PT-01-09 Details:

PT-01-09 Details:• Employ applied to foliage at 2.1 oz/acre in

two regimes:• 2 apps: end of set, and 3 weeks later (“X2”) • 3 apps: end of set, 3 and 6 weeks later (“X3”)

• 2009 Trial Locations: • Idaho: 5• Washington: 4

Summary: Harpin Use in PotatoesREPLICATED YIELD TRIALS WITH HARPINαβ


2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

3.5

3.6

3.7

UTC Employ X3 Employ X2

Stem

s/Pl

ant

Average of Trials 209089, 209090, 209091, 209092, 209093, 209095, 209097, 209109.

18.7

18.8

18.9

19.0

19.1

19.2

19.3

19.4

19.5

19.6

19.7

UTC Employ X3 Employ X2Pl

ant H

eigh

t

On average, the treatments had fewer stems than the untreated control.

Treated plants tended to be slightly shorter than untreated plants.

Summary Across Trials for PT-01-09 & PT-02-09



0

2

4

6

8

10

12

UTC Employ X3 Employ X2Tu

bers

/Pla

nt0

1

2

3

4

5

6

7

8

9

10

UTC Employ X3 Employ X2

Early

Vig

or (0

-10)

Treated plants had more tubers than untreated plants.

Treated plants had higher early vigor than untreated plants.




400

410

420

430

440

450

460

470

480

490

500

UTC Employ X3Employ X2

Gro

ss Y

ield

(cw

t/Acr

e)

350

360

370

380

390

400

410

420

430

440

450

UTC Employ X3 Employ X2M

arke

tabl

e Yi

eld

(cw

t/Acr

e)

Treated plants had substantially higher marketable yields than untreated plants.

Treated plants had substantially higher gross yields than untreated plants.




0%

1%

2%

3%

4%

5%

6%

7%

8%

9%

10%

UTC 351 X3 351 X2

Perc

ent I

ncre

ase

in Y

ield

Gross Yield Marketable YieldUTC Employ

X3Employ

X2Gross Crop Value $3,242 $3,578 $3,542

Cost of Treatment

$ - $63.00 $42.00

Net Crop Value $3,242 $3,546 $3,521

Net Gain $ $305 $279 ROI 9.7 13.3

The 2 application regime had a lower net gain but a higher ROI than the 3 application regime. Crop value was calculated using 2009 Idaho fresh market prices of $8.50 for US#1, $6.00 for US#2, and $2.00/cwt for usable culls; and $10.50/oz for Harpinαβ.

Percent increase ranged from 7.4% to 8.7%.




Summary for PT-01-09 & PT-02-09:• On Average:

• treatments had no statistical effect on stand, stem number, vigor and plant height

• treatments increased tuber set, ranging from 22% to 23% - may have been applied a bit early

• treatments increased gross yield, ranging from 7.4% to 7.7%

• treatments increased marketable yield, ranging from 8.1% to 8.7%



Summary for PT-01-09 & PT-02-09:• Yield increases came primarily from increased

set.• Marketable yields were improved more

than gross yields, demonstrating an increase in quality and improved crop value.

• Results were very similar to those seen with the timing trials and grower trials done with HarpinEa

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PT-01-09 Details:

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