In the commercial trade here in Holland they use a
warm water treatment to get rid of the big narcissus
fly (Merodon equestris). After digging the bulbs they
soak them for 2 hours in warm water (43.5 C) this
kills the larva of the big narcissus fly.
The small narcissus fly (Eumerus strigatus) does not
do much harm to healthy bulbs.
Regards,
Ton
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