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Flashcards

RHS Level 3 Pests 4

Alison Phillips RHS Level 3 A level English 24 cards

RHS Level 3 Pests 4

Cards in this deck (24)

  1. 1—Narcissus eelworm
    Ditylenchus dipsaci    Narcissus eelworm Ditylenchus dipsaci
  2. 2Narcissus eelworm DESCRIPTIONMicroscopic and worm-like. They are nematodes.
  3. 3Narcissus eelworm DAMAGEAffect a number of plants, so damage depends on species. However, in Narcissus, main damage is swelling soft bulbs, stunted and distorted growth, and malformed leaves and flowers, or may not grow at all. more noticeable toward end of growing season. Cut bulb and see brown rings of dead tissue. Daff leaves develop small green or yellow bumps (spickels).
  4. 4Narcissus eelworm CULTURAL CONTROLBuy firm, disease free bulbs from reputable buyers.
    If detected, remove affected plants and all other host plants within a one metre radius and burn (do not compost)
    Leave affected areas fallow for three years, removing all host plants
  5. 5Narcissus eelworm BIO CONTROLnone
  6. 6Narcissus eelworm CHEMICAL CONTROLSNo chemicals, but:
    Hot water treatment of dormant bulbs at 44.5 degrees for 3 hours.
  7. 7—Vine weevil
    Otiorhynchus sulcatus    Vine weevil Otiorhynchus sulcatus
  8. 8Vine weevil DESCRIPTIONLarvae:
    c-shaped white grubs with brown head. No legs. About 10mm
    Adults:
    Large-ish beetle, dark browny green with pale flecks. About 9 mm
  9. 9Vine weevil DAMAGEAdults eat notches in leaves spring and summer but worst damage is done in autumn and winter when larvae eat roots causing plants to weaken, wilt and die.
    Container plants fair worse. Many affected spp, e.g. Heuchera spp and Primula spp.
  10. 10Vine weevil CULTURAL CONTROLCheck for signs and adults frequently.
    Practise good hygiene to remove hiding places, e.g. leaf litter/ plant debris where they hide during the day.
    Inspect new plants.
    During repotting, look out for larvae, pick out and destroy.
    Encourage natural predators (birds, frogs, small mammals)
    Trap adults on sticky barriers around pots
  11. 11Vine weevil BIO CONTROLNematode: Steinernema kraussei. Water onto infected pots when temp is between 5-20 degrees, late August and early September and repeat in May
  12. 12Vine weevil CHEMICAL CONTROLSystemic: Neonicotinoid
    called acetamiprid (e.g. Bug Clear Ultra Vine Weevil Killer) as a liquid drench applied to the compost mid-late summer will kill larvae for 4 months can be applied to CONTAINERS only. Not edibles, or ornamentals in the ground. NB: Bug Clear is also a contact pesticide.
    Ppt says it’s no longer available, but it’s on RHS website and still available to buy!
  13. 13—Glasshouse White FlyGlasshouse White Fly
  14. 14Glasshouse White Fly DESCRIPTIONAdult is small white fly to 2 mm on underside of leaves in glasshouse. Nymphs (flat, oval, creamy white scale-like) and eggs also present.
  15. 15Glasshouse White Fly DAMAGEA sap-sucking insect. Reduces plant vigour.
    Excretes honeydew which causes sooty mould to grow and blocks UV required for photosynthesis. Many affected plants, e.g., tomatoes
  16. 16Glasshouse White Fly CULTURAL CONTROLYellow sticky sheets can help monitor and can reduce numbers if plants are regularly disturbed to cause them to fly up onto it.
    Inspect and quarantine new plants.
    Clean glasshouse to remove overwintering populations
    Handheld vacuums can remove adults.
  17. 17Glasshouse White Fly BIO CONTROLEncarsia formosa is a parasitic wasp that preys on the nymphs. Can be bought as parasitised scales attached to cards and hung in glasshouses March to Oct. If using, don’t use chemical pesticides!
  18. 18Glasshouse White Fly CHEMICAL CONTROLSYour general pesticides: Contact: organic natural pyrethrins such as Bug Clear Gun for Fruit and Veg
    Contact: Synthetic pyrethroids such as deltamethrin
    Systemic: Flupyradifurone (e.g. Provanto Smart Bug Killer)
    Repeat weekly two or three times.
    Also: glasshouse fumigants such as permethrin-based fumigant e.g., DeadFast Greenhouse Smoke Generator
  19. 19—Glasshouse Leafhopper
    Hauptidia maroccana    Glasshouse Leafhopper Hauptidia maroccana
  20. 20Glasshouse Leafhopper DESCRIPTIONAdult: 3mm long bug with grey and yellow markings. Broad head, tapering to tail. Jump short distances
    Larvae:
    Creamy white, wingless nymphs. It is the nymphs that feed on the leaves.
  21. 21Glasshouse Leafhopper DAMAGEA sap-sucker.
    Cause coarse white mottling of the upper leaves. In severe attacks, leaves can be completely blanched, however, low numbers can be tolerated. Affected plants: Primula malcoides, tomatoes, foxgloves, fuchsias and many others.
  22. 22Glasshouse Leafhopper CULTURAL CONTROLRemove older affected leaves and destroy
    Ensure good plant and work space hygiene Clear away debris that can harbour eggs
  23. 23Glasshouse Leafhopper BIO CONTROLParasitic hymenopteran (bee and wasp family): Anagrus atomus is available commercially.
    herbs.ahdb.org.uk/b1-leafhopper/
    PPt says none available (though ahdb and book say yes)
  24. 24Glasshouse Leafhopper CHEMICAL CONTROLYour general pesticides: Contact: organic natural pyrethrins such as Bug Clear Gun for Fruit and Veg
    Contact: Synthetic pyrethroids such as deltamethrin
    Systemic: Flupyradifurone (e.g. Provanto Smart Bug Killer)

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Description
A level RHS Level 3 Flashcards on RHS Level 3 Pests 4, created by Alison Phillips on 09/01/2022.
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Alison Phillips
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