Crop Consultant Intelligence: Eyewash Rule Deadline, El Niño Prep and Lettuce Mildew Strains

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Research through October 30, 2026, 10:00 a.m. PT. This week brings one hard deadline and one big forecast. DPR takes comments on its eyewash and decontamination rewrite through Thursday, while new Endangered Species Act limits keep showing up on herbicide labels. NOAA still gives better than 83% odds that a strong-to-very-strong El Niño lasts through March. The common thread for PCAs and CCAs is getting rotations, records and fields ready before the wet season arrives.

This week in numbers

• 1 pint: Minimum eyewash fluid in the personal unit DPR would require for handlers whose labels call for eye protection¹
• 7 of 10: Imperial Valley lettuce downy mildew samples from January that were novel strains, not a named race³
• 83%: NOAA’s odds, or better, that a strong-to-very-strong El Niño lasts through Jan.–March 2027⁴

More Field Intel

The latest from our other weekly reports.

Weekly Tree Nut Report West Coast Nut · Oct 28
Sacramento Valley almond rejects by variety, johnsongrass timing, walnut blight bud sampling and 2025 walnut prices. Read it

AgTech Intelligence Enterprise Ag · Oct 29
Paid on-farm technology trials, autonomous Kubota orchard tractors due in 2027 and what FIRA USA showed. Read it

For PCAs: Pesticide and Pest Management

1. DPR’s eyewash and decontamination rewrite: comments close November 5

Recent update · DPR, Oct 20, 2026; statewide

DPR has proposed changes to seven sections of the state’s pesticide worker safety regulations. Employees who mix and load pesticides with a high potential for eye injury would need access to an eyewash station that meets the ANSI Z358.1-2014 standard, and every employee who handles a product whose label requires protective eyewear would need a personal eyewash unit holding at least one pint of eyewash fluid.¹

For handlers working outside commercial or research production of agricultural commodities, employers would have to provide a decontamination site within 100 feet of the mixing/loading or fumigation site, regardless of signal word. The proposal also clarifies a PPE exemption for handling liquid fumigants. DPR extended the comment period from November 2 to November 5, when it will take oral and written comments at a virtual hearing at 1:30 p.m., with Spanish interpretation.¹

Next step: This week, walk grower and applicator clients through the proposed text: list each crew and mixing site, what eyewash and decontamination supplies are there now, and which labels in the program require protective eyewear. If a requirement would be hard to meet in the field, comment by November 5. Nothing changes until DPR adopts a final rule; current regulations and labels still govern.

Sources: DPR hearing notice · DPR 26-005 proposal and documents

2. ESA limits keep spreading across herbicide labels; two EPA tools help check them

New this week · UC Weed Science and GROW, Oct 27–29, 2026; statewide

As herbicides move through EPA review this year, their labels are coming out with new spray-drift, runoff and erosion requirements tied to the agency’s Endangered Species Act obligations, according to an October 27 roundup from the GROW integrated weed management group. Brad Hanson passed it along to California readers on the UC Weed Science blog on October 29.²

The first check is EPA’s Bulletins Live! Two, which shows whether a field falls inside a Pesticide Use Limitation Area (PULA) that carries added restrictions. EPA’s Pesticide App for Label Mitigations (PALM) combines its spray-drift and runoff calculators in one mobile-friendly tool. EPA says the calculators are informational, users remain responsible for meeting every label requirement, and not all labels allow runoff/erosion or drift-reduction measures.²

Next step: Before winter and spring herbicide recommendations go out, check each product’s current label for ESA language, look up the field in Bulletins Live! Two for the planned application period, and run PALM only where the label allows mitigation credits. File a copy of the result with the recommendation and the application record.

Sources: UC Weed Science post · GROW roundup · Bulletins Live! Two · EPA PALM

3. Imperial Valley lettuce: most downy mildew samples were new strains

Research to apply · UCCE Imperial and UC Davis, Oct 16, 2026; Imperial Valley lettuce

UCCE and UC Davis researchers characterized 10 lettuce downy mildew samples collected in the Imperial Valley in January 2026: seven from a 60-line trap nursery at the UC Desert Research and Extension Center in Holtville and three from fields near Holtville. Only three were a known race (9US). The other seven were novel strains that match no officially named race, which is why a resistant variety can still show heavy disease.³

In lab seedling tests on seven isolates, oxathiapiprolin (FRAC 49) controlled all seven. Mefenoxam (FRAC 4) was effective on two, partly effective on three and not effective on two; mandipropamid (FRAC 40) was effective on three and partly effective on four. This is one season’s sample from one valley, not a field trial. The authors note that a strong El Niño may bring more downy mildew than usual this winter.³

Next step: Before the main winter plantings, review each ranch’s variety list and fungicide rotation with the grower: which resistance genes are planted where, and whether any block leans on one FRAC group. The authors suggest broad 7US–10US resistance, mixed varieties, rotation within label limits and protection before cool, foggy weather. Send samples from resistant varieties that show disease to UCCE Imperial.

Source: SoCal Desert Plant Pathology: winter 2026 isolates

Pesticide-use note: Current California labels, permit conditions and county requirements govern pesticide use. Verify them before making or changing a recommendation.

For CCAs: Agronomy

4. A record-setting El Niño is building: ready fields and records before the storms

New this week · UC ANR, Oct 27, 2026, with NOAA, DWR and FSA; statewide

NOAA’s Climate Prediction Center gives better than an 83% chance that a strong-to-very-strong El Niño lasts through January–March 2027, and its October 15 outlook favors above-normal November–January precipitation for much of California, though with lower probabilities on the West Coast than in the Southeast.⁴ UC ANR climate scientist Daniel Swain expects the strongest tilt toward a wet winter in central and southern California, with peak impacts by November or December and possibly lingering through March, though no outcome is guaranteed.⁵

DWR has pre-positioned 4.4 million sandbags and 400,000 tons of rock at 68 locations, and the Governor has proclaimed a state of emergency ahead of winter. A UC ANR roundup for farms, posted October 27, points to the state’s updated MyHazards lookup and USDA disaster programs.⁵ FSA has dropped the 15% mortality threshold from its Tree Assistance Program starting with program year 2026, raised the reimbursement rate for pruning, removal and salvage costs from 50% to 65%, and requires applications within 90 calendar days of the disaster event or of when the loss becomes apparent.⁶

Next step: In the next two weeks, walk each operation’s drainage: culverts, ditches, tailwater systems and low corners. Finish ground work and cover-crop seeding where you can, and keep fertilizer and other application plans clear of forecast storms. Take dated photos of orchards and fields now, so any storm losses can be documented within FSA’s 90-day window or for insurance.

Sources: NOAA ENSO discussion · DWR · UC ANR flood resources · FSA TAP

5. Coastal citrus and avocado: lessons from past wet winters

Seasonal reminder · UC ANR Topics in Subtropics, Oct 22, 2026; coastal Southern California

Writing for UC ANR’s Topics in Subtropics blog, Ben Faber recalls citrus and avocado trees collapsing from root asphyxiation after the very wet 1997–98 winter and, less severely, in 2005. Waterlogged soil shuts out air and lets ethylene build up, leading to leaf and fruit drop, iron chlorosis on higher-pH soils and even canopy collapse. In avocados especially, young trees with poorly developed roots and orchards on flat ground have been hit hardest.⁷

For trees already in the ground, he suggests pulling mulch back so soil dries faster, whitewashing branches after heavy leaf drop and adjusting irrigation, since trees without leaves are not transpiring. In coastal lemons, edema (cell burst) follows warm, wet soil and cool, moist air; avoiding extra irrigation and reducing nitrogen appear to help. He also saw more avocado anthracnose, and citrus brown rot, Septoria, Alternaria and gummosis where copper programs lapsed.⁷

Next step: Before the first big storm, flag young, flat and poorly drained blocks, and review mulch depth, irrigation set lengths and late-season nitrogen plans for them. Coordinate with the PCA so copper and snail programs are timed before persistent rain, not after it.

Source: Topics in Subtropics: Learning from Past Rains

6. California cotton harvest reaches 50%, and wheat planting runs ahead of average

New this week · USDA NASS Crop Progress, Oct 26, 2026; statewide

For the week ending October 25, USDA NASS put California’s cotton harvest at 50% complete, up from 40% a week earlier and ahead of the 2021–2025 average of 42%. Winter wheat was 30% planted and 15% emerged, against averages of 25% and 9%.⁸

The state had 6.5 days suitable for fieldwork that week, and topsoil moisture was rated 85% adequate, 5% short and 10% very short, with no surplus. These are statewide pace estimates, not field conditions; the next report is due November 2.⁸

Next step: Use the remaining workable days to close out harvest, residue and input records by field. For newly planted wheat, check emergence and stand locally before changing fertility or weed plans, and note fields where wet-season access could limit later passes.

Source: USDA NASS Crop Progress, Oct 26

Coming week watchlist

Nov 2 Statewide field crops: USDA NASS’s next weekly Crop Progress report, with California cotton and winter wheat.⁸

Nov 4 Sutter and Yuba counties: roadside and right-of-way weed meeting in Yuba City, 9 a.m.–1 p.m.; free, with 4.45 hours of DPR and CCA credit.⁹

Nov 5 Statewide: DPR’s virtual hearing (1:30 p.m.) and comment deadline on the eyewash and decontamination proposal.¹

What are you seeing?

Email info@jcsmarketinginc.com and tell us your crop, county and biggest field question.

We may take it up in a future edition.

Editorial note: Source findings and regulatory descriptions are summarized above. The “Next step” passages are MyAgLife editorial suggestions for field review, not source-issued prescriptions. This report does not award CE credit.

Sources

1. California Department of Pesticide Regulation, “Save the Date: Hearing on Proposed Eyewash and Decontamination Regulations,” October 20, 2026; and “DPR 26-005: Pesticide Decontamination Sites,” proposed regulation noticed September 18, 2026.
2. Brad Hanson, UC Weed Science blog, “Resources for understanding changing pesticide labels (ESA language),” October 29, 2026; Emily Unglesbee, GROW, “Herbicide Labels Are Changing. Here’s How to Keep Up!” October 27, 2026; U.S. EPA, “Pesticide App for Label Mitigations (PALM)” and “Bulletins Live! Two,” accessed October 30, 2026.
3. Ana M. Pastrana (UCCE Imperial, Riverside and San Diego counties), Charlotte Acharya and Richard Michelmore (UC Davis Genome Center), SoCal Desert Plant Pathology blog, “Lettuce Downy Mildew in the Imperial Valley: What Our Winter 2026 Isolates Are Telling Us,” October 16, 2026.
4. NOAA Climate Prediction Center, “ENSO Diagnostic Discussion,” October 8, 2026; and “Prognostic Discussion for Long-Lead Seasonal Outlooks,” October 15, 2026.
5. California Department of Water Resources, “As Flood Preparedness Week Begins, DWR Calls on All Californians to Prepare for an El Niño-Driven Winter,” October 19, 2026; Daniel Swain, UC ANR, “El Niño 2026–2027: A Potentially Historic Global Climate Event,” August 2026; and Lilian Thaoxaochay, UC ANR Disaster Blog, “2026–27 Flood Preparedness Resources for Communities, Businesses, and Farmers,” October 27, 2026.
6. USDA Farm Service Agency, “Tree Assistance Program (TAP),” accessed October 30, 2026.
7. Ben Faber, UC ANR Topics in Subtropics, “Learning from Past Rains,” October 22, 2026.
8. USDA National Agricultural Statistics Service, “Crop Progress,” released October 26, 2026; California cotton, winter wheat, days-suitable and topsoil-moisture tables for the week ending October 25, and the release schedule.
9. Whitney Brim-Deforest, UC ANR Green Blog, “Land managers invited to up their game against roadside weeds at Yuba City training on Nov. 4,” October 28, 2026.