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#1
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I have a small greenhouse devoted to tomatoes of various kinds. I have six
Dutch pots on each side for a total of twelve. I am having trouble with mildew or fungus on the leaves. At first the leaves start showing gray blotches that I believe is the mildew. Then they start to shrivel and turn brown. Then I can break them off easily where the meet main stems. In the morning, there sometimes are water droplets on the leaves. Can that be the problem. I run a fan in the middle of the night to reduce humidity for about an hour. Is that enough? I am now running an experiment. Instead of using the regular hydroponic drippers that I got originally, I am using four kinds. The original dripper, 1/2, 1, and 2 gph (gallon per hour) drip irrigation drippers. My routine is off at night. During the day I irrigate with a half hour 2-1/2 hours off during the day. This way I hope to be able to get a handle on my irrigation schedule. I would appreciate hearing other experiments, suggestions, and interpretations. I also have a General Hydroponics Power grower outdoors. In general, the vegetation in it seems to be healthier, maybe because there is less condensation. I also recently assembled and put on line three growers with designs ripped off of the Power Grower. They have not been running long enough to have much vegetation. Three more are in the works. I am using Grow More nutrient for tomatoes as per instructions. Bill |
#2
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![]() "Repeating Decimal" wrote in message ... I have a small greenhouse devoted to tomatoes of various kinds. I have six Dutch pots on each side for a total of twelve. I am having trouble with mildew or fungus on the leaves. It might help to know where you are, but it sounds like a humidity problem. Why not just leave some windows/panels/the door open instead of running a fan? Your high-tech hydroponics+fan system seems over-engineered for the plant care you need. -- Brian "Stuck down a hole, in the fog, in the middle of the night, with an owl." |
#3
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On Sat, 07 Jun 2003 03:00:43 GMT, Repeating Decimal wrote
in rec.gardens.edible: In the morning, there sometimes are water droplets on the leaves. Can that be the problem. Yes. Try to keep the leaves dry. I cannot answer the rest of your questions as I do not have a green house. -- Gardening Zones Canada Zone 5a United States Zone 3a Near Ottawa, Ontario |
#4
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why not spray them with some copper or dithan?
On Sat, 07 Jun 2003 03:00:43 GMT, Repeating Decimal wrote: I have a small greenhouse devoted to tomatoes of various kinds. I have six Dutch pots on each side for a total of twelve. I am having trouble with mildew or fungus on the leaves. At first the leaves start showing gray blotches that I believe is the mildew. Then they start to shrivel and turn brown. Then I can break them off easily where the meet main stems. In the morning, there sometimes are water droplets on the leaves. Can that be the problem. I run a fan in the middle of the night to reduce humidity for about an hour. Is that enough? I am now running an experiment. Instead of using the regular hydroponic drippers that I got originally, I am using four kinds. The original dripper, 1/2, 1, and 2 gph (gallon per hour) drip irrigation drippers. My routine is off at night. During the day I irrigate with a half hour 2-1/2 hours off during the day. This way I hope to be able to get a handle on my irrigation schedule. I would appreciate hearing other experiments, suggestions, and interpretations. I also have a General Hydroponics Power grower outdoors. In general, the vegetation in it seems to be healthier, maybe because there is less condensation. I also recently assembled and put on line three growers with designs ripped off of the Power Grower. They have not been running long enough to have much vegetation. Three more are in the works. I am using Grow More nutrient for tomatoes as per instructions. Bill |
#7
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![]() "Repeating Decimal" wrote in message ... in article , Brian Watson at wrote on 6/7/03 12:30 AM: Why not just leave some windows/panels/the door open instead of running a fan? I am located in the Los Angeles Area near the coast. I do not want to leave direct paths open to incoming insects. I have screening draped over the vents. Even so, I do have ants creeping in and small white and other flies. I am now setting growers outside the greenhouse. Although I have not harvested tomatoes from them yet, the do not have the same mold/mildew problems. Then it does seem to be a humidity problem.. What's the problem with incoming insects? Do you get a flying pest problem where you are? -- Brian "Stuck down a hole, in the fog, in the middle of the night, with an owl." |
#8
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#9
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in article , Repeating Decimal at
wrote on 6/8/03 12:07 PM: in article , Brian Watson at wrote on 6/8/03 12:30 AM: I am now setting growers outside the greenhouse. Although I have not harvested tomatoes from them yet, the do not have the same mold/mildew problems. Then it does seem to be a humidity problem.. What's the problem with incoming insects? Do you get a flying pest problem where you are? I guess what I do not want is an infestation of tomato or tobacco horn worms. Nevertheless, now that you have planted that idea in my mind, that may be a reasonable solution. What I do not understand, is: why should that problem be so severe now when it wasn't the previous year? I think I will let my experiment run another week or two before opening the door. That will give me an idea if I am watering too much or not. Bill Well, I have bitten the bullet. I am leaving the greenhouse door ajar by about six inches. Bill |
#11
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in article , Jan Flora at
wrote on 6/10/03 4:41 PM: In article , wrote: On Sat, 07 Jun 2003 03:00:43 GMT, Repeating Decimal wrote in rec.gardens.edible: In the morning, there sometimes are water droplets on the leaves. Can that be the problem. snip You need good air circulation to avoid the sort of problems you're having. Open the door. Open the vents. Let the plants breathe! I am doing that now. For whatever reason, the problems are much worse this year than last. If you aren't letting bugs get in to pollinate the 'maters, you'll need to tap on the stems once in awhile, so they'll pollinate. (I tap mine once or twice a day.) The first year, I did that, since then, even though I do not tap on a regular basis, pollination does not appear to be a problem. I just ordered a book from the bookstore called "Greenhouse Gardener's Companion." All of the reviews raved about it. I'll report back as soon as I pick it up. I am looking forward to that. Bill |
#12
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