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    Final presentation Final presentation Presentation Transcript

    • Assessment of Spider Families Clubionidae, Lycosidae & Theridiidae as Potential Biocontrol Agents of Brassica Pests Madaline Healey
    • Project Aim
      • “ to determine the potential of Clubionidae, Lycosidae and Theridiidae to control
      • Plutella xylostella,
      • Crocidolomia pavonana &
      • Myzus persicae
      • in Brassica vegetable crops….”
    • Brassica Vegetable Pests
      • Diamondback moth
      • Plutella xylostella
      • Cabbage Cluster Caterpillar
      • Crocidolomia pavonana
      • Green Peach Aphid
      • Myzus persicae
    • Brassica Vegetable Pests
      • Diamondback Moth
      • P. xylostella
      • Cabbage Cluster Caterpillar
      • C. pavonana
      • Green Peach Aphid
      • M. persicae
      Diamondback larvae damage
    • Brassica Vegetable Pests
      • Diamondback Moth
      • P. xylostella
      • Cabbage Cluster Caterpillar
      • C. pavonana
      • Green Peach Aphid
      • M. persicae
      Cabbage cluster larvae damage
    • Brassica Vegetable Pests
      • Diamondback moth
      • Plutella xylostella
      • Cabbage cluster caterpillar
      • Crocidolomia pavonana
      • Green Peach Aphid
      • M. persicae
      Green peach nymph damage
    • Background
      • Chemical resistance
      • South East QLD Lockyer Valley survey
        • 70% utilise IPM
        • 30% consciously protect natural enemies
      • Spider dominant natural enemy in Brassica vegetables
    • Spiders in Brassica Vegetables
        • Clubionidae
        • -hunting plant dweller
        • Lycosidae
        • -hunting ground dweller
        • Theridiidae
        • -tangle web-weaver
    • Spiders in Brassica Vegetables
        • Clubionidae
        • - hunting plant dweller
        • Lycosidae
        • -hunting ground dweller
        • Theridiidae
        • -tangle web-weaver
    • Spiders in Brassica Vegetables
        • Clubionidae
        • -hunting plant dweller
        • Lycosidae
        • - hunting ground dweller
        • Theridiidae
        • -tangle web-weaver
    • Spiders in Brassica Vegetables
        • Clubionidae
        • -hunting plant dweller
        • Lycosidae
        • -hunting ground dweller
        • Theridiidae
        • -tangle web-weaver
    • Spiders in Brassica Vegetables
        • What impact will these spiders have in reducing pests?
    • Objectives
      • determine the ability of three spider families to reduce pest populations
      • determine if a connection exists between spider and prey preference
      • determine spider predation potential as a naturally occurring biocontrol agent in Brassica vegetables
    • Laboratory Experiments
      • Exp 1
      • No choice Lepidoptera predation
      • Diamondback & Cabbage cluster
      • Five larvae per trt
      • Six trts, 2 controls
      • Consumption after 24 hours
      • Exp 2
      • Lepidoptera prey preference
      • Diamondback & Cabbage cluster
      • One larva of each prey
      • Three trts, one control
      • First prey attacked
      • Exp 3
      • Lepidoptera prey preference
      • by Lycosidae
      • Diamondback & Cabbage cluster
      • One larva each prey
      • One trt, one control
      • First prey attacked
      • Exp 4
      • Prey species preference
      • Cabbage cluster & Aphid
      • One larva each prey
      • Three trts, one control
      • First prey attacked
    • Experimental Collection
      • Colonies
        • Diamondback moth
        • Green peach aphid
      • Organic broccoli plantings
        • Spiders
        • Cabbage cluster egg rafts
      Cabbage cluster egg raft
    • Experimental Arena Caged arena with broccoli seedling
    • Experiment One Lepidoptera predation
      • Two-factor ANOVA
      • No significant difference between prey mortality
      • P = 0.715
      • No interaction
      • P = 0.195
      • Spider families will
      • readily predate both
      • prey
      • No significant difference between treatments
        • LSD = 1.361
    • Experiment Two Lepidoptera prey preference
      • Chi-square analysis
      • Significant prey preference
        • Clear choice of prey dependant on spider type
        • χ ² = 0.010
      • DBM – Diamondback moth
      • CCC – Cabbage cluster
    • Experiment Three Lycosidae prey preference
      • Chi-square analysis
      • No significant prey preference
        • Prey choice independent of spider type
        • χ ² = 0.157
    • Experiment Four Prey species preference
      • Chi-square analysis
      • No significant prey preference
        • Prey choice independent of spider type
        • χ ² = 0.117
      • CCC – Cabbage cluster
      • GPA – Green peach aphid
    • General Discussion
      • All spider treatments will consume three Brassica pests
        • Generalist predator more effective than selective
      • Prey preference
        • Physical and behavioural characteristics
          • Diamondback larvae active
          • Cabbage cluster larvae sluggish
          • Green peach aphid nymphs passive
    • Future Research
      • Repeat experiments
        • increase experimental
      • units
      • Lycosidae on plant
    • Future Research
      • Cage exclusion
      • trials
      • Spider thresholds
        • No. spider per metre ²
      Semi-excluded cage
    • Summary
      • Clubionidae, Lycosidae & Theridiidae will predate
      • Plutella xylostella
      • Crocidolomia pavonana
      • Myzus persicae
      • Potential naturally occurring biological control agent
    • Acknowledgements
      • Dr. Graham Brodie
      • University of Melbourne
      • Dr. Lara Senior
      • Agri-Science Queensland
      • Ms. M. Firell
      • Agri-Science Queensland