"Galle de collet" ! i suppose

It could be Crown gall, but needs to be confirmed

But I dought it if it did not have affect the yield

Hi: These galls can be formulated by bacteria (Agrobacterium) or by same kind of insects, but it seem like bacteria .

I dont think is a big problem 

thank you very much

Yes it's probably crown gall caused by Agrobacterium tumefaciens on common bean. I have got it through sheep manure as I was willing to try manure in comparison with compost. Now it's clear that compost is free of pathogens and it has to be confirmed by analysis, and given by the compost producers as a proof of compost quality.

But What you should do now, is to rogue all the infected plants and burn them. keep an eye on your crop, and whenever you spot and infected plant you do the same thing

Good luck

Callus can result from insect galling for example fly larvae. If so they can be detected in the center of the gall. That should be eliminated before anything else is considered.

If you continue to suspect Agrobacterium the bacteria should be isolated identified and confirmed and Koch's postulates completed by re-isolation and the regeneration of the symptoms in test plants with a re-isolation of the causal agent.

From experience in Puerto Rico this condition is rare in frequency but not uncommon. As such I agree that rogueing plants is the best management tool.

The Agrobacterium would need a wound inoculation in order to infect test plants abrasion with carborundum or pin point is often used.

Generally a high initial inoculum level is needed exp6 to exp9 per ml.

Good Hunting.

It will seem strange to you but the infected plants were more productive than the others. I have also a root knot nematodes (Meloidogyne ssp) attacks. I got 28T/ha of yield with 25 T/ha of sheep manure rate. There was a positive correlation between the manure rate, yield, the crown gall incidence and galling index of root knot nematodes. I should remind that the trial was conducted in compliance with organic agriculture rules under tunnels.

Dear Khalid Azim,

See the publication Mnasri et al. 2007. Rhizobium gallicum as an efficient symbiont for bean cultivation. Agron. Sustain. Dev. 331-336.

Strain 8a3 gives stem and root nodulation and the growth of shoots increase two times over infected control plants. This sounds like what you are experiencing.

With this type of response, I would encourage you to develop a team approach to confirm your discovery. These efforts should be made to ensure the collection of the bacteria is confirmed the diagnosis with physiological and genetic blast identification tests. The development of a collection of strains. And the development of lab, greenhouse and field confirmation of efficacy responses.

Indeed it would be very helpful for your Morocco agriculture and the World. Garden beans are usually not responsive to inoculation with Rhizobium and if this has that good of Nitrogen fixation rate would be a great boon. In addition the nodules aboveground are a wonderful indicator of the symbiotic condition which in this case would be more than desirable.

If there are ways I might be helpful let me know.

Sincerely, Paul Reed Hepperly

Considering the need to bolster fresh protein high vegetables to complement our crop starch diets this is very important.

I would encourage you to continue work with colleagues to validate and make useful this discovery.

Fascinating.

Organic agriculture regulations refrain from using manure. Compost should instead be used. In my experience, when composted material of any source is not handled carefully (for instance when left in open field after mature), it can be contaminated and become a source of nematodes and root pathogens in the crop it is used. Regards.

Yes, it could be gall-forming parasites (apply acaricides or insecticide) or it can be bacteria (Agrobacterium). Some fungicides are active against bacteria also.

However, eradicative treatment should be in consensus with costs of the yeald.