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Variations in Seed Production and the Response to Pests of Morningglory (Ipomoea) Species and Smallflower Morningglory (Jacquemontia tamnifolia)

  • R. Hugh Crowley (a1) and Gale A. Buchanan (a2)

Abstract

Flowering dates, seed production, and disease and insect susceptibility of seven Ipomoea spp. and smallflower morningglory [Jacquemontia tamnifolia (L.) Griseb.] were determined under field conditions in 1973 and 1974. Seed produced per plant were as follows: ivyleaf morningglory [Ipomoea hederacea (L.) Jacq.], 6000; entireleaf morningglory [I. hederacea (L.) Jacq. var. integriuscula Gray], 5000; pitted morningglory [I. lacunosa L.], 10000; wild tall morningglory [I. purpurea (L.) Roth.], 26000; commercial tall morningglory [I. purpurea (L.) Roth ‘Crimson Rambler′], 15 000; cypressvine morningglory (I. quamoclit L.), 9000; cotton morningglory [I. trichocarpa Ell. var. torreyana (Gray) Shinners], 9000; palmleaf morningglory (I. wrightii Gray), 7000; and smallflower morningglory, 11000. Seed weights were about 29, 26, 22, 21, 19, 13, 19, 37, and 5 mg/seed, respectively. Pitted morningglory appeared to have a qualitative short day-length requirement for flower initiation and the other species appeared less day-length sensitive. Ivyleaf morningglory and entireleaf morningglory were highly susceptible to orange rust [Coleosporium ipomoeae (Schw.) Burrill] and white rust [Albugo ipomoea panduratae (Schw.) Swingle], but the other Ipomoea species were only slightly susceptible and smallflower morningglory was resistant. Cotton bollworms (Heliothis zea Boddie) and cabbage loopers (Trichoplusia ni Hubner) fed preferentially on ivyleaf morningglory and entireleaf morningglory.

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References

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Keywords

Variations in Seed Production and the Response to Pests of Morningglory (Ipomoea) Species and Smallflower Morningglory (Jacquemontia tamnifolia)

  • R. Hugh Crowley (a1) and Gale A. Buchanan (a2)

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