[OGD] Re: Escapees
You wrote: Bernard C. Gerrard asked: Are there other man-made orchid hybrid escapes established in the wild? I do not know about hybrids, but I am currently staring at a picture of Arundina graminifolia (Asian) taken in Tingo Maria in Perú, where it was wild in the scrub. In the non-orchid sphere, AAAS Science did a piece on invasive species last year, in which they suggested that around 70% of the trees in Florida and rather more in Hawaii, the great majority of the grasses in California were now recent introductions. However, as orchids seeds are for the most part long distance travellers - at least in principle - it may be that they did their invading some time ago. Against this, facts such as continental segregation of all but weirdos such as Bulbophyllum and Vanilla, features such as the Wallace line and so forth. I may now make a fool of myself. However, it seems to me that manipulated genomes do poorly in the wild, particularly given the intensity and extent of their introduction. This is as true of ornamental plants as of crops. I suspect that we disable a large number of 'cautionary' systems that limit growth and flowering, but promote resilience in the wild strains. One sees cultivar-wild type hybrids, but these too seem ephemeral. I cannot think of a single instance where a man-made hybrid has escaped and made a pest of itself. Lantana cultivars, perhaps, or Bouganvillea; but none of these are a kudzu or a white bindweed. _ Oliver Sparrow Tel: UK (0)20 7736 9716 www.chforum.org www.treknepal.org www.datafreeze.com ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
Re: [OGD] EC vs TDS vs Common Sense
Bert, I think you missed the point of my original question, but that's OK, as nobody seems to have the answer anyway (and it isn't that valuable of a question anyway). It wasn't a debate over which was correct. I am, moreover, surprised that the scientist in you does not see the benefit in knowing one or the other. Yeah, I know what my water quality is, and I also know what I add to it. That doesn't guarantee that the pieces of equipment all cooperate all of the time, soI find it useful (maybe it's a security blanket, but it's still useful) to check the output stream periodically to see if I'm getting what I expect to my plants. Ray Barkalow - First Rays Orchids - www.firstrays.comPlants, Supplies, Books, Artwork, and Lots of Free Info!. - Original Message - From: [EMAIL PROTECTED] To: orchids@orchidguide.com Sent: Tuesday, January 18, 2005 11:36 PM Subject: [OGD] EC vs TDS vs Common Sense I have read all those heated discussions on EC TDS and wondered if I was experiencing a resurrection of medieval philosophers arguing about how many angles can dance on the head of a pin. Do orchids possess EC meters that tell them when to burn their roots? Can conductivity distinguish between good guys, such as nitrate, potassium and calcium, and bad guys such as sodium? And what about urea which has no conductivity at all? How do orchidsdecide how todistinguish straight water washesfrom highTDS fertilizer solutions? It would be wonderful if there were a simple instrument that would predict with accuracy the response of orchids to a dousing, but wishing won't make it so. I know from the municipal authorities what's in my water initially and I know what I add to it. I do monitor its pH with a glass electrode. What more do I need to know?Bert Pressman ___the OrchidGuide Digest (OGD)orchids@orchidguide.comhttp://orchidguide.com/mailman/listinfo/orchids_orchidguide.com ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] ED and TDS Meters
Bert Pressman said: I have read all those heated discussions on EC TDS and wondered if I was experiencing a resurrection of medieval philosophers arguing about how many angles can dance on the head of a pin. Do orchids possess EC meters that tell them when to burn their roots? Can conductivity distinguish between good guys, such as nitrate, potassium and calcium, and bad guys such as sodium? And what about urea which has no conductivity at all? How do orchids decide how to distinguish straight water washes from high TDS fertilizer solutions? It would be wonderful if there were a simple instrument that would predict with accuracy the response of orchids to a dousing, but wishing won't make it so. I know from the municipal authorities what's in my water initially and I know what I add to it. I do monitor its pH with a glass electrode. What more do I need to know?Bert Pressman Bert, You are missing the point. You should monitor your fertilizer concentration. You can do this with an EC meter combined with the fertilizer manufacturer's data. You can't do it with a so-called TDS meter unless you know what factor was used to convert EC to TDS. IMHO, this is much more important in an on-going basis than monitoring pH. Martin Epstein ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Re: Orchid Escapees
Here in my native Recife, Brazil, Renanthera grew all over the place on old mango, flamboyant and other trees. Now with all the building going on, they are disapearing fast. A new category : endangered escapee species?? Also on a trip to the southern state of Santa Catarina 15 years ago, I saw a huge ( 200 + canes) clump of orchids. I thought , it looked strange for an epidendrum species. On closer look, sure enough it was a dendrobium species ( nobile type) feeling right at home in the woods in South America. Julio -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.7.0 - Release Date: 17/1/2005 ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] EC/TDS Again
1. The point brought up by Mark does have merit; different ions have different "mobilities" in an electric field, hence different conductivities. So what exactly does measuring EC tell you about the effect of a given solution on orchids? 2. Technically, salts by definition include all substances, other than acids and bases, in which the charges of the particles [i.e., ions] balance each other. Magnesium carbonate is a perfectly good salt even if it appears to the eye to lack crystallinity. 3. Urea is very stable in water. Solutions of it decompose when ubiquitous bacteria containing the enzyme urease get into them. Urea can cross cell membranes not only because it is an uncharged molecule, but also because it is small enough. Glucose, which is also neutral but about three times the size of urea, cannot. 4. You orchidophiles havestrayed into territory best left tothose with technical backgrounds, but what does all this have to do with orchid culture? ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Orchids in Taiwan - a State affair.
FYI : Taipei, Jan. 19 President Chen Shui-bian called on domestic orchid growers Wednesday to intensify innovation, research and development, and international marketing to make Taiwan a kingdom of orchids. Chen voiced the hope that agriculture officials will do their utmost to bid for hosting the 2011 International Orchid Exposition in Tainan County source and full news release : http://english.www.gov.tw/index.jsp?action=cnacnaid=6259 ** Regards, Viateur ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Orchid Seed Pod Ripening Charts
I would like to know if there are any good online Orchid Seed Pod Ripening Charts. In particular, I have anAnsellia africana that was selfed in late October and would like to know about when it will be ready to flask. TIA Sue(Tampa Bay-FL) ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] harvesting time - Ansellia sp.
Sue, You asked : Ansellia africana ... selfed in late October and would like to know about when it will be ready to flask. Sauleda (Harvesting Times of Orchid Seed Capsules for the Green Pod Culture Process, in AOS Bulletin, April 1976) indicates that harvesting time for Anselia sp. should be 120-150 days. Michael (Aproximate Green Capsule Culture Harvest Times, in Proceedings , 16th WOC) recommends 150-180 days for Anselia species. ** Regards, Viateur ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Orchid labs in Philippines
Hi, Does anyone know of orchid labs in Manila or Olongapo or the highway in between... I am looking for a lab in this close vicinity., For Andy Easton.No these are not for reproliferation since to accuse me of this. Thank you. Peter Spear... ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Orchid Seed Capsule ripening charts
Sue who wrote: I would like to know if there are any good online Orchid Seed Pod Ripening Charts. In particular, I have an Ansellia africana that was selfed in late October and would like to know about when it will be ready to flask. Sue there is a chart called: Interval between pollination and growth of immature embryos in-vitro You will find it on page 274 of Orchid Biology Reviews and Perspectives II edited by Dr. Joseph Arditti. The time shown tells us when immature pro-embryos of non ripe seeds will continue to develop on an artificial medium, in-vitro; outside the capsule. It does not tell us how long it takes for the capsule to mature and produce ripe seeds,which may well be double or triplethe time shown in this chart. Peter ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Paph Saint Fujiwara
Greetings, Could someone be so kind to point out a picture of this paph hybrid? I know someone who would be interested in seeing it. I tried a Google search but didn't come up with anything. Therefore, if you have a picture from your private collection, or seen it in a journal, please email me! Thanks! Will ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] Re: Need to Measure EC/TDS
Maybe I'm missing something. If I habitually fertilize my orchids with 5 Oz 15-5-15 diluted to 20 gal, that works out to 1/4 Oz/gal. If there are 128 Oz/gal, that means I add 1/4 part fertilizer to 512 parts water or about 1 part fertilizer to 2,000 parts water.If thereare0.15 parts nitrogen/1 part fertilizer, this corresponds to 300 ppm nitrogen, all this without a meter. This amount of fertilizer also lowers the pH of my tap water [pH 8.6] to pH 6-6.5, a goodrange for absorption of nutrients by orchids. I suppose if I grew Masdavallias,I might aim for a more dilute fertilizer, but I don't. Why all the fussing for a meter that measures something you are not sure of? Incidentally, as a salt increases in concentration, its conductivity rises disproportionately less, making it difficult to use conductivity as a guide to diluting stock solutions. I hope the salt concentration of your water source is muchlower than that of your fertilizer solutions, otherwise run out and get an RO unit immediately.Bert Pressman ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
[OGD] SEC: UNCLASSIFIED:-Re: natural hybrids
Steve, Neville, et al; I will admit to seeing this whole arguement a little late but I do have a point. What occurs if one of these Natural Hybrids upon reaching maturity and flowering manages to cross itself back to either of the natural parents? What happens if that occurs a couple of times? To explain better lets say Sp 'A' Sp 'B' produce a natural hybrid 'AB'. 'AB' then manages to cross itself back to 'A' producing 'AAB'. 'AAB' then manages to cross itself back to 'B' or 'A' or indeed even 'C' if you are really unlucky!! Couldn't that hybrid, if it has departed far enough away from original parents, be misidentified as a species in its own right? Lets do a bit of a cse study on Aust Natives. Den. Tarberri crossed with Den. Rex. You will notice I am using new naming as that really does suit my purpose (it shows how ridiculous it is!!) You now have an interspecies cross by modern standards. Now cross the progeny back to Den. Tarberri. Now, depending on the outcome (cane size etc), try and prove it isn't straight Tarberri or Rex. Now cross that hybrid with Den. Kingianum. You'll have a natural hybrid called specio-kingianum but it's actually made up of 3 species. Just food for thought. Have fun!! Regards Paul Wheeler ___ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
