Daconil (applications per yr.)

[Yak54]

Just curious if anyone knows what the reason most sources of daconil mention max. no. of applications per yr. or sometimes max no. of tsps. or tblsps. per year. With all the rain we been having, I going to have a hard time staying within these guidelines and wondered what the consequences might be.
Thanks.

Dan

[clkeiper]

You can use other fungicides, too. We stick to the label as much as possible. Copper, mancozeb, neemoil, oxidate... are some to just mention off the top of my head, but you could also use a spreader sticker to make the fungicide more effective for a longer period of time. Nufilm 17 keeps the active ingredient effective longer because it keeps it on the plant longer. We buy it from Yoders produce in fredericksburg, ohio. read the label and apply as directed. The PHI is about 2 weeks depending on the concentration of fungicide you are using, so you wouldn't want to spray it one day and pick in a few days if you are spraying the highest concentration possible.

[ginger2778]

Caution with Mancozeb and Maneb, suit up! That stuff has been proven to cause severe birth defects in migrant worker offspring.

[FLRedHeart]

Originally Posted by Yak54

Just curious if anyone knows what the reason most sources of daconil mention max. no. of applications per yr. or sometimes max no. of tsps. or tblsps. per year.

Hi Dan,

The specific reason you ask for is a voluntary concession made by the manufacturers of Daconil so the product would be re-registered with certainty by the EPA. The EPA's concern is that over a certain amount will increase the chance of some active daconil being deposited in surface water systems where it is highly toxic to aquatic organisms. The total amount is simply a safety valve for users that might go overboard and cause an ecological problem.

But when you ask about consequences, there are others closer to home. Such high application rates will promote the development of resistant pests. So alternating with copper. There are differences in effectiveness depending on the pest and you'll really be doing yourself a favor besides complying with the environmental concerns.

[Lee]

Daconil is a fungicide.... not a pesticide....

[FLRedHeart]

Originally Posted by Lee

Daconil is a fungicide.... not a pesticide....

ROFL! It would be more accurate to say you or we "use it only as a fungicide", assuming you have never used it to control bacterial spot, etc. if the semantics don't sound right to your ear. When dealing with environmental issues, the full spectrum of action of the pesticide is always considered.

"Chlorothalonil acts primarily as a fungicide and mildewicide, but also has
some activity as a bactericide, microbiocide, algaecide, insecticide, and
acaricide. It is a broad spectrum, non-systemic pesticide. Its exact mechanism
of action is not known."

reference: EPA 1999 pesticide re-application form for chlorothalonil (Daconil TM), as well as EPA fact sheet chlorothalonil

[Yak54]

Originally Posted by FLRedHeart

Hi Dan,

The specific reason you ask for is a voluntary concession made by the manufacturers of Daconil so the product would be re-registered with certainty by the EPA. The EPA's concern is that over a certain amount will increase the chance of some active daconil being deposited in surface water systems where it is highly toxic to aquatic organisms. The total amount is simply a safety valve for users that might go overboard and cause an ecological problem.

But when you ask about consequences, there are others closer to home. Such high application rates will promote the development of resistant pests. So alternating with copper. There are differences in effectiveness depending on the pest and you'll really be doing yourself a favor besides complying with the environmental concerns.

Thank you for your info. I think I better understand the situation now. I knew of the toxicity to aquatic organisms, and I do have a pond close by, but wasn't sure as to why the application limit of 7 applications per year. I'm already at 5 as of June 30th, and I have been alternating with copper spray, so depending on how much more rain we have, I may go over 7 applications this season.

[amideutch]

Last time I checked Daconil (Chlorothalonil) is a contact fungicide that remains on the outside of the plant and protects the plant from new infection and nothing more. If your plant is already infected applying Daconil will do nothing as it does not have curative activity and new growth is not protected.

But from what I have read there is different flavors of Daconil now that have additives that will add different modes of action depending on the additive.

Ami

[FLRedHeart]

Originally Posted by Yak54

Thank you for your info. I think I better understand the situation now. I knew of the toxicity to aquatic organisms, and I do have a pond close by, but wasn't sure as to why the application limit of 7 applications per year. I'm already at 5 as of June 30th, and I have been alternating with copper spray, so depending on how much more rain we have, I may go over 7 applications this season.

Glad that helped. To put it in perspective, Daconil was at one time widely applied to residential lawns and turfs without restriction. Concern for aquatic organisms in places like ponds, and contact with playing toddlers before it dried on lawns, as well as lawn service employees spraying it as a main part of their job, caused the additional restriction and got into the re-registration at the EPA, which ended up on our labels with those limits.. Bordeaux mixture (and perhaps other copper-based fungicides) adheres better in rains for what it's worth.

[Yak54]

I appreciate your input !

Dan

[b54red]

If you use Daconil regularly down here you would be hard pressed to only use it 7 times in a year since our growing season is so long and heavy rains so frequent most summers. Unless you just use it once a month or if your plants all die within 8 to 10 weeks which is possible. As to its being a pesticide I have seen no evidence that it bother either pests or friendly insects at all. If it does act as any kind of insecticide then it is far less effective than a mild soapy water spray which does show some effect on insects that are very small like aphids. My garden is again full of Assassin bugs so I have already doused them with copper and Daconil multiple times and they only seem to grow stronger with each application thank goodness. They really do a wonderful job of eliminating most pests during the summer months. Thankfully my pesticide use this year has been limited to one application of BT for worms early in May and none since then because of the high number of Assassin bugs.

Bill

[FLRedHeart]

Originally Posted by b54red

As to its being a pesticide I have seen no evidence that it bother either pests or friendly insects at all. If it does act as any kind of insecticide then it is far less effective than a mild soapy water spray which does show some effect on insects that are very small like aphids. Bill

Hi Bill,

reference from the government, by law: http://www.epa.gov/pesticides/about/index.htm
(FAQ)

"What is a pesticide? A pesticide is any substance or mixture of substances intended for:

• preventing,
• destroying,
• repelling, or
• mitigating any pest.

Though often misunderstood to refer only to insecticides, the term pesticide also applies to herbicides, fungicides, and various other substances used to control pests."


reference from the National Association of State Departments of Agriculture:
National Pesticide Applicator Certification Core Manual, 2nd Edition, 2014 Chapter 1, p.6-7

"Pesticides include a wide assortment of chemicals with specialized names and functions. They are often grouped according to the type of pest they control:

Avicides
control or repel pest birds.
Bactericides
control bacteria.
Chemosterilants
sterilize insects or pest vertebrates.
Defoliants
cause leaves (foliage) to drop from plants.
Desiccants
promote drying or loss of moisture from plant tissues and insects.
Disinfectants
(antimicrobials) control microorganisms.
Fungicides
control fungi.
Growth regulators
alter the growth or development of a plant or animal.
Herbicides
control weeds.
Insecticides
control insects and related arthropods.
Miticides
(acaricides) control mites.
Molluscicides
control snails and
slugs.
Nematicides
control nematodes (roundworms).
Ovicides
destroy eggs.
Pheromones
attract insects.
Piscicides
control pest fish.
Predacides
control predatory
vertebrates (e.g., coyotes).
Repellents
repel insects, mites,
ticks, pest vertebrates, invertebrates, birds, and mammals.
Rodenticides
control rodents"

Hope you find this helpful, Cheers