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Hi folks,
I know it is summer in the North and deep thoughts will be furtherest from your mind but as you dig and plant you might like to ponder this question.
Observations:
A few year’s ago I had a patch of seedlings that had been down for a few years. As I lifted them I noticed that some cultivars were riddled with bulb fly and some had none. Interesting I thought.
Last season my yellow trumpets were poor. On planting this year I noticed that some cultivars had evidence of previous bulb fly and this season’s live larvae. Other cultivars had no evidence of fly at all.
This question then could well be a good topic for a PhD student to test.
Are some narcissus cultivars unpalatable to the narcissus bulb fly? Is there a common cultivar in the genealogy of these cultivars that leads to bulb fly resistance? Have any of you got anecdotal evidence that may support this theory?
I generally live with bulb fly and resist using chemical control where possible so finding larvae is not uncommon here.
David Adams.
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David, Years ago I had the same observations. I don’t think I ever had a bulb fly in any jonquil hybrids. These were planted in the beds with all the other varieties. At that time I attributed it to the smaller more rounded foliage. Bill Pannill