Low residue sprout inhibition in potatoes

Kürt Demeulemeester, Kurt Cornelissen, Marie Demarcke

Research Project RESKIA(2015-2017)

Trial set-up

• 6 stores• 4 boxes (750 kg/box) per store • Ambient air ventilation + mechanical cooling• Sprout control:

• electrofog• restrain generator

• 7 varieties per box

Tested sprout suppressants

Name Active ingredient

1 Gro-Stop Electro chloorpropham (636 g/l )

2 Biox-M spearmint oil 100 %

3 Restrain ethylene 96%

4 Bio-024 orange oil

5 1,4 Sight 1,4-dimethylnaphthalene (987,6 g/l)

6 SmartBlock 3-decen-2-one (784 g/l)

6,5 ° C

Applications: dose & timing2016-2017

16 N

ov

23 N

ov

14 D

ec

21 D

ec

4 Ja

n

11 J

an

17 J

an

25 J

an

8 Fe

b

15 F

eb

8 M

ar

20 M

ar

21 M

ar

29 M

ar

19 A

pr

3 M

ay

10 M

ay

18 M

ay

30 M

ay

Tota

l

1 Bio-024 100 100 100 100 100 100 100 100 100 100 1000

2 SmartBlock 100 100 100 300

3 1,4Sight 20 20 20 20 20 100

4 Restrain 10 10

5 Biox-M 90 30 30 30 30 30 30 30 300

6 Gro-Stop Electro 18,8 12,6 12,6 12,6 56,6

Number of applications

Total dose(product per ton potatoes)

1 Bio-024 10 1000 ml2 SmartBlock 3 300 ml3 1,4Sight 5 100 ml4 Restrain continuous 10 ppm5 Biox-M 8 300 ml6 Gro-Stop Electro 4 56,6 ml

Varieties

Industry Fresh market Double

Fontane Markies Innovator(MH)

Charlotte Nicola Bintje

MH = maleic-hydrazide

8

Assessments

Effectiveness

• Sprouting• 1 February

• 15 March

• 1 May

• 15 June

• Shelf-life (fresh-market varieties)

• Washing

• Store 2 weeks @ 15°C

• Sprouting +7d and +14d

Other parameters

• Fry colour

• Internal sprouting

• Silver scurf

• Black dot

• Cooking quality

• Weight loss

1. No sprouts2. White point3. Biggest sprout < 2 mm4. Biggest sprout 2 – 5 mm5. Biggest sprout 5 – 10 mm6. Biggest sprout > 10 mm

Sprouting index (1-6 )

Sprouting – scale

Only biggest sprout assessed(white and brown apart)

Sprouting index at unloading

2.21.9

2.22.4 2.3

1.82.2

2.9 2.8 2.83.0 2.9

2.63.0

3.3 3.2 3.3 3.22.9

2.4

3.23.5 3.4

3.8

3.43.0

2.5

3.4

Bint

je

Font

ane

Inno

vato

r

Inno

vato

r_m

h

Mar

kies

Cha

rlotte

Nic

ola

Bint

je

Font

ane

Inno

vato

r

Inno

vato

r_m

h

Mar

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Cha

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Nic

ola

Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

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Font

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Inno

vato

r

Inno

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r_m

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Mar

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Nic

ola

T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

(All)

February 1st March 15th May 1st June 15th

Sprouting index at unloading

2.5

1.92.2

2.7 2.8

2.22.6

3.12.7

3.03.3 3.2

2.93.1 3.1

2.63.0

3.22.9

2.72.9

3.43.1

3.43.3 3.2

2.93.1

Bint

je

Font

ane

Inno

vato

r

Inno

vato

r_m

h

Mar

kies

Cha

rlotte

Nic

ola

Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

Gro-Stop

February 1st March 15th May 1st June 15th

Sprouting index at unloading

2.52.2 2.3 2.4

3.0

1.9

2.7

3.93.7 3.7 3.6

4.0

3.4

4.0

4.84.6

4.24.0

4.54.2

4.9

4.4 4.4 4.3

3.8

4.24.0

4.6

Bint

je

Font

ane

Inno

vato

r

Inno

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r_m

h

Mar

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Cha

rlotte

Nic

ola

Bint

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Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

je

Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

Bio-024

February 1st March 15th May 1st June 15th

Sprouting index at unloading

2.42.1 2.2

2.52.2

1.8 2.0

3.63.4

3.03.2 3.2

2.93.3

4.03.7 3.6

3.43.6

2.5

3.4

4.23.8

4.1

3.63.8

2.3

3.9

Bint

je

Font

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Inno

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Inno

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Mar

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Nic

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Bint

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Font

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Inno

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r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

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Font

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Inno

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r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

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Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

Biox-M

February 1st March 15th May 1st June 15th

Sprouting index at unloading

2.7

2.0

2.62.8 2.8

1.9

2.8

3.53.2

3.43.7

3.1

2.8

3.7

4.3 4.4 4.64.3

2.8 2.8

4.5 4.34.7

5.3

4.4

3.2

2.6

4.4

Bint

je

Font

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Inno

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Inno

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Mar

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Cha

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Nic

ola

Bint

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Font

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Inno

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r

Inno

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r_m

h

Mar

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Cha

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Nic

ola

Bint

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Font

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Inno

vato

r

Inno

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r_m

h

Mar

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Cha

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Nic

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Bint

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Font

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Inno

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Inno

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Mar

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Nic

ola

T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

Restrain

February 1st March 15th May 1st June 15th

Sprouting index at unloading

1.61.4

1.82.0

1.11.4 1.5

1.1 1.1 1.2 1.1 1.0 1.0 1.1 1.11.4

1.71.3

1.1 1.1 1.2

1.7 1.6

3.1

2.1

1.1

1.72.0

Bint

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Inno

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Bint

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Inno

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Inno

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Bint

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Inno

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Inno

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Bint

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Inno

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T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

Smartblock

February 1st March 15th May 1st June 15th

Sprouting index at unloading

1.7 1.62.0

2.32.0

1.71.9

2.4 2.5 2.62.9 2.8

2.42.8

2.4 2.5 2.7 2.8

2.3

1.5

2.42.7 2.8 2.8

3.12.8

1.4

2.6

Bint

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Inno

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T1 T2 T3 T4

Sprouts < 2mm (%) Sprouts 2-5mm (%) Sprouts > 5mm (%) Sprouting index (1-6)

1,4 Sight

February 1st March 15th May 1st June 15th

Comparison June 2017 (after 8 months storage)

4.4 4.4

4.0

3.4

4.2 4.2

4.6

1.0 1.1

1.51.3

1.1 1.1 1.1

2.8 2.92.7

3.0

2.5

2.12.4

4.5 4.6

5.1

4.0

2.83.0

5.0

3.6 3.63.3

3.5 3.4

2.9

3.6

3.0 3.0 3.1 3.23.4

2.93.0

Bint

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BIO 024 Smartblock 1,4 Sight Ethyleen Biox M Gro Stop Electro

Sprouts < 2 mm Sprouts 2-5mm Sprouts > 5mm Sprouting index (1-6)

Restrain

Fry colour (0-6)

Varieties

2.0 3.0 4.0

Bintje

Fontane

Markies

Innovator

Innovator_mh

19/jun 8/mei 15/jan 1/feb

Products

2.0 3.0 4.0

Bio 024

SmartBlock

1,4 Sight

Restrain

Biox M

Gro Stop

19/jun 8/mei 15/mrt 1/feb

Internal sprouting (% tubers)

Varieties

0 2 4

Bintje

Fontane

Markies

Innovator

Innovator_mh

Charlotte

Nicola

19/jun 8/mei 15/mrt

Products

0 2 4

Bio 024

SmartBlock

1,4 Sight

Restrain

Biox M

Gro Stop

19/jun 8/mei 15/mrt

Skin diseases

Silver scurf Black dot

Trial @ Thorembais(Pomuni)

1,4 Sight vs. CIPC

2016-2017

Trial outline

Location• Wooden boxes• 2 cels 900 tonnes• Multiple varieties

• Challenger

• Noblesse

• Fogging

Assessments• Sprouting before washing• Shelflife at 10°C and 18°C• Sprouting after 7, 14, 21 and 28 days

Date Box A Box B

14 Nov Growstop Fog300g/l

22 Nov 1,4 Sight

10 Jan 1,4 Sight

16 Jan Growstop Fog300g/l

ResidueCIPC

Challenger Noblesse

4 Jan 0,13 3,2025 Jan 0,65 5,90

Fogging regime & residues

Dose: 20 ml/ton

ResidueDMN

Washed Peeled Challenger

25 Jan no no -

28 Jan (+ 3d) yes no 0,76

1 Feb (+ 7d) yes no 0,51

23 Feb (+ 28d) yes no 0,23

23 Feb (+ 28d) yes yes 0,04

Challenger - sprouting

1.0

2.0

3.0

4.0

5.0

6.0

5 jan 11 jan 19 jan 26 jan 2 feb 26 jan 2 feb 9 feb 16 feb 23 feb

T1 T2

SPR

OU

TIN

G IN

DEX

(1-6

)

Challenger - CIPC - 18°C Challenger - 1,4 Sight - 18°CChallenger - CIPC - 10°C Challenger - 1,4 Sight - 10°C

Fogging Mid January

Noblesse- sprouting

1.0

2.0

3.0

4.0

5.0

6.0

5 jan 11 jan 19 jan 26 jan 2 feb 26 jan 2 feb 9 feb 16 feb 23 feb

T1 T2

SPR

OU

TIN

G IN

DEX

(1-6

)

Noblesse - CIPC - 18°C Noblesse - 1,4 Sight - 18°CNoblesse - CIPC - 10°C Noblesse - 1,4 Sight - 10°C

Fogging Mid January

Conclusions

CIPC can be replaced for long term storage

Shelf-Life• Alternatives work enough up to 7 days @ 15 °C without MH• Effect of interval between treatment and unloading

Quality not influenced by product except...• Internal germination (suppressant vs. inhibitor)• Fry colour (depending on variety x product)

Acknowledgments

Partners

Funding