- Author: Mark Bolda
A sample of broad mites from primocane blackberry was dropped off at my office a couple of weeks ago. The mites are quite small (much smaller than twospotted spider mite), were found colonizing the younger emerging leaves of the plant and apparently giving the leaves a rumpled, curled appearance something similar to what one might see from very light Round Up damage (Photo 1 below).
As per the UC IPM guidelines, populations of broad mite tend to be most severe in warm, humid conditions such as those found in greenhouses. Which is a pretty spot on description of the weather we have had for like the last 10 weeks.
Also as per the UC IPM guidelines, the broad mites here are yellowish in color, and some (the females) have a white stripe clearly visible on the back. The eggs have distinct dimples on them (Photo 2 below).
The association with primocane blackberry is of interest. Looking back through my files, I see a communication concerning broad mites on the same in the Southeastern US, and I've been getting some calls and texts here in the area again regarding broad mites on local primocane blackberries, both public and proprietary.
- Author: Mark Bolda
Pretty short notice here, but UCCE's own Steve Fennimore is giving a seminar on the transition from methyl bromide to alternative pre-plant treatments in strawberry. It will be conveniently webcast, see the information on the flier below.
I'm tuning in for sure, I want to hear from a researcher who actually has spent a lot of time with this stuff in the trenches.
- Author: Mark Bolda
- Author: Steven Koike
- Author: Ed Show
To address the current concern of anthracnose in strawberry for the upcoming 2015-2016 season, Ed Show, Steve Koike and I put together a video featuring a discussion of the issue. It's good to talk about it because it's not a cut and dry case.
For example, out of dozens of suspect samples for anthracnose recently submitted to Steve's UCCE Diagnostic Lab in Salinas, only one has turned up positive for the causal pathogen Colletotrichum acutatum. On the other hand, this winter is supposed to be warm and wet, which could favor the disease if it is around.
The discussion taped here with Steve and I is intended to shed more light on the current situation and help people make a good decision in a timely manner.
Great videography and editing by Ed Show. Really great work.
https://www.youtube.com/watch?v=u2N7Yrm06iY
- Author: Mark Bolda
Colleague Shimat Joseph and I happened into CDPR head Brian Leahy at an ANR meeting in Sacramento this past week, and as expected we got to talking about what the hold up is with the sulfoxaflor (Sequioa) registration for control of lygus on strawberries. Readers of this blog know that this is a pretty good material for lygus, and it's been a bit frustrating to not have the registration be approved yet.
Brian helpfully clarified to us that the approval for sulfoxaflor (Sequioa) was vacated in a Federal ruling by the US Court of Appeals for the Ninth Circuit in San Francisco in September.
The ruling was in regards to a lawsuit filed in 2013 against the US EPA, which is responsible for the registration of pesticides in the US (California has an additional layer of regulation through the CDPR), by the beekeeping industry which challenged EPA approval of neonicotinoids, of which sulfoxaflor was ruled to be a subclass.
This last point is arguable, since while sulfoxaflor targets the same receptors in the insect as a neonicotinoid, it belongs to a different class of chemistry, the sulfoxamines.
With regards to future registration of this product, the court said that the EPA "must obtain further data regarding the effects of sulfoxaflor on bees... before it grants approval."
The EPA has yet to formulate a response to this decision.
- Author: Mark Bolda
- Author: Steven Koike
Summary: In 2014, the authors evaluated fungicide products against a slate of several registered fungicides and an untreated control. Fungicides were tested for efficacy against gray mold caused by Botrytis cinerea and powdery mildew caused by Podosphaera aphanis.
Introduction: The authors have been engaged in studying fruit and foliar pathogens in strawberry since 2007. While this group of pathogens includes anthracnose caused by species of Colletotrichum, leather rot caused by Phytophthora cactorum and angular leaf spot caused by Xanthomonas fragariae, the fungicide screening of 2014 concentrated on the two most common problems: gray mold caused by Botrytis cinerea, and powdery mildew caused by Podosphaera aphanis. Year after year these diseases are the most important foliar/fruit concerns for growers, and subsequently garner the most attention from fungicide distributors and manufacturers.
Materials and Methods:
Powdery Mildew: The trial consisted of treatments (Table 1) arranged in a randomized complete block design with each treatment replicated four times, on the Holly Ranch managed by Dole on the variety Monterey. Applications of all materials were made in the equivalent of 150 gallons per acre with a motorized backpack sprayer and hand held boom configured with ten 8001 flat fan nozzles operating at 120 psi, which is intended to closely mimic the conditions of commercial application. Applications of all materials were made two weeks apart: May 16, May 28, June 16, and June 24, 2014.
Powdery mildew evaluations were done on June 5, June 19 and July 7 and consisted of taking ten strawberry leaflets (per plot) of young to mid-age and assigning a percentage on a scale of 0-100% (in 10% increments) to the level of powdery mildew severity on the underside.
Table 1: 2014 Powdery Mildew Treatments
|
Test Material |
Rate/acre |
Thiram 24/7 |
2.6 qt |
|
Thiram 24/7 2.6 qt+ Procure 480 SC |
8 fl oz |
|
Thiram Granu-Flo |
4.4 lb |
|
Pyriofenone |
4 fl oz |
|
Pyriofenone |
5 fl oz |
|
Pyriofenone 4 fl oz + Quintec |
6 fl oz |
|
Quintec |
6 fl oz |
|
Rally |
5 oz |
|
Rally 5 oz w/ Quintec |
5 fl oz |
|
Merivon + Nufilm P |
8 fl oz + 0.01% v/v |
|
Merivon + Nufilm P |
10 fl oz + 0.01% v/v |
|
Pristine |
23 oz |
|
Torino 3.4 fl oz w/ Mettle |
5 fl oz |
|
Isofetamid |
17 fl oz |
|
Isofetamid + IB8111 |
10.3 fl oz + 5.57 fl oz |
|
Isofetamid + 18121 |
10.3 fl oz + 16.5 fl oz |
|
Isofetamid + IB18220 |
10.3 fl oz + 7.6 fl oz |
|
Untreated check |
- |
Results for 2014 Trial
Table 2: 2014 Powdery Mildew Evaluation- Percent Leaf Disease by Treatment
Character Rated |
% Infest |
% Infest |
% Infest |
||||
Rating Date |
Jun-5-2014 |
Jun-19-2014 |
Jul-7-2014 |
||||
Number of Decimals |
2 |
2 |
2 |
||||
Trt |
Treatment |
|
|
|
|
|
|
Name |
1 |
2 |
3 |
||||
1 |
Thiram 24/7 2.6 qt |
23.44 |
a |
17.25 |
bcd |
23.08 |
abc |
2 |
Thiram 24/7 2.6 qt+ Procure 480 SC 8 fl oz |
11.88 |
cde |
7.25 |
gh |
14.64 |
def |
3 |
Thiram Granu-Flo 4.4 lb |
16.25 |
bc |
18.00 |
bc |
26.35 |
a |
4 |
Pyriofenone 4 fl oz |
13.44 |
cde |
13.00 |
def |
15.85 |
cde |
5 |
Pyriofenone 5 fl oz |
13.13 |
cde |
8.25 |
fgh |
8.90 |
fgh |
6 |
Pyriofenone 4 fl oz + Quintec 6 fl oz |
15.31 |
bcd |
11.25 |
efg |
13.60 |
d-g |
7 |
Quintec 6 fl oz |
15.00 |
bcd |
15.50 |
b-e |
23.55 |
ab |
8 |
Rally 5 oz |
16.25 |
bc |
19.25 |
b |
29.40 |
a |
9 |
Rally 5 oz w/ Quintec 5 fl oz |
10.31 |
c-f |
14.00 |
cde |
17.26 |
bcd |
10 |
Merivon 8 fl oz + Nufilm P 0.01% |
6.88 |
ef |
4.25 |
h |
6.76 |
hi |
11 |
Merivon 10 fl oz + Nufilm P 0.01% |
3.75 |
f |
3.75 |
h |
3.49 |
i |
12 |
Pristine 23 oz |
21.25 |
ab |
13.00 |
def |
22.66 |
abc |
13 |
Torino 3.4 fl oz w/ Mettle 5 fl oz |
7.19 |
ef |
7.00 |
gh |
8.67 |
gh |
14 |
Isofetamid 17 fl oz |
11.88 |
cde |
8.75 |
gh |
11.47 |
d-h |
15 |
Isofetamid 10.3 fl oz + IB8111 5.57 fl oz |
10.63 |
cde |
11.75 |
efg |
15.71 |
cde |
16 |
Isofetamid 10.3 fl oz + 18121 16.5 fl oz |
11.94 |
cde |
4.75 |
h |
10.84 |
e-h |
17 |
Isofetamid 10.3 fl oz + IB18220 7.6 fl oz |
9.06 |
def |
7.25 |
gh |
10.98 |
d-h |
18 |
Untreated check |
20.94 |
ab |
24.75 |
a |
30.04 |
a |
LSD (P=0.05) |
6.768 |
4.920 |
0.838t |
||||
Standard Deviation |
4.786 |
3.479 |
0.593t |
||||
CV |
36.12 |
29.53 |
14.89 |
Means followed by same letter do not significantly differ (P=0.05, LSD)
Botrytis Gray Mold: The trial consisted of treatments (Table 3) arranged in a randomized complete block design with each treatment replicated four times, on the Holly Ranch managed by Dole on the variety Monterey. Applications of all materials were made in the equivalent of 150 gallons per acre with a motorized backpack sprayer and hand held boom configured with ten 8001 flat fan nozzles operating at 120 psi, which is intended to closely mimic the conditions of commercial application. Applications of all materials were made two weeks apart May 16, May 28, June 16, and June 24, 2014.
Evaluations for Botrytis infected fruit were made during the weekly fruit harvest by a professional crew of research plot harvesters beginning May 21 and continuing until July 16. Culls were sorted and examined for symptoms and signs of gray mold disease, and a percentage of gray mold infected fruit was calculated from the total fruit harvested from that plot. Data results (Table 4) is presented as a percentage of Botrytis infected fruit from the total amount harvested.
Table 3: Test materials for Botrytis study
|
Test Material |
Rate/acre |
Thiram 24/7 |
2.6 qt |
|
Thiram 24/7 2.6 qt+ Procure 480 SC |
8 fl oz |
|
Thiram Granu-Flo |
4.4 lb |
|
Merivon + Nufilm P |
8 fl oz + 0.01% v/v |
|
Merivon + Nufilm P |
10 fl oz + 0.01% v/v |
|
Pristine |
23 oz |
|
Isofetamid |
17 fl oz |
|
Isofetamid + IB8111 |
10.3 fl oz + 5.57 fl oz |
|
Isofetamid + 18121 |
10.3 fl oz + 16.5 fl oz |
|
Isofetamid + IB18220 |
10.3 fl oz + 7.6 fl oz |
|
Untreated check |
- |
Table 4: Results for 2014 trial
Character Rated |
% Bot |
% Bot |
% Bot |
%Bot |
%Bot |
||||||
Rating Date |
Jun-4-2014 |
Jun-11-2014 |
Jun-18-2014 |
Jun-25-2014 |
Jul-3-2014 |
||||||
Treatment Name |
3 |
4 |
5 |
6 |
7 |
||||||
1 |
Thiram 24/7 2.6 qt |
4.21 |
a |
1.68 |
a |
3.15 |
ab |
8.75 |
a |
18.01 |
a |
2 |
Thiram Granuflo 4.4 lbs |
7.22 |
a |
1.07 |
a |
1.95 |
abc |
15.17 |
a |
18.39 |
a |
3 |
Thiram 24/7 + Procure 480 SC |
9.27 |
a |
2.49 |
a |
1.64 |
abc |
14.36 |
a |
16.198 |
a |
4 |
Merivon @ 8 fl oz |
5.52 |
a |
1.49 |
a |
0.74 |
c |
15.56 |
a |
16.268 |
a |
5 |
Merivon @ 10 fl oz |
5.96 |
a |
1.25 |
a |
0.69 |
c |
15.73 |
a |
17.233 |
a |
6 |
Pristine @ 23 oz |
7.46 |
a |
1.44 |
a |
3.49 |
a |
12.32 |
a |
14.708 |
a |
7 |
Isofetamid @ 17 fl oz |
6.54 |
a |
1.07 |
a |
1.67 |
abc |
12.70 |
a |
17.975 |
a |
8 |
Isofetamid @ 10.3 fl oz + IB8111 @ 5.57 fl oz |
5.67 |
a |
1.58 |
a |
1.35 |
bc |
10.86 |
a |
20.643 |
a |
9 |
Isofetamid @ 10.3 fl oz + IB18121 @ 16.5 fl oz |
4.69 |
a |
2.11 |
a |
2.63 |
ab |
8.60 |
a |
12.815 |
a |
10 |
Isofetamid @ 10.3 fl oz + IB18220 7.6 fl oz |
5.59 |
a |
1.85 |
a |
1.87 |
abc |
9.22 |
a |
19.803 |
a |
11 |
UTC |
13.52 |
a |
1.68 |
a |
3.14 |
ab |
7.66 |
a |
14.720 |
a |
LSD P=0.05 |
0.344t |
0.276t |
0.265t |
0.282t |
8.9782 |
||||||
Standard Deviation |
0.238t |
0.191t |
0.183t |
0.196t |
6.2180 |
||||||
CV |
27.11t |
46.46t |
39.85t |
17.79t |
36.62 |
Means followed by same letter do not significantly differ (P=0.05, LSD)
Discussion of Results for 2014 Trial:
Powdery Mildew: Control of powdery mildew by both rates of Merivon and a rotation of Torino and Mettle was exceptional, with percentages of infection significantly lower than many treatments in each of the three evaluation dates.
Looking at the last rating date on July 7, neither formulation of Thiram controlled powdery mildew, but the inclusion of Procure together with Thiram 24/7 did result in disease percentages below the untreated control. Test compounds isofetamid and pyriofenone had lower percentages of mildew than the untreated control. Rally 40W did not have significantly lower percentages of mildew than the untreated control.
Botrytis: With the exception of the June 18 evaluation date, no significant differences were found between any of treatments. On June 18, both treatments of Merivon demonstrated lower levels of Botrytis infected fruit than the untreated control, Thiram 24/7, isofetamid @10.3 fl oz + IB8111 and Pristine.
Final Note: The use of fungicides, including unregistered materials, is the topic of this article. Before using any of these products, check with your local Agricultural Commissioner's Office and consult product labels for current status of product registration, restrictions, and use information.
Acknowledgments.
We thank Patty Ayala, Kat Kammeijer and Monise Sheehan for their assistance with this trial. We acknowledge the California Strawberry Commission and cooperating companies, in particular Dole, for supporting this work.