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Soybean Aphid & Seed Treatment Updates Heading into 2005. Eileen Cullen UW Madison, Entomology Department. Seed Treatments for Soybean. Cruiser 5FS thiamethoxam nicotinoid Syngenta Yes ‘early season protection’ SBA, BLB, wireworm, maggot . Gaucho imidacloprid nicotinoid

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soybean aphid seed treatment updates heading into 2005

Soybean Aphid & Seed TreatmentUpdates Heading into 2005

Eileen Cullen

UW Madison, Entomology Department

slide2

Seed Treatments for Soybean

Cruiser 5FS

thiamethoxam

nicotinoid

Syngenta

Yes

‘early season

protection’

SBA, BLB,

wireworm, maggot

Gaucho

imidacloprid

nicotinoid

Bayer CropSci

No

Active ingredient

Chemistry

Company

EPA Reg?

Insects

slide3

Supplemental Label Registration Dec. 2004

Cruiser® 5FS Seed Treatment

Potatoes and Soybeans

For Soybeans

Active ingredient (a.i.)thiamethoxam

Rate 1.28 fl oz per 100 lbs. of seed

[50 g a.i./100Kg seed]

“to provide early season protection of seedlings against

injury by aphids, bean leaf beetle, Mexican bean beetle,

pea leaf weevil, pea weevil, plant leaf hopper, seed corn

maggot, thrips and wireworm”

slide4

Figure from recently released promotional material

for CruiserMaxx Pak (Cruiser 50g ai/100 kg seed + ApronMaxx)

250

SBA/Plant

slide5

Figure from recently released promotional material

for CruiserMaxx Pak (Cruiser 50g ai/100 kg seed + ApronMaxx)

250

SBA/Plant

Planting date?

9 June

slide7

CruiserMaxxPak promotional material

  • omitted late planting date [June 9th]
  • when presenting the UW 2003 trial.
  • Why Late Planted?
  • Spring 2003, prior to soybean aphid outbreak,
  • late planting was done to obtain insecticide
  • efficacy data. [2000-2002 trend observed that
  • late planted fields tended to be hit harder
  • by soybean aphid – good chance to obtain
  • efficacy data].
uw 2003 seed treatment trials soybean aphid

Trial 2

Trial 1

Planted: June 9

Harvest: Oct 16

Cultivar: NK S24-K4

Plots: 10’ w x 25’ l

30-inch rows

CRBD: 4 replicates

Planted: June 9

Harvest: Oct 16

Cultivar: NK S19-V2

Plots: 10’ w x 25’ l

30-inch rows

CRBD: 4 replicates

Poncho 62.5 g a.i./100 Kg seed

Poncho 125 g a.i./100 Kg seed

Gaucho 62.5 g a.i./100 Kg seed

Cruiser 62.5 g a.i./100 Kg seed

CHECK

Cruiser 30 g a.i./100 Kg seed

Cruiser 50 g a.i./100 Kg seed

Gaucho 62.5 g a.i./100 Kg seed

CHECK

UW 2003 Seed Treatment TrialsSoybean Aphid
slide9

This trial featured in

CruiserMaxx Pak brochure

62.5

Aphids/

plant

250

Aphids/Plant

May

June

Late planted

June 9th, up to 30+ days later than typical May planting dates

Sample Date

Soybean Aphid Seed Treatment Trial 1,

Arlington WI 2003. Planted Late June 9th.

Mean Aphids/Plant by sampling date

slide10

Soybean [aphid] seed treatment trial 1, Arlington WI 2003

Yield (bu/A) by Treatment. (P = 0.002; F = 6.59; df, 5)

Means followed a different letter are significantly different at  = 0.05

slide11

In a second UW 2003 seed treatment

trial, soybean aphid density exceeded

250 aphids/plant by August 13th.

-Same planting date (June 9th)

-Cruiser rate of 62.5 g a.i./100 Kg seed

-higher rate than CruiserMaxx Pak 50g

-still exceeded 250 aphids/plant

slide12

Cruiser 62.5 g exceeded

threshold, even at late planting

62.5

62.5

250

Aphids/Plant

Soybean Aphid Seed Treatment Trial 2,

Arlington WI 2003. Planted Late June 9th.

Mean Aphids/Plant by sampling date

Aphids/

plant

June

May

Sample Date

slide13

Soybean [aphid] seed treatment trial 2,Arlington WI 2003

Yield (bu/A) by Treatment. (P = 0.1151; F = 2.33; df, 4)

Means followed a different letter are significantly different at  = 0.05

slide14

Percent Mortality (%) + SEM

Days after planting

  • Lab bioassay [Univ/ of Minnesota]
  • aphids placed on leaves from
  • thiamethoxam-treated plants
  • - mortality after 24 & 48 hours

University of Minnesota, 2003, 2004 preliminary data, D. W. Ragsdale

and B. P. McCornack. Not for distribution or publication.

This slide may not be reproduced or redistributed without permission

from the authors.

Percent Mortality (%) + SEM

Days after planting

Mortality lasts for 35 days ~ V3/V4 plant stage

(Adapted from Ragsdale and McCornack 2004)

slide15

24 h

48 h

*

Untreated Control

*

*

*

Nymphs Deposited + SEM

Cruiser 50g/100Kg (thiamethoxam)

*

*

Days after planting

Lab bioassay for fecundity,U of MN

University of Minnesota, 2004 preliminary data, D. W. Ragsdale

and B. P. McCornack. Not for distribution or publication.

This slide may not be reproduced or redistributed without permission

from the authors.

thiamethoxam reduced aphid fecundity, up to ~V4

(= the number of nymphs produced)

(Adapted from Ragsdale and McCornack 2004)

slide16

From the Cruiser label:

“Early season protection”

From the Cruiser web page:

“The early-season pests, which suck and chew

on the crop during its most vulnerable and

tasty phase (the first 30 to 40 days of growth)

are intoxicated when they try to feed on

the treated crops.”

Chris DiFonzo, Michigan State University

slide17

Bottom line:

  • Seed treatments provide early-season protection
  • Seed treatments may fit well

in production areas w/ early-season

insect problems (for ex. BLB)

  • Seed treatments ALONE may not be enough

under high, or late season, SBA pressure

  • In fields lacking early-season pests, a well-

timed foliar spray, based on aphid scouting &

threshold, is the recommended practice

for optimal yield protection.

Midwest University Extension Entomologists’ Consensus Recommendation

slide18

Eileen Cullen

UW Madison Entomology Department

Extension Entomologist

University of Wisconsin

Entomology Department

1630 Linden Drive

Madison, WI 53706

Tel: (608) 261-1507

E-mail: cullen@entomology.wisc.edu