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adult flies affected bulbs appear areas attack by Bulb bait base plate beds BELFAST Bulb Eelworm bulb land Bulb Mite Bulb Scale Mite bulbs become Bulletin cissus colour commercial growers considerable Control Measures crop cultivation cyanide damage destroyed early eelworm attack eelworm-infested effected egg-laying feed field flower bud flower stems Fly larvae foliage FORCED BULB forcing houses formaldehyde frequently fumigation ground growing bulbs growth healthy bulbs heat host plant hot-water treatment hypopi Immersion of Bulbs inch in length infested bulbs Infested Soil injury known large numbers Leaf and Bulb loss Merodon larvae Metaldehyde narcissus bulbs Narcissus Fly narcissus pests oviposit pair patches period Plantain practice presence of Bulb present resembling result Ribwort Plantain slugs Small Bulb Flies species spickels spray spread stage stocks strigatus subsequent Symptoms of Attack Syritta pipiens Syrphidae temperature tion treated treatment of bulbs tubercles usually varieties weeks whilst York House