using glyphosate near azaleas
fireweed_1947
12 years ago
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botann
12 years agofireweed_1947
12 years agoRelated Discussions
Glyphosate near Blueberries
Comments (6)velpar works as a pre emergent in a non crop year. sinbar just works on grass in a non crop year. post is only for grass and can be applied when the grass is 3-4 inches once in a cropping year. glyphosate I only apply directly (Brush)after harvest. I have about 4 ac of low bush blue berries and go to classes put on by U of Maine every year. After 15 years I am still the newbie. I have moved from 500 lbs. per ac to 4800 lbs per ac. The old timers say that timming is everything. If you need to apply tuseday may 13 th at 2:30 at 68 degrees you best be on the tractor. Maybe that is why they get 10000- 12000 lbs per ac. When I learn all this I will have my great grand children pick me up at the nursing home and take me home to spray....See Morerrd and glyphosates????
Comments (7)I've looked for (and not found) any studies on the break-over point (my words) for when glyphosphate doesn't kill but just damages. Decades ago, when Glen Viehmeyer had a cold hardy rose breeding program in North Platte Nebraska, that program was destroyed by RRD. At that time, no one was quite sure what RRD was and he wrote to all the rose sages, all of whom told him it was glyphosphate. His angry response (I have copies of his correspondence) was that he was there when glyphosphate was first introduced and he knew what it would do to roses and what was happening to his acres of test roses was far worse. Dr. Cynthia Westcott was so concerned (She had written books about rose growing) that she went into the literature and found an earlier reference to the disease and hand typed out the paper to mail to him. The 'juices' have been used to transfer the disease to Tobacco (the paper is by Hills, Epstein and Rohozinski. although I may have the authorship order backwards) but they weren't able to isolate it and do PCR replication on it. About the time it takes for a virus to be proven a virus: it used to be decades. A similar disease of Black Currents has been a major problem in Black Currents in Northern Europe for about a century. It's called Black Current Reversion Disease, now Black Current Reversion Associated Disease, and it's only in the past five years that the virus has been proven to be a virus and its genetics deciphered. And several other diseases are seen in the mix. Is RRD a simple virus? Don't know. Could it be worse if it gets into a rose with other (including Rose Mosaic Viruses)? Don't know. But, the synergistic happenings with other plant diseases suggest multiple diseases in a plant can make symptoms that are worse than the sum of symptoms of the individual diseases. On the link below, go to page 1344 (which is the 3rd of 4 pages) and read how two USDA scientists augmented RRD and monitered its spread in Maryland. (And they were successful.) What Dr. Amrine has told me is that the spread by budding is most successful in spring, which is probably a function of the roses' ability to bud sucessfully and transfer juices within itself. The Doderick paper from the bibliography is a summary of a Masters in Missouri where they tried to transfer the disease by pressure injection of juices and they didn't succeed. Dr. Epstein has continued to teach farmers how to spread the disease by budding sick buds onto healthy multiflora. Here is a link that might be useful: Natural and augmented spread of RRD in MD...See MoreGlyphosate near natives
Comments (14)For the record I work in a bush crew company and know a bit about weed control. Now glyphosphate is great for killing weedy grasses/monocotyledons but, despite the false advertising, it is generally ineffective or less effective against broad leaf weeds/dicotyledons. Now remember that plants with strappy leaves e.g. Dianella/Flax Lilies are, like grasses, monocotyledons and will be greatly effected by roundup. It definately will do little or nothing to Soursob/Oxalis. For this weed and many others like it that have bulbs you need to use much stronger broad leaf/woody weed specific herbicides such as KambaM, Brushoff/Esteem or Garlon. I recently checked up on regulations regarding these and it seems that, in Victoria, you are allowed to use amine formulations of these herbicides without an Agricultural Chemical Users Permit. But I recomend that these should be used with caution in terms of OH&S and environment. Painting preparations of these on to weeds would be OK as long as you wear appropriate safety gear. Bearing in mind that glyphosphate does not work that well on docotyledons, most native shrubs are not greatly effected by small amounts of it. The foliage that is hit by the glyphosphate will obviously die however unless you some how accidently spray 100% of foliage it is highly unlikely that the tree or shrub will be killed outright. If weedy grasses are the problem then you can use Fusilade which is a specific grass killer. Unless anyone out there knows of any exceptions, this can be sprayed over all dicotyledons, sedges and rushes. Ideal for a garden beds infested with couch or kikuyu. Not suitable for use near edge of water however....See MoreWHO called glyphosate a "probable carcinogen"
Comments (29)What I've been saying all along is that I believe the best way to test the relative level of those risks is to compare the overall health of people that engage in those risks to those that do not. This is how the risk of smoking was most convincingly established. If OP's create significant risks to human health, how on earth can the people who actually experience high exposures to them on a regular basis completely escape the consequences- are you suggesting that dosage is not relevant either specifically or cumulatively? That makes absolutely no sense to me. Epidemiological research doesn't win any one Nobel prizes, it is not terribly creative stuff for a scientist, but in the end, it is often the best way to sort the wheat from the chafe when trying to determine actual levels of risk of any substance in the environment to human health. In the case of pesticides, such evidence is particularly accurate and useful because we have a very distinct segment of the population with uniquely high exposures to them. One can't sort out which pesticides do what but if collectively no great harm is being done then none of the various exposures in themselves can be very significant. At the time of the last study I posted, the farmers surveyed were using a lot of OP chemicals because much of the banning hadn't begun. So both recent accidents and long term health consequences are in the data. Please address any flaws you find in the logic of what I've posted here before posting more research of potential links to cancer or whatever. They never seem to offer an assessment of the actual level of risk, so they are virtually worthless, except as suggestions for epidemiological research to realistically verify the suggestd links ....See MoreEmbothrium
12 years agorhodyman
12 years agokenny88
12 years agorhodyman
12 years agoEmbothrium
12 years ago
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