Runner Bean Pests and Problems
Runner beans are a great vegetable to grow thanks to the large harvest they can produce. Once the inital work of digging a trench and setting up supports has been done, it's just a case of watering them every day and waiting for nature to do its work. If you do encounter any problems though, have a look at the Q and A below for some help.
No beans being produced
I decided to fill the space left in my green
house with runner bean plants. They have grown very well, look healthy and are
flowering daily. But when the flower dies back it just drops off completely from
the main stalk leaving no bean. They are watered daily and the greenhouse door
is opened during the day for ventilation. I would be grateful for any advice.
This is not all that an uncommon problem. It is usually worse in hot and dry seasons, so it may be that your greenhouse is just too hot for the plants at the moment. You could try watering even more, mulching around the base of the plants to conserve what water you do give them, and opening all the ventilation in your greenhouse all of the time.
There is a chance that sparrows or bumblebees are actually destroying your flowers, but given that you are growing in a greenhouse I tend to think it is the extreme micro-climate which is causing your problems. If you want to grow beans in a greenhouse, a French climbing bean would probably be better; or you could try lots more moisture-retaining compost under the plants if you do the same with runner beans next year.
On the plus side you might just find that if you cut the runner bean down to the ground rather than pulling out the roots, and cover it with a thick straw mulch for the winter, it could come back next year - of course you might not want a runner that doesn't produce beans.
Not many beans
My runner beans this year have been splendid, lots of really healthy vigorous growth and the most flowers we have ever seen. Unfortunately very few of the flowers have become beans and although we have some beans its nothing like as many as we have had other years with about one tenth of the flowers.
The only different thing we did this year was to compost the bean site in January whereas before I am ashamed to say we left them pretty much alone. Apart from feeding once or twice with phostrogen, just the same as we have done other years. The flowers are just dropping.
Is it because they haven't been fertilized or is their something more sinister going on. We have seen quite a few wasps around the flowers this year.
Any advice would be appreciated.
Hi, if anything digging in compost should have helped your beans, and may be the reason why you have any beans at all. I guess - not knowing what your year has been like - that you have had a hot and dry time of it. Runner bean setting is always worse in such seasons.
Try to keep the plants better watered and don't forget that if even one bean on a plant reaches maturity that will be the end of flowering for that year. By the way, although sparrows and bumble bees are often implicated in the destruction of runner flowers, wasps are normally reckoned to be a gardener's allies until August.
We have bush green beans (Blue Lake variety ) and they are growing extremely well, large bushes and plenty of blooms ... some are beginning to become beans and all seems well except that the plant leaves are beginning to turn yellow. The plants are all fading yellow evenly and it seems like a soil deficientcy. So far the beans are still developing. What should I do ? By the way, I live in texas and I have been watering every other day for an hour or so. Thank you , Jim
Hi, Since the yellowing is uniform and in the older leaves(?) and you are watering a lot a possible deficiency which springs to mind is nitrogen. This can leach out of the soil and the leaves will turn yellow. The other possibility is mildew which can occur if there is too much humidity. Have you thought of mulching and hand watering at the roots only? Is it possible that you are under or over watering? Look at the roots for any signs of rotting (over-watering) and make sure that the water is able to drain away ok. Stick your finger in the soil-it should be damp,not wet. Also have a really good look for any pests lurking in the soil,under the leaves or under any nearby dead leaves etc.
There are a few blights which can affect green beans but yours sound basically healthy. Also the beans sound as if they are ok which is an important point! I think that the first thing I would do is to make sure the watering is right and that there are no obvious pests.
I have successfully grown four runner bean plants from seed and have planted them out into big pots with six foot canes. However, although they seem quite healthy and are growing the leaves have been eaten and I cannot see from what. Is there anything I can do to prevent further damage. The plants are still growing and have produced new shoots
Hi, The most likely suspects are slugs and snails. They will hide under pots and pot rims during the day and then come out to feast at night(especially when it is wet). To check out this theory have a really good look around the pots and the area around them. Look for places where the slugs and snails can hide. Little piles of leaves can shelter them. If there is any debris on the surface of the soil in the pots slugs and snails can hide under it. Slugs can also shelter just under the surface of the soil. If you find slugs and snails your best bet is slug traps, gravel around the pots and copper tape around the pots.
Hi, Do you pinch out growing tip at any time?
Pinch out the growing tips when the plant reaches the top of the canes.
1 Tomatoes flower and flower stems dying but plant in good health
2 Runner bean are setting flowers but plants are not climbing up canes. They are 4ft 6ins high [Aug 2015]
Can anyone advise please.
and no leaves,as if something has chewn them
off in the ground.Can you offer some advice
my green beans havealot of holes in them could u tell me if there is anything eating them they out in the garden not in a green house. and what should i do.
I am a first time grower of Runner Beans and although they are growing (very slowly it seams) the leaves are fading to yellow. Is this normal for beans? Should I be feeding them with anything?