A MultiA Multi--Tactical Approach for Tactical Approach for A MultiA Multi Tactical Approach for Tactical Approach for Managing Tarnished Plant BugsManaging Tarnished Plant Bugs

Scott Stewart, UT Extension, andthe Midsouthern Entomology Teamthe Midsouthern Entomology Team

Some Midsouth FactsTarnished Plant Bug

Currently about 2,000,000 acres of cotton in LA MS AR cotton in LA, MS, AR, TN, MO◦ 700,000 acres in the

h hot zone

2009 Stats for TPB◦ 103,391 bales lost ,

(≈ $33 Million)

◦ Insecticide costs (≈ $49 Million)( $ )

Using multiple control t ti i i ll tactics is especially

important in the hot zone

We know what the problem is …p High and sustained populations of TPB◦ Insecticide resistance (Dr Snodgrass’ presentation)◦ Insecticide resistance (Dr. Snodgrass presentation)

Increased insect control costs◦ Yield loss◦ Secondary pests outbreaks (e.g., spider mites)◦ Insecticide resistance (plant bugs, cotton aphid, others)

5 Applications:pp1700 lbs

vs.700 lb700 lbs

So is there an answer?So is there an answer?

Improved decision makingImproved decision making◦ Better sampling methods and thresholds◦ Improve the timing of insecticide applications

Cultural controls and other non-insecticidal approachesinsecticidal approaches◦ Dr. Cook’s presentation◦ Managing for earliness, variety selection, management g g y g

of non-crop habitats, farmscaping, etc.

The better use of insecticides

Regional Research Pl t Bon Plant Bugs

SamplingTh h ld Thresholds

Efficacy trials Alternative approachesAlternative approaches

These publications are available …

Plant Bug Sampling & ThresholdsPlant Bug Sampling & ThresholdsMaking Our Decisions with More Confidence

Crop Stage Per 100 Sweeps Per Drop Cloth

First 2 weeks of squaring 8+ 1 (0.2 per foot)

Third week to first bloom 15+ 2 (0.4 per foot)

After first bloom 15+ 3 (0.6 per foot)*

Maintain 80% or higher square retention prior to bloom

Using Insecticides Betterg

Products New insecticides (Dr. Akin’s presentation)

Rates

Use patterns Tank mixes and rotations consideration for other pests Tank mixes and rotations, consideration for other pests,

insecticide resistance management (IRM)

Application Application Nozzle selection, aerial vs. ground, site specific scouting

and treatmenta t eat e t

Size matters …sometimes even i i i lik ki i iwinning is like kissing your sister

30TPB

25Not Treated Centric (2 oz)

Ft

TPB

15

20

/ 5 R

ow F

Even a good treatment can “fail”

10

Num

bers

/

40%Control

80%Control

0

5N Control

0

5 DAT1 6 DAT2 (11 DAT1)

Tennessee, 2010

Product Selection and Rate MatterTennessee August 2010

TPB

Tennessee, August, 2010

4 DAT2 (8 DAT1)

w F

t

TPB

10

12

s / 1

0 R

ow

6

8

Num

bers

2

4

0

Fanfare 3 Fanfare 4 Fanfare 6 Acephate 6 Acephate 9 Acephate 16

ab a ab bc c c

Check = 28 per 10 Row Ft (4 DAT1) and 49.3 per 10 Row Ft (4 DAT2)

No. of TPB - Regional TPB Efficacy TrialAveraged Across Five Locations 2009Averaged Across Five Locations, 2009

a16

18TPB

6 10 DAT 2

w F

t

a

12

146-10 DAT 2

rs /

10 R

ow

cd

b

bc bcd bccd bcd bcd

bc8

10

Num

ber cd

d

2

4

6

0

2

Yield - Regional TPB Efficacy TrialTennessee 2010 (4 Applications)

Lint1400

1500

Tennessee, 2010 (4 Applications)cr

e 1200

1300

1400

ound

s / A

c

900

1000

1100

Po

700

800

900a a a a a a ab bc bc bc c d

500

600

Tank Mixing Insecticides6 DAT2, Tennessee, 2010

15

20

TPB Green Stink BugsTPB

10

15

0 R

ow F

t

Bollworms on drop clothsPyrethroid = 4No pyrethroid = 15

5

10

umbe

r / 1

0

0

Nu

Untreated  Baythroid XL      1.9

Dimethoate      6

Bayth. XL 1.9      + Bidrin 2

Karate 1.9       + Dimeth. 6

Rotate ChemistriesJ ff G MSU

TPB 25

Jeff Gore, MSU

Feet

20Orthene-Untreated-OrtheneOrthene-Orthene-OrtheneOrthene-Centric-Orthene

/ 6

Row

F

10

15

Nym

phs

5

0

Shorten Spray Intervals vs. High PressureJeff Gore, MSU

TPB 23 100254 Days 5 Days 6 Days 7 Days

Re-treatment interval:

ow F

eet

60

80

15

20m

ent Perc

No. of TPB 4 DAT with Orthene

mph

s / 6

R

8

20

40

60

5

10

Pre

-trea

tm

centN

ym

0

20

0

5

Pre-Test Counts Percent ControlPre-Test Counts Percent Control

Nozzle Effects on Tarnished Plant Bug Control with Acephate 90S (0 5 lb),Tennessee, 2006with Acephate 90S (0.5 lb),Tennessee, 2006

16

18TPB

12

14

16

Feet

7.7 7.76.7

6.0 5 78

10

/ 10

Row

5.75.0

4.0 4.0 3.7 3.52.3

2

4

6

Nym

phs

/

0

More Applications ppby Ground

Photo: Larry Steckel

Aerial vs. Ground Application i h T f ( lf fl )with Transform (sulfoxaflor)

Angus Catchot, MSU, 2010

35Check Air Ground

TPB

25

30

Row

Ft

11.5

15.915

20

phs

/ 5 R

3.3 4.12.5

1.2 2.2

7.8

5

10

Nym

p

0

4 DAT1 5 DAT2 9 DAT2 14 DAT2

Insecticide Resistance ManagementInsecticide Resistance Management

Using different classes of chemistry in a g ylogical sequence (and manner) to prevent or delay resistancey◦ For example, I typically do not recommend the use of

neonicotinoid insecticides after bloom◦ Sometimes easier said than done

An Encouraged Use Pattern for TPB in Tennessee …

Neonic’s OPs / Carbamates / etc. Tanks Mixes

Centric, Acephate, Bidrin Pyrethroids +Imidacloprid Vydate Diamond + OPs Vydate

g

Imidacloprid, Vydate, Diamond + OPs, Vydate, Carbine Diamond

Prebloom Early Bloom Late Bloom

Cultural Controls, etc…• Farmscaping

o Site specific scouting and targeted insecticide applicationsp g g pp

• Nectariless cotton

Minimize Corn/CottonBorders

Scout more often!Treat more often?

Photo: Chism Craig

Summary It will take multiple control tactics to

manage TPB in high pressure areasg g p◦ Insecticides will still be at the core of this program We must use them efficiently The presence of other pests and resistance levels will

dictate insecticide selection New insecticides especially new classes and other new New insecticides, especially new classes, and other new

technologies are critically needed

◦ Cultural controls can help bridge the gap