Efficacy of Dominus fumigant and performance of four UC cultivars in

Verticillium-infested soils.

Ryan Brantley Research Associate

Cal Poly Strawberry Center

Verticillium dahliae • Verticillium wilt¹

• Stunted plant, interveinal browning, collapse

• Black streaks or blotches inner leaves distinguish from Phytophthora

• Not host specific

• Infects weeds and crops

• Especially destructive Semi-arid

• Management: Pre-plant fumigation

• Cultural controls: soil solarization, crop rotation with broccoli, cereal, ryegrass, tolerant cultivars

¹http://www.ipm.ucdavis.edu

Non-fumigated

(UTC)

Pic-Clor 60 42 gal/Ac

Dominus 40 gal/Ac

Tri-Con 50/50 350 lb/Ac

•Allyl isothiocyanate (AITC) 96.3%-oil of mustard

•Broad spectrum

•Biofumigant

Data Collected

• Weeds

• Yield

• Plant mortality

UTC Dominus Pic-Clor 60 Tri-Con 50/50

Malva Malva Malva Malva

Sow thistle Sow thistle Sow thistle Sow thistle

Chenopodium Chenopodium Chenopodium

Shepard’s purse Shepard’s purse Nightshade

Purslane Purslane

Stinging nettle Stinging nettle

Petty spurge Petty spurge

Unidentified grasses Unidentified grasses

Nightshade

Weed Species Present

8.2

2.9

3.8

3.5

7.2

0.9

3.2

3.7

0 1 2 3 4 5 6 7 8 9

UTC

Dominus

Pic-Clor 60

Tri-Con 50/50

Mean number weeds and % coverage per 4 ft²

Average Number of Weeds/Percent Coverage

(December 2014 thru March 2015)

% Coverage

Average

0

50

100

150

200

250

300

350

400

450

Dominus Pic-Clor 60 Tri-Con 50/50 UTC

Wee

d f

resh

wei

gh

t (l

b)

Weed Fresh Weight (February-May, 2015)

-55%

-92% -91%

46,915

40,348

53,429

35,524

0

10,000

20,000

30,000

40,000

50,000

60,000

Dominus Pic-Clor 60 Tri-Con 50/50 UTC

Yie

ld (

lb m

ark

eta

ble

fru

it/a

cre)

Quadrant Yields

(February 11-August 26, 2015)

+50.4%

+13.5%

+32.1%

0

500

1000

1500

2000

2500

3000

3500

19-Jun 12-Jul 12-Aug 10-Sep

No

. d

ead

pla

nts

per

qu

ad

ran

t Plant Mortality

UTC

Pic-Clor 60

Dominus

Tri-Con 50/50

[VALUE] (34%)

[VALUE] (47%)

[VALUE] (15%)

[VALUE] (54%)

0 2,000 4,000 6,000 8,000 10,000 12,000 14,000

Dominus

Pic-Clor 60

Tri-Con 50/50

UTC

No. of dead plants/acre

Final Plant Mortality (Sep-2015)

% mortality

Non-fumigated Tri-Con 50/50 350 lb/Ac

Pic-Clor 60 42 gal/Ac

Dominus 40 gal/Ac

Replicated

Variety Trial

Albion

San Andreas

Monterey

Portola

0

100

200

300

400

500

600

700

800

900

Dominus Pic-Clor 60 Tri-Con 50/50 UTC

Mark

etab

le f

ruit

(lb

)

per

248 p

lan

ts

Variety Trials Marketable Yield

Feb. 11 – Aug. 26, 2015 Albion

Monterey

Portola

San Andreas

Dominus

Cultivar Yield Culls

San Andreas 4.7ᶻ aʸ 0.37ˣ aʸ

Portola 4.6 a 0.50 a

Monterey 4.1 ab 0.46 a

Albion 3.6 b 0.28 a

ᶻAverage marketable yield (lb) per harvest/62 plants for 2014-15 season (February 11-August 26,

2015 ).

ʸMeans that do not share a letter are significantly different.

Tukey 95% Simultaneous Confidence Intervals

ˣAverage cull weight (lb) per harvest/62 plants for 2014-15 season (February 11-August 26, 2015 ).

Pic-Clor 60

Cultivar Yield Culls

San Andreas 4.2ᶻ aʸ 0.43ˣ aʸ

Monterey 3.4 b 0.30 a

Portola 3.1 b 0.28 a

Albion 3.1 b 0.33 a

ᶻAverage marketable yield (lb) per harvest/62 plants for 2014-15 season (February 11-August 26, 2015 ).

ʸMeans that do not share a letter are significantly different.

Tukey 95% Simultaneous Confidence Intervals

ˣAverage cull weight (lb) per harvest/62 plants for 2014-15 season (February 11-August 26, 2015 ).

Tri-Con 50/50

Cultivar Yield Culls

San Andreas 4.8ᶻ aʸ 0.39ˣ aʸ

Portola 4.3 ab 0.50 a

Monterey 3.9 ab 0.41 a

Albion 3.4 b 0.31 a

ᶻAverage marketable yield (lb) per harvest/62 plants for 2014-15 season (February 11-August 26,

2015 ).

ʸMeans that do not share a letter are significantly different.

Tukey 95% Simultaneous Confidence Intervals

ˣAverage cull weight (lb) per harvest/62 plants for 2014-15 season (February 11-August 26, 2015 ).

Unfumigated (UTC)

Cultivar Yield Culls

San Andreas 3.7ᶻ aʸ 0.36ˣ aʸ

Albion 2.9 b 0.31 a

Monterey 2.8 b 0.22 a

Portola 2.3 b 0.19 a

ᶻAverage marketable yield (lb) per harvest/62 plants for 2014-15 season (February 11-August 26,

2015 ).

ʸMeans that do not share a letter are significantly different.

Tukey 95% Simultaneous Confidence Intervals

ˣAverage cull weight (lb) per harvest/62 plants for 2014-15 season (February 11-August 26, 2015 ).

9/11

/201

5

8/30

/201

5

8/23

/201

5

8/13

/201

5

8/4/

2015

7/28

/201

5

7/15

/201

5

7/8/

2015

7/1/

2015

6/25

/201

5

6/22

/201

5

6/17

/201

5

6/12

/201

5

6/9/

2015

6/4/

2015

5/14

/201

5

60

50

40

30

20

10

0

No

. d

ead

pla

nts

per

plo

t/6

2 Albion

Monterey

Portola

San Andreas

cv

Variety Mortality (UTC)

670

201

471

140

0

100

200

300

400

500

600

700

800

UTC Dominus Pic-Clor 60 Tri-Con 50/50

No

. d

ead

p

lan

ts p

er t

ria

l/9

92

Mortality Variety Trial

(Sep 2015)

68%

20%

48%

14%

128

342

153

443

0

50

100

150

200

250

300

350

400

450

500

Albion Monterey San Andreas Portola

# o

f d

ead

pla

nts

per

cu

ltiv

ar/

992 p

lan

ts

Cultivar Mortality

45%

15%

35%

13%

Cultivar Verticillium-Resistance score

¹www.http://research.ucdavis.edu

ᶻresistance score 1-5, 5=best

Acknowledgements

L & G Farming