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Soybean Insect Identification and Management Agent Training June 26-27 NCSU and Plymouth, NC.

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Presentation on theme: "Soybean Insect Identification and Management Agent Training June 26-27 NCSU and Plymouth, NC."— Presentation transcript:

1 Soybean Insect Identification and Management Agent Training June 26-27 NCSU and Plymouth, NC

2 Plant Injury ChewingPiercing-sucking

3 Insect Mouthparts

4 Plant Injury Gall makingInsect Vectors

5 Injury vs. Damage Injury: harm or destruction on the host plant caused by the pest Damage: measurable loss of the host that affects the yield quantity, quality or aesthetics

6 Old vs. New Injury OldNew

7 Economic Injury Level EIL: the lowest number of insects that causes economic damage C = Cost of management per unit area V = market value per unit of product I = Injury units per insect per production unit; expressed as a proportion D = Damage per unit injury K = proportionate reduction in potential injury or damage

8 Economic Threshold ET = the number of insects that triggers a management action

9 Corn Earworm/Tobacco Budworm Thresholds now online! Will lead to Field Crop Entomology Webpage Link Click Soybean Insect Pests Click Corn Earworm Click CEW Threshold Calculator for SoybeansCEW Threshold Calculator for Soybeans


11 Sampling and Monitoring Methods

12 Direct Sampling Transect Random Sampling

13 Seedling Pests Thrips Grasshopper/Katydid Bean Leaf Beetle Cutworm Threecornered alfalfa hopper Lesser cornstalk borer

14 Thrips Tobacco thrips predominate after planting, then soybean thrips Some Eastern flower thrips, very few Western flower thrips

15 White Margined Burrower Beetle

16 Grasshoppers Most common in reduced till Adults more difficult to kill

17 Katydid

18 Bean Leaf Beetle

19 Cutworm

20 Threecornered Alfalfa Hopper Check when beans are less than 10 inches tall Threshold is one per sweep

21 Threecornered Alfalfa Hopper Injury

22 Stem Borers Lesser cornstalk borer Dectes stem borer

23 Lesser Cornstalk Borer

24 Dectes Stem Borer

25 Vegetative/Flowering Stage Pests (after seedling stage) Defoliators – Corn earworm/tobacco budworm – Armyworm complex – Soybean looper (generally late-season) – Green cloverworm (generally NOT a pest) – Velvetbean caterpillar (generally late-season) – Bean leaf beetle – Japanese beetle – Blister beetle – Grape colapsis – Spider mites – Whitefly

26 Corn Earworm/Tobacco Budworm

27 Armyworm Complex


29 Soybean Looper

30 Green Cloverworm Generally NOT a pest

31 Velvetbean Caterpillar Four pairs of prolegs

32 Japanese Beetle Beetles often congregate Damage lacy Usually sub-economic

33 Blister Beetle

34 Grape Colaspis

35 Spider mites

36 Whitefly

37 Defoliator Thresholds Vegetative stages – 30% defoliation Two weeks prior to bloom and during pod-fill – 15% defoliation

38 Vegetative/Flowering Stage Pests (after seedling stage) Piercing sucking pests – Kudzu bug – Brown stink bug – Green stink bug

39 Kudzu Bug


41 Stink Bug Complex


43 Green Stink Bug Nymph

44 Brown Stink Bug Nymph

45 Piercing/sucking like Kudzu bug However, stink bugs prefer and damage pods

46 Common Beneficial Insects Ladybird beetle Lacewings Minute pirate bug Bigeyed bug Nabids Spined soldier bug Praying mantis

47 Ladybird Beetle adult larva eggs

48 Common NC ladybird beetles pink spotted Asian pink spotted

49 Green Lacewing larva eggs adult

50 Minute Pirate Bug

51 Bigeyed Bug

52 Nabis (damsel bug)

53 Spined Soldier Bug

54 Praying Mantis

55 Reproductive Stage Pests Defoliators – Soybean looper – Armyworm complex – Bean leaf beetle Pod-feeders – Corn earworm/tobacco budworm – Stink bug complex Stem feeder – kudzu bug


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