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Soil insect pests of peanut
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Soil insect pests of peanut

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  • Alabama peanut production acres in 2008 = 191,000 acres; average state production = 3,300 lbs; total production = 630,000 lbs; value of crop = $73 million (2007 prices)
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    • 1. Scouting and Management Challenges for Soil Insect Pests of Peanut Ayanava Majumdar Extension Entomologist, ACES Gulf Coast Research and Extension Center 8300 State Hwy 104, Fairhope, AL 36532 Email: [email_address] Cell phone: 251-331-8416 Fax: 251-990-8912
    • 2. What attract insects to peanut pods? Insect types: Foliar insects Soil-air interface Exclusively soil dwelling CO 2 HEAT EXUDATES
    • 3. Burrower bugs
      • Host range: peanut, cotton, strawberry, spinach, wild plants
      • Identification: note wing structure, scutellum, & spines on legs
      • Damaging stages: adult, nymph
      • Mouthparts are inserted into maturing kernel
      • Cause light yellow/brown feeding spots OR “pitting”
      • Loss in kernel weight and no. of sound kernel
      • Increasing problem in conservation tillage systems
      Hemiptera: Cydnidae
    • 4. Scouting techniques (burrower bugs)
      • ET = 2 bugs per three feet row
      • Monitoring period: July – Aug.
      • Direct examination of pods (after the full seed, R6, stage)
      • Underutilized techniques: spade sampling/soil corer ? , light trap ? , pitfall trap √
      Pitfall trap with metal guide & cover Spade sampling
    • 5. Southern corn rootworm
      • Host range: 200 host plants, major pest of corn, sweet potato, peanut
      • Identification: wing pattern on adult beetles, larvae have 3 pr of legs
      • Damaging stage: larvae
      • Stand loss (early season damage)
      • Larvae make a hole on one side of the pod and feed on kernel
      • High OM, heavy soil >> high risk
      Coleoptera: Chrysomelidae
    • 6. Scouting techniques (southern corn rootworm)
      • ET: fresh damage evident OR larvae present in 1/3 rd sites
      • Electronic risk index by NCSU >> high risk (score 70+) in wet years, low risk (score <50) in well-drained soil
      • Larval infestation – scout close to pegging stage
      • Sweep net sampling for adults is reliable (10 sweeps/10 paces X 5 loc./A)…midmorning
      • Check pods for circular holes at one side (asymmetric)
    • 7. Lesser cornstalk borer
      • Occurrence: one of the major insect pests of peanut, sporadic
      • Host range: wide, hot-spots in peanut
      • Identification: larvae are blue-green with purple bands. Moths are grayish.
      • Larvae makes sand tubes on pods and stem (protection?)
      • Damaging stage: larvae feed just below soil surface
      • High risk to peanut in hot dry years, sandy soil
      • Worst of all… Aspergillus & aflatoxins
      Lepidoptera: Pyralidae
    • 8. Scouting techniques (lesser cornstalk borer)
      • ET – control when fresh damage is present OR when insect is recovered from 1/3 rd sample sites
      • Pod sampling – reliable indicator of infestation
      • Scouting maps available from AWIS website – based on the estimation of borer days on a scale of 0 to 5
    • 9. Wireworms
      • Host range: several plants (extended life cycle allows use of resources)
      • Identification: larvae with cylindrical body, wriggle furiously when touched, adults are click beetles
      • Damaging stage: larvae feed at various depths, major problem following sod
      • Saturated soil causes migration & spread
      • Make a large entry hole on one end
      Coleoptera: Elateridae
    • 10. Scouting techniques (wireworms)
      • Study field history – crop rotation, previous infestations
      • Germinating seed bait stations in soil – a reliable “relative sampling” technique
      • Seed baits could be deployed before planting peanut
      • Accuracy of seed baits improves with number of baits and experience of the field personnel
      • ET = 1 wireworm per bait station OR 30% pod damage
    • 11. Whitefringed beetles
      • Occurrence: native of S. Am., Naupactus species complex
      • Host range: 350 host plants – peanut, cotton, cowpea, alfalfa, okra
      • Identification: weevil w/out snout, adult has white stripes on sides, larva plump with strong mandibles
      • Damaging stages: larvae/grubs
      • Larvae make irregular holes in tap root, fatal to plants
      • Scouting: sweep net for beetles, leaf notching (visual scouting)
      • No insecticide registered
      Coleoptera: Curculionidae
    • 12. Cutworms
      • Host range: over 60 crops and turf, major pest of peanut
      • Identification: greasy plump caterpillars, larvae curl when touched
      • Overwintering stage: larva
      • Damage:
        • cut seedlings at night, may climb plants
        • larvae bore into the middle of peanut pod (large hole)
      Lepidoptera: Noctuidae Black CW Granulate CW
    • 13. Other sporadic insect pests White grubs ( Phyllophaga spp.) May/June Beetles 1-4 year life cycle Problem after sod Bahiagrass borer ( Derobrachus brevicollis) Large head of larva Problem after bahiagrass
    • 14. Scouting recommendations
      • Draw soil samples in Winter or Spring.
      • Reduce tendency to overestimate – increase sampling locations/numbers!
      • Use a variety of sampling methods – pheromone traps and germinating seed bait stations are cost effective!
      • Economic thresholds:
      • Burrower bug = 2 bugs per 3 foot row
      • LCB, SCRW = fresh damage or insect at 30% sites
      • Wireworms = 1 per bait station or 30 % pod damage
    • 15. Management of soil insects (peanut)
      • Future research directions:
      • Extend registration of new insecticides
      • Focus on bio-based soil insecticides as IPM partner
      • Survey of all major production areas (2009)
      • Establish economic threshold for emerging pests
      Cutworms Indoxacarb Cyfluthrin Gamma-cyhalo. Lamdba-cyhalo. Methomyl Zeta-cypermeth. LCSB Chlorpyrifos (banded over row and pegging zone) SCRW Chlorpyrifos (banded over row and pegging zone) Wireworms Chlorpyrifos (preplant broadcast spray on soil + incorporate OR banded) Burrower bugs Chlorpyrifos (banded over row)
    • 16. New Peanut Entomology Resources
      • ACES Factsheets:
        • “ Soil insect pests of peanut”…coming soon
        • “ Scouting techniques for soil insect pests of peanut”…review complete
      • Timely Information sheets: ( http://www.aces.edu/timelyinfo/entomology/entomology.php )
        • “ Germinating seed bait technique” (posted)
        • “ Peanut insecticide recommendations for 2009” (posted)
      • New peanut entomology SharePoint: https://sites.aces.edu/group/crops/peanut/default.aspx (PowerPoint shows with narration)
      • Conferences (like IPM-WC1, extension technology conf.)
      • YouTube Peanut Channel linked to ACES
      • CropsBlog: weekly updates in summer, PLEASE SUBSCRIBE!
    • 17. Take home message for today…
    • 18. SOIL INSECT PESTS OF PEANUT Questions?

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