Efficacy of Dominus fumigant and performance of four UC cultivars in

Verticillium-infested soils

Ryan BrantleyGerald Holmes Kelly Ivors

Student assistance

• Mel Carter• Ryan Bitter• Eli Weissman• Cody Wong• Kevin Ansolabehere• Robert Cronk• Kenny Romero

• Lauren Rothstein• Scott Cosseboom• Christian Bejarano• Nick Heath• Jen Tarke• Hunter Morris• Franca Rossi

To increase the sustainability of the California Strawberry industry through research and education that addresses

industry needs.

USDA Ag Census 2012

Salinas-Watsonville

Santa Maria

Ventura

Salinas silty clay loam

Sep 19, 2014

DominusTri-Con 50/50

Pic-Clor 60

Nov 11, 2014

No fumigant

Pic-Clor 6042 gal/Ac

Dominus40 gal/Ac

Tri-Con 50/50350 lb/Ac

Planting Date: Nov. 11, 2014Row Spacing: 64” bedsCultivar: AlbionQuadrant ≈ 0.3 acre

March 6, 2015

Treatments• Non-fumigated• Tri-Con 50/50• Pic-Clor 60• Dominus

50% methyl bromide, 50% chloropicrin

57% chloropicrin, 37% 1,3-dicloropropene

96.3% allyl isothiocyanate (AITC)

• Weed control• Plant mortality• Yield

17 Jun 2015

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

8.2

2.9

3.8

3.5

7.2

0.9

3.2

3.7

0 2 4 6 8 10

NoFumigant

Dominus

Pic-Clor 60

Tri-Con50/50

Weed population and % coverage per 4 ft²

Weed Population and % Coverage(December 2014 thru March 2015)

% Coverage

Population

0

50

100

150

200

250

300

350

400

450

Dominus Pic-Clor 60 Tri-Con 50/50 No Fumigant

Wee

d fr

esh

wei

ght (

lb)

Weed Fresh Weight(February-May, 2015)

-55%

-92% -91%

March 6, 2015

Non-fumigatedTri-Con 50/50350 lb/Ac

Pic-Clor 6042 gal/Ac

Dominus40 gal/Ac

August 3, 2015

Normalized Density Vegetation Index: photosynthetic activity

Normalized Density Vegetation Index: photosynthetic activity

0

2000

4000

6000

8000

10000

12000

14000

19-Jun 19-Jul 19-Aug 19-Sep

No.

dea

d pl

ants

by

fum

igan

t/acr

e

No Fumigant

Pic-Clor 60

Dominus

Tri-Con 50/50

Plant Mortality

8,420 (34%)

11,637 (47%)

3,733 (15%)

13,271 (54%)

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

Dominus

Pic-Clor 60

Tri-Con 50/50

No Fumigant

No. of dead plants/acre

Final Plant Mortality (Sep2015)

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 No Fumigant

Yie

ld (l

bm

arke

tabl

e fr

uit/a

cre)

Yield by Fumigant(February 11-August 26, 2015)

+50%

+14%

+32%

+2,100 trays

Replicated Variety Trial

AlbionSan AndreasMontereyPortola

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

0Mor

talit

y pe

r pl

ot/6

2 pl

ants

No Fumigant MortalityPortola

Monterey

San Andreas

Albion

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

12

10

8

6

4

2

0Mor

talit

y pe

r pl

ot/6

2 pl

ants Albion

MontereyPortolaSan Andreas

CV

Tri-Con 50/50 Mortality

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

20

15

10

5

0Mor

talit

y pe

r pl

ot/6

2 pl

ants

San Andreas MortalityNo Fumigant

Pic-Clor 60

Dominus

Tri-Con 50/50

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

0Mor

talit

y pe

r pl

ot/6

2 pl

ants

Portola MortalityNo Fumigant

Pic-Clor 60

Dominus

Tri-Con 50/50

D - Tr

i-Con

50/

50

C - Dom

inus

B - P

ic-Cl

or 60

A - N

o Fum

igan

t

San A

ndreas

Porto

la

Mon

terey

Albion

San A

ndreas

Porto

la

Mon

terey

Albio

n

San A

ndreas

Porto

la

Mon

terey

Albio

n

San A

ndre

as

Porto

la

Mon

terey

Albio

n

200

150

100

50

0 Mar

keta

ble

Yie

ld/6

2 p

lan

ts

Variety Yields

No Fumigant Pic-Clor 60 Dominus Tri-Con 50/50

September 2, 2015

Portola Monterey

San Andreas Albion

Cultivar Verticillium-resistance score

Breeder Score

www.http://research.ucdavis.eduresistance score 1-5, 5=best

4.3

3.3

4.2

2.8

Score based on this exp’t

Conclusions• Fumigation reduced Verticillium wilt

• Tri-Con 50/50, followed closely by Dominus• Pic-Clor 60 a distant 3rd

• UC cultivars varied dramatically in response to Verticillium wilt

• Portola highest susceptibility followed by Monterey • Albion and San Andreas exhibited good resistance

1 year1 location1 disease

Acknowledgements

L & G Farming

Sage Finch, PCA

Crown Nursery