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BANGKOK 22 March 2019 11:32


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About drtreelove

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  1. You may get more feedback by posting this on the Food or especially Health forum. If you think you or loved one have contacted a parasite or disease organism, seek medical help right away. Sheryll on the Health forum will help direct you to a specialist in your geographical area. If it's general information you want and don't get the specific answer to your question, the safest personal health policy I believe is don't eat raw or undercooked seafood or other meats, wash clean all food, utensils, cutting boards and countertops.
  2. Thanks again Notagain, and Grollies for the OP. I thoroughly read this paper again today. It's a Masterpiece, in my opinion. The beauty of it is in the comprehensive consideration of so many aspects of the disease, the insect vector, the various control options including cultural/growing condtions, biocontrols, and OMRI listed biopesticides. The authors are aware of some of the most recent biopesticide developments, and also include discussion of biostimulants, humic substances, microbial inoculants, seaweed extracts, microntrients, nanoparticles (? whew!), impacts from environmental stress, and development of HLB resistant varieties. This paper could/should be a guideline for how to comprehensively view modern organic land care and crop management, not only HLB. Here's my favorite, the master statement from the conclusion: "It is paramount that a grower applies many control prac-tices simultaneously to get the most effect from each. IPM acts synergistically; the results of the combined efforts will be better than the sum of each part added individually" https://www.organic-center.org/wp-content/uploads/2019/01/HLB_FarmerGuide.pdf And did you see this page: https://www.organic-center.org/who-we-are/meet-our-scientists/
  3. My wife just lost all her chats, photos etc but saved the contacts in a phone switch. After the fact, our daughter came around, who is more LINE savvy, and told us that there is a LINE back up function that you have to do first.
  4. That's an amazing paper. thanks. I was out of touch and didn't know about the biological controls that have been explored. I'm not sure this could be achieved without a big gov backed program. Unless its a very large orchard or community cooperative, biological control agents can get wiped out by overspray from a neighboring farm. I am pesimistic about practicality of some of the excellent program components and availability for Thailand. Most of the sophisticated new biopesticide materials are not available here. And those that are may not get enough percentage of control to satisfy local growers. I like this: -The important takeaway message from these studies and publications is that: -Insecticides approved for organic production use can work almost as well as standard synthetic insecticides but provide control for a shorter period. -OMRI approved insecticides should be applied in rotation and diligently in response to insect scouting and sampling counts that meet action thresholds; this could mean every 2 weeks. -OMRI approved horticultural oils not only provided strong control (80% adult mortality in some studies) when used alone but can increase adult ACP mortality to 97% when combined with other products such as M-Pede or Grandevo. (M-Pede is a commercial brand of insecticidal soap.) Combine with horticultural oil is something I didn't mention before but I've used this tank mix for other pest issues with great success. This paper indicates that insecticide and oil mix has longer residual than botanicals or soap alone. And this combo may be the most affordable. 97%, can't touch that with anything else.
  5. The one thing I don't buy with some of this thinking, is the old "which comes first" scenario, in this case it's the bacterium or the psyllid. This article seems to indicate that the plant is weakened by the bacterial infection and then the infestation by the psyllid occurs after the fact. I don't think so. I'm not a scientist, just an old tree worker since I was a kid, evolved over the years into tree doctor, trying to figure out the nitty gritty of what I'm working with. Unless we're talking about an occult phenomenon, or some science that I don't yet understand, for a bacterial disease to be present in plant tissues, it would have had to have a method of entry, a path of introduction; it doesn't just manifest out of nowhere. Spores can be blown in the wind and rain, honey bees can introduce through flowers (fireblight), wounding can open a path of entry, or sometimes spores can land on bark tissues and create lesions that progress into systemic infections (bacterial cankers). From what I've read from University of Florida and U California, from China and other research, it's been pretty well established that the Asian citrus psyllid is the primary vector of the HLB bacteria. It's a sucking insect that feeds on infected plants and then flies and feeds on uninfected plants where it inserts mouth parts and fluids and through that path of entry introduces the bacterium into the new plant. As far as I know, no other path of entry has been established. Tell me if I'm wrong. The the susceptibility of the plant to infestation as well as for the bacterium to thrive, is where I join in the notion that growing conditions, soil and water management are fundamental issues. Detrimental practices also come into play, like years of hard chemistry applications in the form of chemical pesticides and high NPK fertlizers that disrupt soil health and the processes of nutrient assimilation. It takes time and money to rebuild soil health after detrimental practices are discontinued. From my experience, with the "high nutrient density" approach (Albrecht school), with soil testing, prescribed mineral and biological amendments, building soil organic matter, mulching and intellilgent water management, some positive results will be seen right away, but it really starts to kick in with best results in about two years. That's when you start to see a reall drop off in pest and disease incidence, due to building of plant resistance. If you are committed to a comprehensive organic program, no hard chemistry pesticides or fertilizers, intelligent soil and water management and IPM, during that two year period of time, it is especially important to keep up with a preventive spray program to deter the feeding by the disease vector, the ACP. Unfortunately, soft chemistry botanical insect pest repellents don't have a long residual effectiveness. This means spraying neem or another botanical will have to be done every two weeks, or every week during high risk periods of the pest life cycle. But it makes an organic program time consuming and expensive. Azadirachtin (neem extract) concentrates are available, and are effective as a repellent, feeding and reproductive disruptor, but they are not cheap, especially with two week interval applications. Then there is wood vinegar and some other botanicals available, with which i don't have much experience. Aromatic oils, rosemary, clove, lemon grass, etc, some which you can make yourself, may be effective. They would be appropriate for citrus because the residual oils and odors would not be as much of an issue as it is with produce or thin skinned fruits that would have to be washed. In my opinion, the spraying or injection of anti-biotics is unnecessary for HLB, unless it is ever proved that the bacterium enter through the flowers or by any other path than the psyllid feeding. If you can keep the psyllids off the plants and from feeding, then there will be no bacteria in or on the plant to make anti-biotics an appropriate method of control. This approach that I've suggested is concerned with prevention, for plants not yet infected. Pro-active vs reactive. The article that Grollies presented was oriented to curing active infections and declining/dying plants. Thats a tall order and something I have not been involved with. But I like their approach of stopping detrimental practices and building soil health as a primary concerns for rebuilding plant health. A proprietary curative formula? I guess everybody has to have something to sell in order to make ends meet.
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