was What's germinating this week. now pest control: Physan

Paul Licht plicht@berkeley.edu
Thu, 29 Dec 2011 14:54:53 PST
It's used fairly extensively here in the Garden. Just don't overdo it.

Paul Licht, Director
Univ. California Botanical Garden
200 Centennial Drive
Berkeley, CA 94720

On 12/29/2011 2:46 PM, ds429@comcast.net wrote:
> I have started experimenting with Physan to eliminate fungus and algae growth on the soil surfaces of potted plants. I originally started using it to prevent algae in the reservoirs of my wick-watered gesneriads, for whic h it is very effective. Accor ding to the manufacturer's claims, it will kill anything bad and nothing good. Does anyone have any experience with Physan  - particularly as an anti-dampoff agent?
> Dell
> ----- Original Message -----
> From: "clayton3120 clayton3120"<clayton3120@cablespeed.com>
> To: "Pacific Bulb Society"<pbs@lists.ibiblio.org>
> Sent: Thursday, December 29, 2011 5:13:45 PM
> Subject: Re: [pbs] What's germinating this week.
> Good Afternoon, Seed Sowers.
> This is great with all the trial info coming in.
> Today I received an order of   Irisseed, mostly Junos,   Anemone species,
> etc. etc.
> I will take half the batch of each and use the GA3 treatment, and the
> refrigerated seed in slightly moist medium.    It will be a while before I
> can post results.
> As i write this, here is a little report on Ga3 treated seed.
> Lilium  candidum  seed , sown  11/29/11, Ga3 treatment 250 ppm, planted in
> seed mix, and placed in coldframe,     10 seedlings emerged so far.
> Fritillaria spefsiotica , sown 10/27/11, Ga3 treatment 300ppm, planted in
> seed mix, 13 seedlings emerged so far.
> Narcissus rupicola ssp. rupicola, sown 10/27/11, Ga3 treatment 300 ppm,
> planted in seed mix,
> 12 seedlings emerged.
> etc etc
> A great continuing topic would be  damping off cultural practices,
> preventatives.
> Has anyone used 'Rootshield'  for an extended period?
> Rick K
> On Wed, Dec 28, 2011 at 11:22 PM, Lee Poulsen<wpoulsen@pacbell.net>  wrote:
>> With all the talk of Deno's research as well as the use of gibberellic
>> acid in getting seeds to germinate, I have to report that the method Diana
>> of Telos Rare Bulbs uses to germinate seeds from the two American
>> hemisphere mediterranean regions (Chile and California) has produced
>> amazing results for me this autumn. In the past, I've always just sown
>> seeds from both of these locations directly in 10-cm pots in the autumn and
>> other than watering them, I would just leave them outside to experience the
>> fluctuating autumn temperatures and sporadic rainfall that occurs here in
>> southern California naturally (since this is a mediterranean region in the
>> Western Hemisphere). I always get decent germination for most species, but
>> some species have never germinated for me. I would always attribute it to
>> their being from regions more poleward than where I live, and therefore
>> more chilly, or from regions at much higher altitudes than my location, or
>> even from regions more desert-y than my location.
>> Regardless, in her blog, Diana mentioned that for seeds from California or
>> Chile, she puts them in slightly moist vermiculite in sealed baggies in the
>> autumn and then places them all in a refrigerator. She then checks all the
>> bags on a regular basis for germination, and as they germinate, she takes
>> them out of the fridge and plants them in her regular seedling mix.
>> For me the process is still underway, so I don't know the final result,
>> but so far, the results have been overwhelming to me, both in the species
>> that have finally germinated for me, as well as in the numbers of seeds
>> that germinate. I've finally gotten Rhodophiala rhodolirion, both pink and
>> white versions to germinate, and they germinated almost as quickly as the
>> low elevation species did--about 2 weeks in the fridge. Also, the
>> Calochortus seeds from the first round that came from the BX have
>> germinated (I believe some of them were the old seeds from Nhu that Michael
>> Mace referred to). And then to my most pleasant surprise, several species
>> of Chilean seeds that I got in May of 2010 and was unable to sow that
>> autumn due to excessive business travel, have all germinated including
>> seeds that I didn't think would be viable that long.
>> It's a little more trouble to plant germinated seeds, but well worth the
>> increased germination rate. (Another example is Tropaeolum azureum: I've
>> always gotten maybe 1 or 2, never more than 3, seeds out of every 10 that
>> I've planted to germinate in the past. This time, 8 or 9 out of 10 seeds
>> germinated and I was completely unprepared for that. I purchased more of
>> this to try this year since I was unable to plant the seeds I bought a year
>> and a half ago. But the old seeds germinated in almost the same numbers, so
>> now I have two full pots of this growing!)
>> I think I'm sold on this method now.
>> --Lee Poulsen
>> Pasadena, California, USA - USDA Zone 10a
>> Latitude 34°N, Altitude 1150 ft/350 m
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