{"id":2740,"date":"2019-05-17T00:04:28","date_gmt":"2019-05-17T07:04:28","guid":{"rendered":"https:\/\/depts.washington.edu\/hortlib\/pal\/pal-question-534\/"},"modified":"2024-11-26T13:46:23","modified_gmt":"2024-11-26T21:46:23","slug":"diseases-affecting-beans","status":"publish","type":"pal","link":"https:\/\/depts.washington.edu\/hortlib\/pal\/diseases-affecting-beans\/","title":{"rendered":"diseases affecting beans"},"content":{"rendered":"

I have grown runner beans in the center of England for<\/strong>
\nseveral years, with good crops and healthy plants, but this year my<\/strong>
\nplants have some sort of disease. The leaves have brown spots which seem<\/strong>
\nto spread along the leaf veins and then over the whole leaf. Some plants<\/strong>
\nare still producing healthy beans, but on some plants the beans have shrivelled<\/strong>
\nand turned yellow. I don’t know if these are the same plants with the<\/strong>
\nworst leaf problems as the plants are tangled together too much. I have<\/strong>
\nlooked at various websites, but am not sure that any diseases shown<\/strong>
\ncorrectly match my problem. I would be very grateful if you have any<\/strong>
\nidea as to what it is and how to deal with it.<\/strong><\/p>\n

 <\/p>\n

While I cannot diagnose the problem remotely, your description does sound
\nquite a bit like anthracnose, which is a fungal disease. According to The
\nOrganic Gardener’s Handbook of Natural Insect and Disease Control<\/em> by
\nBarbara Ellis (Rodale Press, 1996), this disease thrives in wet, humid
\nconditions. You would see leaves with dark streaks, and black petioles
\nand veins on the underside of the leaves. If this is indeed the problem,
\nplants may be sprayed with sulfur, or you can seek out resistant
\ncultivars next time around (‘Espada,’ ‘Marbel,’ Morgane,’ and ‘Rocdor’
\nare a few).<\/p>\n

On the other hand, the yellowing of the seed pods sounds more like
\nbacterial blight, also encouraged by warm, damp weather. If your plants
\nare not forming any new pods, remove and destroy them. Next time you
\nplant, be sure there is adequate space between plants, and perhaps
\nrotating the crop to a different location might help.<\/p>\n

Just to give you some basis of comparison, here are links to sites with
\ninformation about diseases affecting beans:<\/p>\n

Cornell University Vegetable MD Online<\/a><\/p>\n

University of California, Davis Integrated Pest Management<\/a><\/p>\n

Royal Horticultural Society lists several problems<\/a> affecting runner beans. There is a fungal disease of broad beans called chocolate spot<\/a> which sounds a little like what you describe.<\/p>\n","protected":false},"excerpt":{"rendered":"

I have grown runner beans in the center of England for several years, with good crops and healthy plants, but this year my plants have some sort of disease. The leaves have brown spots which seem to spread along the leaf veins and then over the whole leaf. Some plants are still producing healthy beans, but on some plants the beans have shrivelled and turned yellow. I don’t know if these are the same plants with the worst leaf problems…<\/p>\n

Continue reading diseases affecting beans<\/span><\/a><\/div>\n","protected":false},"author":4,"featured_media":0,"menu_order":0,"template":"","keyword":[643],"class_list":["post-2740","pal","type-pal","status-publish","hentry","keyword-beans-diseases-and-pests"],"acf":[],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal\/2740"}],"collection":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal"}],"about":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/types\/pal"}],"author":[{"embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/users\/4"}],"wp:attachment":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/media?parent=2740"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/keyword?post=2740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}