Copper or Daconil

jmsieglaff · June 26, 2016

Which fungicide would serve as the better preventative to apply after a good rainstorm? I had sprayed with Neem/soap/potassium bicarbonate a couple days ago but we got over an inch and half of rain last night. I had three plants with just a couple leaf spots which I removed and that's why I treated a couple days ago. Which would better to apply tonight or doesn't it matter?

clkeiper · June 26, 2016

just get something on... I don't think it matters, but we use both and then a few more... alternating so disease resistance doesn't happen... hopefully. Also use a spreader sticker for greater efficacy. it stays on the plant longer and therefore works longer. we use nufilm P or nufilm 17 depending on the crop. You have to read the label and see which you would need. Nufilm 17 has a much longer harvest interval. I am sure there are plenty others to use so just research them.

Cole_Robbie · June 26, 2016

use a spreader sticker for greater efficacy

Agreed. I've been using SM-90. It's $18 a quart, but I only use about a tablespoon per gallon of spray.

**carolyn137** · June 26, 2016

Quote:

Originally Posted by jmsieglaff

Which fungicide would serve as the better preventative to apply after a good rainstorm? I had sprayed with Neem/soap/potassium bicarbonate a couple days ago but we got over an inch and half of rain last night. I had three plants with just a couple leaf spots which I removed and that's why I treated a couple days ago. Which would better to apply tonight or doesn't it matter?

For me it would depend on whether you are trying to prevent the common fungal foliage diseases, in which case IMO Daconil is the best choice,or trying to prevent the common bacterial foliage diseases in which case IMO Copper would be best.

And if both the fungal and bacterial pathogens are a problem at the same time,then alternate between the two.

Carolyn, and consider Mancozeb to alternate with copper as well.

jmsieglaff · June 26, 2016

Thanks for the feedback everyone. I'll have to look into the sticky agents for the future. But for tonight I'll roll with Daconil since my leaf spot issues are almost always Septoria. It's been a dry summer so I'm doing well in that regard and I'd like to keep it that way.

June 26, 2016	#1
jmsieglaff Tomatovillian™ Join Date: Jan 2014 Location: Southern WI Posts: 2,742	Copper or Daconil Which fungicide would serve as the better preventative to apply after a good rainstorm? I had sprayed with Neem/soap/potassium bicarbonate a couple days ago but we got over an inch and half of rain last night. I had three plants with just a couple leaf spots which I removed and that's why I treated a couple days ago. Which would better to apply tonight or doesn't it matter?

June 26, 2016	#2
clkeiper Tomatovillian™ Join Date: Nov 2011 Location: ohio Posts: 4,350	just get something on... I don't think it matters, but we use both and then a few more... alternating so disease resistance doesn't happen... hopefully. Also use a spreader sticker for greater efficacy. it stays on the plant longer and therefore works longer. we use nufilm P or nufilm 17 depending on the crop. You have to read the label and see which you would need. Nufilm 17 has a much longer harvest interval. I am sure there are plenty others to use so just research them. __________________ carolyn k Last edited by clkeiper; June 26, 2016 at 01:32 PM.

June 26, 2016	#3
Cole_Robbie Tomatovillian™ Join Date: Jun 2012 Location: Illinois, zone 6 Posts: 8,407	use a spreader sticker for greater efficacy Agreed. I've been using SM-90. It's $18 a quart, but I only use about a tablespoon per gallon of spray.