Lettuce growing very slowly; brown spots on leaves - Aquaponic Gardening2024-03-29T01:57:00Zhttps://aquaponicgardening.ning.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?commentId=4778851%3AComment%3A423801&feed=yes&xn_auth=noGreat advice as always Jon.
S…tag:aquaponicgardening.ning.com,2012-12-23:4778851:Comment:4249882012-12-23T23:37:10.871ZJim Fiskhttps://aquaponicgardening.ning.com/profile/JimFisk
<p>Great advice as always Jon.</p>
<p>So today I installed the fan, finally got around to cutting off the stand pipes on my first 3 ibc gbs (that I foolishly glued before I knew better, Used a dremel with a cutoff wheel) so as to keep the surface gravel dry, and removed all sick or infected plants and burned them in the gh woodstove (handy new use) and just plain feel better about saving the gh. This thread got me moving so kudos! I will start employing all the other great advice in this thread…</p>
<p>Great advice as always Jon.</p>
<p>So today I installed the fan, finally got around to cutting off the stand pipes on my first 3 ibc gbs (that I foolishly glued before I knew better, Used a dremel with a cutoff wheel) so as to keep the surface gravel dry, and removed all sick or infected plants and burned them in the gh woodstove (handy new use) and just plain feel better about saving the gh. This thread got me moving so kudos! I will start employing all the other great advice in this thread tomorrow. (well almost all)<br/> <br/> <cite>Jon Parr said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?xg_source=activity&id=4778851%3ATopic%3A421591&page=3#4778851Comment425134"><div><div class="xg_user_generated">Yeah, Jim, most of my comments on this forum are from my iPhone, and for some reason it gives me trouble now and then, not with chopping in half, but just won't post. So I copy and paste the comment to "notebook", and try again later (that is if I remember to)<br/> <br/> GH pest management has three strategies, and which is best is really open for debate.<br/> 1- intentionally low pest security, meaning wide open large screens for honey bees, pests, and pest predators. This works pretty good for lazy folks like myself, especially if you are planting beneficial plants to attract the predators. No fuss about pollination, and no big concern about sterilizing everything.<br/> 2- moderate pest security. This one is fine for new greenhouses, and light traffic GH's with cleanly guests. Once a pest gets inside, though, trouble trouble.<br/> 3- high security, meaning positive pressure and HEPA filters, thrips screening, humidity and temp control, haz-mat suits and dissinfect routines. Just the thought of all that work spoils my mood, but is probably the smartest long term plan for commercial use.<br/> <br/> I'm a low security type guy. Address the pest directly. Mold? Increase airflow and temp, decrease humidity. Spider mites, fungus gnats, white flies, aphids? Allow predators, spray with tea, nuke them with CO2. Nasturtiums are awesome for the garden by the way; trap crop or aphids, pest predator magnets, repel white fly and spider mites. Yep. And borage, and multicropping.</div>
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</blockquote> Yeah, Jim, most of my comment…tag:aquaponicgardening.ning.com,2012-12-23:4778851:Comment:4251342012-12-23T21:29:55.014ZJon Parrhttps://aquaponicgardening.ning.com/profile/JonParr
Yeah, Jim, most of my comments on this forum are from my iPhone, and for some reason it gives me trouble now and then, not with chopping in half, but just won't post. So I copy and paste the comment to "notebook", and try again later (that is if I remember to)<br></br>
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GH pest management has three strategies, and which is best is really open for debate.<br></br>
1- intentionally low pest security, meaning wide open large screens for honey bees, pests, and pest predators. This works pretty good…
Yeah, Jim, most of my comments on this forum are from my iPhone, and for some reason it gives me trouble now and then, not with chopping in half, but just won't post. So I copy and paste the comment to "notebook", and try again later (that is if I remember to)<br/>
<br/>
GH pest management has three strategies, and which is best is really open for debate.<br/>
1- intentionally low pest security, meaning wide open large screens for honey bees, pests, and pest predators. This works pretty good for lazy folks like myself, especially if you are planting beneficial plants to attract the predators. No fuss about pollination, and no big concern about sterilizing everything.<br/>
2- moderate pest security. This one is fine for new greenhouses, and light traffic GH's with cleanly guests. Once a pest gets inside, though, trouble trouble.<br/>
3- high security, meaning positive pressure and HEPA filters, thrips screening, humidity and temp control, haz-mat suits and dissinfect routines. Just the thought of all that work spoils my mood, but is probably the smartest long term plan for commercial use.<br/>
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I'm a low security type guy. Address the pest directly. Mold? Increase airflow and temp, decrease humidity. Spider mites, fungus gnats, white flies, aphids? Allow predators, spray with tea, nuke them with CO2. Nasturtiums are awesome for the garden by the way; trap crop or aphids, pest predator magnets, repel white fly and spider mites. Yep. And borage, and multicropping. OK, why does my reply get tru…tag:aquaponicgardening.ning.com,2012-12-23:4778851:Comment:4249692012-12-23T18:06:17.667ZJim Fiskhttps://aquaponicgardening.ning.com/profile/JimFisk
<p>OK, why does my reply get truncated? about half is being tossed away. Anyone else experiencing this or have I reached some sort of limit? Strange. I have retyped it all over again and once again it got cut in half.<a style="cursor: pointer;"><img src="http://www.bkserv.net/images/Frown.gif"/> I'</a>m done.</p>
<p>OK, why does my reply get truncated? about half is being tossed away. Anyone else experiencing this or have I reached some sort of limit? Strange. I have retyped it all over again and once again it got cut in half.<a style="cursor: pointer;"><img src="http://www.bkserv.net/images/Frown.gif"/> I'</a>m done.</p> Another great thread. You guy…tag:aquaponicgardening.ning.com,2012-12-23:4778851:Comment:4249662012-12-23T17:55:28.867ZJim Fiskhttps://aquaponicgardening.ning.com/profile/JimFisk
<p>Another great thread. You guys rule. Truth about Forums is that all the info in the world means pretty much nothing until you run into these problems and then the light goes on in your (read mine) head when you need it. I learned more in the few min it took me to read thru this thread than in the past month (at least) regarding GH AP.</p>
<p>I was ready for this thread as now I am running into the dreaded GH scenarios of which there are sooo many. Basically you are saying to treat the GH as…</p>
<p>Another great thread. You guys rule. Truth about Forums is that all the info in the world means pretty much nothing until you run into these problems and then the light goes on in your (read mine) head when you need it. I learned more in the few min it took me to read thru this thread than in the past month (at least) regarding GH AP.</p>
<p>I was ready for this thread as now I am running into the dreaded GH scenarios of which there are sooo many. Basically you are saying to treat the GH as a "clean room". I have purchased many seedlings and now I AM SCARED<a rel="nofollow" style="cursor: pointer;"><img src="http://www.bkserv.net/images/Frown.gif"/></a></p>
<p><a rel="nofollow" style="cursor: pointer;">I have a whole gal of food grade H2O2 so I will add that to my list. (carefully). I will purge the gh of all unhealthy looking plants (and burn them), I will start all seedlings soiless, I will add a fan today, I will never purchase seedlings again, I will adjust all gb levels to 2" below grade. Did I miss anything Gurus? Oh yeah, I promise to be a better student</a><a style="cursor: pointer;"><img src="http://www.bkserv.net/images/Grin.gif"/></a></p> Indeed, be careful about usin…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4238972012-12-19T05:11:13.037ZJon Parrhttps://aquaponicgardening.ning.com/profile/JonParr
<p>Indeed, be careful about using H2O2 or any dissinfectant in AP, of course. But in order to harm your bio filter, it must reach your biofilter as active H2O2. If you dump a whole bottle of hardware store 3% in your grow bed, the H2O2 will kill single celled organisms indiscriminately as it disperses through the system, leaving in it's wake a sterile pathway. Big deal. If it doesn't wipe out the whole system, the system will recover, probably without hiccup. That can't be said of any other…</p>
<p>Indeed, be careful about using H2O2 or any dissinfectant in AP, of course. But in order to harm your bio filter, it must reach your biofilter as active H2O2. If you dump a whole bottle of hardware store 3% in your grow bed, the H2O2 will kill single celled organisms indiscriminately as it disperses through the system, leaving in it's wake a sterile pathway. Big deal. If it doesn't wipe out the whole system, the system will recover, probably without hiccup. That can't be said of any other disinfectant. The truth is that H2O2 is very short lived in an abundance of bacteria, as the bacteria it kills robs the extra O, and leaves behind H2O. Of course you can do damage, but it is a very mild risk for the benefit it carries. If your media is dry for 2" like it's supposed to be, then you can fog the plants and surface liberally (use your noggin), and the H2O2 won't make it to the fish or the biofilter. I do it all the time.</p>
<p>The fact is that spore carry the problem to other areas, and stick around to cause problems again, and H2O2 kills spore. It doesn't kill the fungus, it doesn't kill the plants, it doesn't kill insects, but it does kill spore and bacteria. If you really want to impress your friends, use a cap-full of H2O2 for the first watering after you plant seeds. It will kill any spore and bacteria immediately surrounding the seed, and rapidly quicken the softening of the hull, cut germination times in half, and increase germination rate. It may even fix your infected seeds, IDK. </p>
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<p>Yes Bob, 1 1/2 to 3% can be put straight in a spray bottle, and is a good disinfectant to use for your garden tools, cleaning pumps and hoses, test equipment, fish nets, etc. </p>
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<p>Don't let any go straight to the fish tank, as there are far fewer bacteria to sacrifice before it hits the fish's gills, which could be lethal.<br/> <br/> <cite>Roger said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?commentId=4778851%3AComment%3A423673&xg_source=msg_com_forum#4778851Comment423925"><div><div class="xg_user_generated"><p>I'd watch out using H2O2 in your AP system. It is a disinfectant that will kill that bacteria in your bio filter. If you do use it try to cover the top of your GB so none of it enters your AP system.</p>
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</blockquote> What is a good strength of H2…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4236732012-12-19T03:33:48.509ZBob Campbellhttps://aquaponicgardening.ning.com/profile/BobCampbell
<p>What is a good strength of H2O2 to use? I just looked at the bottle of Hydrogen Peroxide I bought at the drug store and it says 3% topical solution. Would you dilute this or use it straight?<br></br> <br></br> <cite>Jon Parr said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?xg_source=activity&id=4778851%3ATopic%3A421591&page=1#4778851Comment422452"><div><div class="xg_user_generated"><p>I would…</p>
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<p>What is a good strength of H2O2 to use? I just looked at the bottle of Hydrogen Peroxide I bought at the drug store and it says 3% topical solution. Would you dilute this or use it straight?<br/> <br/> <cite>Jon Parr said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?xg_source=activity&id=4778851%3ATopic%3A421591&page=1#4778851Comment422452"><div><div class="xg_user_generated"><p>I would personally mist the plants and surrounding area lightly with hydrogen peroxide to kill spores while handling, and to help prevent any spores from going airborne. No big deal, but H2O2 is a relatively safe disinfectant, and leaves nothing behind but water and oxygen.</p>
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</blockquote> I started the plants from see…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4236722012-12-19T02:31:55.234ZDennis Jayhttps://aquaponicgardening.ning.com/profile/DennisJay
<p>I started the plants from seeds in dirt and didn't buy them as seedings. You're right about this being a source for pathogens. <br></br> <br></br> <cite>Jonathan Kadish said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?commentId=4778851%3AComment%3A423668&xg_source=msg_com_forum#4778851Comment423840"><div class="xg_user_generated"><p>I thought you said you took tomato plants from dirt and put them in the…</p>
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<p>I started the plants from seeds in dirt and didn't buy them as seedings. You're right about this being a source for pathogens. <br/> <br/> <cite>Jonathan Kadish said:</cite></p>
<blockquote cite="http://community.theaquaponicsource.com/forum/topics/lettuce-growing-very-slowly-brown-spots-on-leaves?commentId=4778851%3AComment%3A423668&xg_source=msg_com_forum#4778851Comment423840"><div class="xg_user_generated"><p>I thought you said you took tomato plants from dirt and put them in the system... that could be a source for pathogens if the bacteria was in the dirt. <br/><cite><br/></cite></p>
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</blockquote> Makes sense. but aren't more…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4236682012-12-19T01:29:21.284ZRoger Baldwinhttps://aquaponicgardening.ning.com/profile/RogerBaldwin
Makes sense. but aren't more mature plants more susceptible to such ailments because of the lack of light and air penetration? I plan on keeping the top of the LECA dry by elevating the net pots with the blue board. And also I am a big fan of circulation, I have a HAF(horizontal air flow) fan constantly blowing across my GBs. I will try to germinate straight in the DWC tank for this go around, but I will keep your recommendation in mind if i encounter problems... That's one good thing about…
Makes sense. but aren't more mature plants more susceptible to such ailments because of the lack of light and air penetration? I plan on keeping the top of the LECA dry by elevating the net pots with the blue board. And also I am a big fan of circulation, I have a HAF(horizontal air flow) fan constantly blowing across my GBs. I will try to germinate straight in the DWC tank for this go around, but I will keep your recommendation in mind if i encounter problems... That's one good thing about starting small, it makes it easier to experiment. I'd watch out using H2O2 in y…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4239252012-12-19T01:20:42.165ZRogerhttps://aquaponicgardening.ning.com/profile/RogerEmmick
<p>I'd watch out using H2O2 in your AP system. It is a disinfectant that will kill that bacteria in your bio filter. If you do use it try to cover the top of your GB so none of it enters your AP system.</p>
<p>I'd watch out using H2O2 in your AP system. It is a disinfectant that will kill that bacteria in your bio filter. If you do use it try to cover the top of your GB so none of it enters your AP system.</p> I'm not saying that there wil…tag:aquaponicgardening.ning.com,2012-12-19:4778851:Comment:4236672012-12-19T00:56:22.667ZVlad Jovanovichttps://aquaponicgardening.ning.com/profile/VladJovanovic
<p>I'm not saying that there will necessarily always be a problem, but I'm a really, <em>really</em> firm believer in not keeping things overly moist at the young seedling stage...floating the 'youngins' 2 maybe 3 times a day for 10-15 minutes at a time is plenty for me. of coarse this will depend a bit on your location (heat/light). I can't remember the last time I saw a bout of pythium, collar rot, crown rot, root rot etc...</p>
<p>Actually, I like to somewhat air-prune my seedlings for the…</p>
<p>I'm not saying that there will necessarily always be a problem, but I'm a really, <em>really</em> firm believer in not keeping things overly moist at the young seedling stage...floating the 'youngins' 2 maybe 3 times a day for 10-15 minutes at a time is plenty for me. of coarse this will depend a bit on your location (heat/light). I can't remember the last time I saw a bout of pythium, collar rot, crown rot, root rot etc...</p>
<p>Actually, I like to somewhat air-prune my seedlings for the first 10-15 days. </p>