What is wrong with my green beans

rainpebblesMay 6, 2011

I built 3 4'x8'x18" raised beds. In one we planted a row of green beans (about 4-6 weeks ago). They shot up in no time and were looking really good. Soon there after, I constructed a trellis for them of jute and they loved it - grabbed right on and started growing - for about a week. Then, they turned light green and are now nearly yellow and all growth has come to a halt. They are watered from a drip irrigation system that I installed, though for the first few weeks they were watered by hand. I did not mulch them, because I heard somewhere that mulching a vegi garden is not a good idea. They don't get 100% sun, they are in shade in the morning, but do get 6-8 hours of full sun. They are planted in organic growers' mix: decomposed organic compost, lava sand, Texas Greensand, and a soil/sand mixture.

Can anyone tell me where I went wrong and why the crop failed?

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happyday(WI4a)

My plants all love mulch. I use plastic or grass clippings.

Could your plants be getting overwatered? How often do you water, what does the ground feel like?

    Bookmark   May 6, 2011 at 11:24PM
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seysonn(8a WA/HZ 1)

I think, from your description, that they lack nitrogen. Shade can cause pale color but 6-8 hours sun should be fine.
Also, too much water can cause pale color, because nitrogen being easily water soluable may go down beyond the reach of the roots.Too much rain also can make the bad situation worse. I woud say, go ahead and feed them, lightly, more regularly.Mulching is always good, but not with wood chips or plastic. I use fall leave, straw, pine straw and hay. Mulch serves more than one purpose: can keep moisture longer, can keep soil cooler, preven weeds growth.
Another point is: what did you fill the raise bed with? how deep? and what is underneath?

    Bookmark   May 9, 2011 at 1:56AM
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happyday(WI4a)

If there is a reason not to use plastic, or (seedless) grass clippings which would add nitrogen, I'd like to know what it is.

    Bookmark   May 9, 2011 at 11:12AM
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lilcee

Have you figured out what is wrong with your beans? I'm having the same problem with mine. They came up, grew good. The plants are huge and have lots of blossoms but the leaves have all turned light green or yellow. I know they aren't getting over watered - we live in Fl and it's been dry so I water them once or twice a week. I applied some black cow and watered it in. Took a soil sample and the nitrogen was very low and everything else was med. Could it be the nitrogen since the plants are so big? What's the best thing to add for nitrogen?

    Bookmark   May 17, 2011 at 4:56PM
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tatton95(5)

Something very similiar happened to my pole beans(Emerite & Fortex)so I am very curious to see if anybody knows what the problem is. My beans grew very quickly up a 6 foot trellis, filled in nicely and had tons of blossoms and I was starting to get beans. Then the growth slowed, the blossoms dropped, the leaves turned yellow and eventually started dropping, and of course the bean production dropped off to almost nothing. The weather was dry, daytime temps low to mid 90s, night time temps in the 60s. I planted the beans in a row that had other plants planted in half of the row about a month earlier, but the drip system was watering the whole row. I didn't re-fertilize the section I planted the beans in so I wonder if most of the nitrogen was watered out. I added some nitrogen and there was some new growth, but it was late enough in the season I didn't see a huge improvement. I didn't think beans need much nitrogen, so it seems strange that a lack of nitrogren would have such a devastating effect. Any suggestions would be much appreciated. Thanks.

Brett

    Bookmark   May 24, 2011 at 11:00AM
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tn_gardening

I wonder if it's bean mosaic disease/virus?

    Bookmark   May 26, 2011 at 8:02PM
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tatton95(5)

Just curious if anyone has any other suggestions?

Thanks.

brett

    Bookmark   June 27, 2011 at 3:59PM
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happyday(WI4a)

If it wasn't a bean virus, I would have mulched heavily, sprayed with everything but nitrogen, and kept it properly watered, just enough to revive it from droop, not so much that it drowned.

If it was a bean virus, I'd rip the plants out and burn every last bit of them, till the soil, and not plant beans there for a year or two. I'd also look for any anti-viral treatment to spray on all the remaining plants in case they acted as carriers, and would look for virus resistant beans to plant in future.

    Bookmark   June 27, 2011 at 8:23PM
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