Pests and diseases of roses

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Aphid Macrosiphum rosae feeding on buds and shoots
Rose rust
Two-spotted mite Tetranychus urticae on Gardenia spp.
Bristly Roseslug Cladius difformis on underside of leaf
Cottony cushion scale Icerya purchasi
Leaf damage caused by Leaf cutting bee Megachile sp.
Meloidogyne sp. nodule damage to roots.
Flea beetle Aphthona flava

Roses (Rosa sp.) are susceptible to a number of pests, diseases and disorders. A large number of the problems affecting roses are seasonal and climatic.[1] Certain varieties of roses are naturally more resistant or immune than others to certain pests and diseases. Cultivation requirements of individual rose species and cultivars, when observed, often assist in the prevention of certain pests, diseases and disorders.[2]

Pests[edit]

Insects that affect roses are often considered pests.

Cottony cushion scale (Order Hemiptera : Family Coccoidea) Icerya purchasi – This scale infests twigs and branches. The mature female is oval in shape, reddish-brown with black hairs, 5 mm long. When mature the insect remains stationary and produces an egg sac in grooves, by extrusion, in the body which encases hundreds of red eggs. The insect causes little damage but produces copious honeydew (frass) that can cause damaging sooty mould.
California red scale (Order Hemiptera : Family Coccoidea) Aonidiella aurantii – A hard scale, orange to orange-pink, the female covering being less than 1.5mm across. Often in plague numbers this scale infests upper surfaces of foliage causing yellowing, leaf fall, and twig and branch dieback. Serious infestations can cause plant death.
Rose scale (Order Hemiptera : Family Coccoidea) Aulacaspis rosae – Mainly found on the stems and branches of the plant, lack of control will allow the pest to spread to flower stalks and petioles. At this point the plant would be stunted, spindly and with a white, flaky crust of scales on the bark. Female Aulacaspis rosae may live for 1 year and may lay 80 eggs each with several overlapping generations living within milliimetres of the original parent.[4]
Root-knot nematode Meloidogyne spp.
See - Root-knot nematode - symptoms of Meloidogyne infestation in roses is stunting, slow-growth, pale green leaves and wilting in mild weather.[2]

Diseases[edit]

Fungal, bacterial and viral diseases that affect roses:

Fungal diseases[edit]

Anthracnose Sphaceloma rosarum on R.rugosa

Viral diseases[edit]

Rose mosaic virus on R. "Queen Elizabeth"

Bacterial diseases[edit]

Crown gall rot Agrobacterium rhizogenes

Environmental disorders[edit]

Hoar frost on Rosa sp.

References[edit]

  1. ^ a b Ross, D.,Rose-growing for Pleasure, Lothian Publishing, Melbourne, 1985, ISBN 0-85091-181-8 pp. 27
  2. ^ a b Botanica's Organic Gardening, Random House Publishing, Sydney, 2002, ISBN 1-74051-426-2
  3. ^ a b Ross, D.,Rose-growing for Pleasure, Lothian Publishing, Melbourne, 1985, ISBN 0-85091-181-8 pp. 28
  4. ^ a b c d e McMaugh, J. What garden pest or disease is that?, New Holland Publishing, Sydney, 2001
  5. ^ a b Baldo's Sacramento Rose Society Website: Rose Sawflies
  6. ^ Baker, J.R. "Rose Chafer". Insects and Related Pests of Shrubs. North Carolina State University. Retrieved 2009-01-19. 
  7. ^ Sweir, S. "Beetles on Ornamental Plants". University of New Hampshire Cooperative Extension. Retrieved 2009-01-19. 
  8. ^ Macoboy, S., Macoboys' Roses, Mallon, Melbourne, 1999, ISBN 1-875696-00-8
  9. ^ Canker of Rose
  10. ^ A discovery 70 years in the making: Characterization of the Rose rosette virus
  11. ^ The Biology of Rose Rosette Disease: A Mite-associated Disease of Uncertain Aetiology
  12. ^ a b U. Illinois Reports on Plant Diseases No. 666 - Rose Rosette Disease
  13. ^ 6. Ohio State BYGL October 8, 2009 DISEASE DIGEST. THE TWISTED STORY OF ROSE ROSETTE DISEASE
  14. ^ Ross, D.,Rose-growing for Pleasure, Lothian Publishing, Melbourne, 1985, ISBN 0-85091-181-8 pp. 26