Hello all, It is worth giving a warning about this pest which is very active at this time of year on warm, sunny days and is more common than generally appreciated. It would be much better named 'amaryllid fly' because it is not fussy about the genera it attacks. Usually, by the time the grower is aware that the bulbs are in trouble the culprit is long gone and the cause is often mistakenly attributed to bulb-rot. Always cut open soft or rotted bulbs to see if they have been eaten from within. You may even find the grub still in residence. For those unfamiliar with this pest, the large narcissus fly is a master of disguise which cleverly mimics the honey-bee complete with the loud 'buzz'. But there is an easy way of identifying it; the honey bee is ALWAYS looking for flowers and pollen but the narcissus fly never does. So, if you see a lazy 'bee' sunning itself or resting on a leaf it is probably a narcissus fly. The fly (it is a true fly) overdoes the buzzing effect and is louder than a wasp or bee and the ear soon becomes attuned to it. At rest the honey bees wings are held parallel along its back but the fly holds its wings in the typical 'V' shape of a bluebottle or house fly. I've recently seen a Blackbird snatch a narcissus fly so let's hear it for the Blackbirds. Happy hunting. Den Wilson Isle of Wight UK. Zone 8 (maritime) almost frost-free.