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2017 Soybean Insect Update 2017 Soybean Insect Update

2017 Soybean Insect Update - PowerPoint Presentation

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Uploaded On 2018-09-30

2017 Soybean Insect Update - PPT Presentation

Dominic Reisig NCSU Entomology and Plant Pathology Making Smart Insecticide Choices in Soybean Proper identification Numbers at threshold Choose the correct tool Proper Identification Corn ID: 683159

100 defoliation earworm soybean defoliation 100 soybean earworm corn prevathon identification true pick effective karate soybeans yield tobacco disadvantages threshold advantages proper

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Presentation Transcript

Slide1

2017 Soybean Insect Update

Dominic Reisig

NCSU Entomology and Plant PathologySlide2

Making Smart

Insecticide Choices in Soybean

Proper identification

Numbers at threshold

Choose the correct toolSlide3

Proper Identification

Corn

Earworm/Tobacco BudwormSlide4
Slide5
Slide6
Slide7

Corn Earworm

Risky

Pyrethroid

(

Baythroid

, bifenthrin, Karate, Mustang, Tombstone)

Advantages

Cheap (unless they flare), pick up some true bugs

Disadvantages

Resistance, not effective on many armyworms,

loopers

, tobacco budworms, kill many natural enemies

Safe

Caterpillar-specific

(Blackhawk, Intrepid Edge,

Prevathon

, Steward)

Advantages

Almost always effective, some residual, preserve

beneficials

Disadvantages

Initially pricey,

w

ill not pick up true bugsSlide8

Average mean % corn earworm moth survival, 5 µg cypermethrin- 2013-2016Slide9

Untreated

Belt

Prevathon

Karate +

Prevathon

(Besiege)

Number of predators per beat sheet sample

Work done during 2013-2015 in NC and VA by VA Tech student Dr. Rebecca WhalenSlide10

I don’t understand why I have worms…I already sprayedSlide11

Do multiple defoliation events

compound to reduce yield in soybeans?

V3 Defoliation

V6

Defoliation

 

0

33%

66%

100%

0

100%

97%

96%

77%

33%

105%

93%

88%

83%

66%

100%

95%

101%

92%

100%

86%

75%

79%

75%

Yield (% of UTC)

B.C. Thrash, A.

Catchot

, J. Gore, F. Musser,

D

. Cook, T. Irby, J.

Krutz

- MS StateSlide12

V4 DefoliationSlide13

Effects of Soybean Planting Dateon V4 Defoliation Damage StonevilleSlide14

Delays in MaturitySlide15

Conclusions

Do reproductive thresholds need to be adjusted based on defoliation that occurred during vegetative growth stages?

Probably

not

Later planted soybeans may need a lower treatment threshold to compensate for reduced leaf area recovery time