM

Lake Elmo, Minnesota

Whatever happened to Captan being one of two main rotating fungicides??

7/1/2003 4:55:03 PM

Ctpumpkin@optonline.net

Personally I've never been terribly impressed with spectrum (number of foliar diseases) of control from Captan. But I still have some here for stem crack issues that everyone on this site feel works so well. I must admit I've never used this treatment for cracks. In the past cracked pumpkins here just landed on the compost pile.

I seem to recall someone claiming Benomyl stayed on the cracks better than Captan without falling off. I have some of that too. Does anyone know if this is the case?

Steve

7/2/2003 10:15:24 PM

Ctpumpkin@optonline.net

Clarification.

Fungicide (or insecticide) selection should be made first based on efficacy toward the primary threatening fungal pathogen. In other words, not all fungicides perform equally well against all diseases. So if more than one disease has been historically present given the current & 10-14 day anticipated weather forecast, then all must be considered.

Then we determine if crop safety is adequate. Some fungicides are known to damage certain crops. Eliminate them from selection. Others cause moderate spray injury. Commercially we weigh the potential loss of yield from pest against the potential loss of yield from treatment.

Check state registration (commercial applicators primarily) since the label is the law. Toss the nonconformers.

Once a group of poor performers is eliminated from potential selection, the rest should be weighed for residual activity. Meaning actual days of control. There are fungicides that last 14-21 days for one disease on a given crop. But the same fungicide may only last for 3 days against another pathogen on the same crop. Use correct days control for primary threat. Then consider timing of occurence of secondary threats.

Then we take the price per treatment. Not the price per ounce or container or bag. The price per spray at the rate required to provide adequate control given the current & 10 day future anticipated environmental pressure. Consider real world apray interval frequency in days till next spray.

Divide the price per spray by the number of days of control that is anticipated.

Now we have the cost per day of control.

This is agronomy 101.

Steve

7/2/2003 10:31:12 PM

WALES, NEW YORK

i knew i should have taken a second semester of chemistry

7/4/2003 11:10:27 AM

Garden State Pumpkins

I also include safety issues with treatment. While I have captan I wouldn't want to spray it around in the wind...paste is made and applied....and residual dust is buried. read the label it is not nice! Chuck

7/4/2003 11:50:33 AM