Post on 08-Jul-2020
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