GLYPHOSATE ON TRIAL
sam_md
5 years ago
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Toronado3800 Zone 6 St Louis
5 years agoRelated Discussions
Resistance to rose rosette virus
Comments (55)I have earlier given a link to another thread where I discuss the results on neighboring roses of applying RoundUp to test roses. Since each thread will scroll off of this forum at a different rate, I feel it is appropriate to put that information into this thread. " To test for the occurrence of root grafting, experiments were conducted using the systemic herbicide Roundup®. Plants that were treated with the herbicide died as expected and approximately 50% of the adjacent, untreated Rosa multiflora ‘Burr’ plants and 10% of the adjacent untreated ‘Dr. Huey’ and ‘Sunflare’ plants showed mild herbicide toxicity symptoms. This could be explained if root grafting had occurred, allowing herbicide to move through the vascular connection between plants. " In the full paper the experimental conditions were given. "The Round-up tests utilized 470 multiflora plants, 148 plants of Dr. Huey, and 98 plants of Sunflare. The multiflora and Dr. Huey were planted approximately 11.8 inches apart (H.Kuska comment: it was not clear to me if they were mixed in the same row or in different rows). The Sunflare plants were planted 3.3 feet apart in rows. Roundup was applied to every other plant. The treated plants all died. About 50% of the multiflora plants showed roundup symptoms. 10 % of the Dr. Huey and 10% of the Sunflare plants showed symptoms." --------------------------------------------------------------------------------------- I would expect that 3.3 feet apart would not be uncommon in many home rose gardens. I cannot post the complete paper because it is copyrighted. However, I can send e-mail copies to a limited number of individual requests under the educational exclusion. My e-mail address is: kuska@neo.rr.com The abstract is at: http://www.actahort.org/members/showpdf?booknrarnr=751_26 -------------------------------------------------------------------------------------- Even the RoundUp label acknowledges that root grafting is a known problem: This is the instruction from the Round-Up label for cut stump applications: "Apply this product using suitable equipment to ensure coverage of the entire cambium. Cut trees or resprouts close to the soil surface. Apply a 50 to 100 percent solution of this product to the freshly cut surface immediately after cutting. Delays in application may result in reduced performance. For best results, applications should be made during periods of active growth and full leaf expansion. PRECAUTIONS, RESTRICTIONS: DO NOT MAKE CUT STUMP APPLICATIONS WHEN THE ROOTS OF ADJACENT DESIRABLE TREES MAY BE GRAFTED TO THE ROOTS OF THE CUT STUMP. INJURY RESULTING FROM ROOT GRAFTING MAY OCCUR IN ADJACENT TREES. Some sprouts, stems, or trees may share the same root system. Adjacent trees having a similar age, height and spacing may signal shared roots. Whether grafted or shared, injury is likely to occur to non-treated stems/trees when one or more trees sharing common roots are treated." http://aggie-horticulture.tamu.edu/syllabi/325/schedule/Pest%20Management/Chemical%20Application%20&%20Safety/Roundup%20Original.pdf --------------------------------------------------------------------------...See MoreFrom Dr. Lockhart
Comments (26)Dr, Lockhart's explanation for a possible confusion that HVX virus exists in 'soil' as well as his proposal for a phase II research project conclusively dispel the theory that HVX virus can survive outside of living tissue. I. Objectives of Proposed Research The AHS-funded HVX research project carried out during 2007-2009 was designed to answer a number of questions that are of frequent concern to hosta growers; in particular the means by which the virus can be spread to and infect healthy hostas. Among the results that were obtained, two were of particular interest and judged to warrant further investigation. These were the following: 1) HVX can be transmitted from infected to healthy hostas on cutting tools. 2) HVX can be transmitted to healthy hostas from infected residual root tissue present in the soil. Based on these results, an additional research project is proposed to address the following issues: 1) What are the most effective and practical means of decontaminating cutting tools in order to avoid spread of HVX? 2) For how long does HVX-infected residual root tissue remain infectious to roots of healthy replacement hosta? 3) How much virus-infected residual root tissue is needed to cause root infection? 4) Are any perennials planted to replace HVX-infected hostas susceptible to root infection by residual hosta roots present in soil? 5) Can root-to-root spread of HVX occur during post-harvest washing of roots for removal of soil? II. Experimental Methods To achieve the research objectives listed above the following experimental approaches will be adopted. Cutting tool decontamination tests using readily available, non-hazardous liquids(e.g. detergents, milk protein, oxidizing agents) to determine which are most effective in eliminating HVX surface contamination. 2) Plant healthy hosta test plants in soil containing HVX-infected root remnants at increasing intervals after removal of the original virus-infected plants. Test plants will be grown for two seasons and assayed for HVX infection by disease symptom development and serological and PCR testing. 3) HVX-infected root pieces will be mixed in varying amounts into garden soil in which healthy hosta test plants will Be planted. These test plants will be observed and assayed as described above for evidence of root-to-root HVX transmission. 4) A range of shade-adapted perennials, possible replacement plants for HVX-infected hostas, will be inoculated experimentally with five different isolates of HVX. These plants will be observed and tested for evidence of HVX infection as described above. 5) Todeterminewhetherroot-to-rootspreadofHVXcanoccurduringpost-harvest washing, healthy and HVX-infected hostas will be bound together and subjected to water-washingunderconditionscomparabletothoseemployedincommercialnursery operations. Healthy hosta test plants will be observed and tested for evidence of HVX infection as described above. If someone disagrees on this point then I expect they should provide a link to proof of their suggestion. Anything outside of facts proved on HVX virus may be interesting, but are completely irrelevant. Jon Emphasis mine....See MoreTwo years before the grass
Comments (12)Roselee, Our 'Raleigh'/'Palmetto' St Augustine front lawn has not responded well to my attempts to harden it to one deep watering per week max. I prepped a damaged section with herbicide that I was hoping to patch this spring with the new 'Tamstar' you've mentioned before, but it's still having supply problems. At this point, I'd plug the "dead zone" with 'Floratam' if it were sold this far north. Am confident we'll eventually have some sort of drought tolerant/low water use yard.... and still rooting for lawn over stone. Would like buffalo grass (BG) in the sunny sections of the front, but the remaining traces of the original Bermuda grass in our turf, need for an additional hard edge against our neighbor's St Augustine/Bermuda, and the considerably more prominent dog urine damage dissuade me from more than a little experimentation for now. The photo of BG urine damage I posted previously shows it at its least noticeable during active growth. As the BG starts to go dormant, the damaged spots don't recover and the lawn begins looking much worse - I never thought to take a photo...well, because it just looked so bad. St Augustine will occasionally show a bit of urine burn, but is significantly better than BG at tolerating those concentrated N blasts from our female K9s. One other confirmation of this relative pet "weakness" is that the source of our BG plugs now offers a hybrid Bermuda as their Dog Tuff product - though I'd still prefer the BG in our back yard....See MoreGlyphosate Front Lawn before reseed
Comments (7)I think the hardest part of starting from scratch is the irrigation. If you have a good system in place, it is easy peasy. Rounding up and seeding, you will get the best outcome but not without risk. You will still need to use Tenacity but the starter fertilizer with mesotrione (Tenacity) in it makes it easy. Depending on how much thatch you have, you might have to dethatch, aerate or verticut before spreading seed. In my mind, a renovation is a bit less work than an overseed and the results are far better. I will say that if you plan on have a blend of 100% TTTF or a blend of 100% KBG to give you a uniform lawn, you will be spending a lot of effort every year to eradicate any other type of grass which will be a lot more conspicuous....See Moreakamainegrower
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