Quote:
Originally Posted by joseph
I wonder if the varieties of beans planted in the fall should be different varieties than those planted in the spring?
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Quote:
Originally Posted by Worth1
When you said you had nitrogen nodules on your bean roots I was skeptical but didn't want to say anything not wanting to insult.
I suspected nematodes and you said you were going to take them to the experts I knew the truth would come out one way or the other.
If you google nematodes on bean roots you will get pictures of nitrogen nodules and nematodes.
If you do the same for nitrogen nodules you will get the same results. 
A little info about those nitrogen fixing plants they do it for themselves not other plants.
If one is allowed to go to full maturity and produce seed the nitrogen is greatly used up.
If crimson clover is sown on an acre of land and tilled under or mowed right before it goes to seed it will produce 100 pounds of nitrogen.
If you let it go to seed it will not do this.
Worth |
To make matters worse, it seems not apparent if any varieties of Green Beans are capable of resistance to nematodes in the fall season when soil temperatures are still high. I take the liberty to quote from a University of Florida article for whicI provide a link after the quote.
"Many nematode-resistant snap bean cultivars have been developed, but the only resistance incorporated into these beans is for the nematode Meloidogyne incognita. The nature of the resistance is a delay in nematode development rather than reduced ability of the nematode to penetrate the plant root. For many resistant cultivars (including Nemasnap, Kabanima, P.I. 313709, Alabama no. 1, Carioc, Manoa Wonder, BAT 1297, A55, A56, A322, A439 and AB 136), resistance is lost when soil temperatures exceed 80–85°F (27–29°C). Use of these resistant varieties may be limited to the spring crop, when soil temperatures are lower. Resistant cultivars for which heat instability is unknown include Tendergreen, Tenderpod, Saginaw, Wingard Wonder, Rico 23, P.I. 165435, and Alabama 2, 8 and 19, many of which are old varieties, or breeding lines that may be low yielding, horticulturally unacceptable (i.e., developed for home garden), and/or commercially unavailable.56, 60"
http://edis.ifas.ufl.edu/pi032
Unlike F1 tomato varieties, where there are numerous varieties with resistance to nematodes and many other pathogens, it appears that bean varieties with this resistance are much fewer. I'm guessing that the tomato market is a much more lucrative market than the bean market, thus the bean area attracts fewer breeders to the area or maybe creating pathogen resistant bean varieties is just more difficult.
Maybe Joseph or one of the other many very knowledgeable plant breeders, growers or gardeners here on Tomatoville could comment of this?
Thanks, Larry