Posted: 22/07/2014 at 19:25
My pennyworth: Flowers dropping during hot, dry weather is common...misting on hot days can be beneficial.
Runner beans reach their peak of production when the nights get cooler, usually in another month or so...which is why I sometimes wonder why people sow the seed so early in the year, when they run the risk of losing them to late frosts.
Birds do peck-off the flowers, but this seems to be more prevalent with red flowered varieties and I haven't known it to be a big problem.
I would definitely recommend growing the white flowered variety 'White Lady'. These are proven to set well in hot weather, are less attractive to birds and have a superb taste & are stringless.
I'm on commission. btw.