Home Tag Archives: UCCE

Tag Archives: UCCE

New Herbicides Tools for California Rice Weed Management in 2024

This year brings several new chemical tools to California rice. With many herbicide-resistant species as well as emerging problematic weed species, the new chemistries are a welcome tool for managing resistance and preventing the selection of resistant biotypes. Last year, we had use of Loyant® CA Rinskor™ active (florpyrauxifen-benzyl) for the full season (registered late in 2022). Loyant®, which is …

UCCE Tulare County Assists Pathologists in Survey for Decay Fungus in Prunes

Recently, extensive wood decay-related limb breakages have been reported in commercial prune orchards in the Sacramento Valley, adversely affecting fruit production and limiting the value of salable firewood upon orchard removal. Several fungal genera such as Phellinus, Rhodoformes, Schizophyllum, Sterum, Trametes, Ceriporia, and Perenoporia have been recognized for wood-decaying activity on California prunes.  Phellinus pomaceus has been the primary organism associated with prune decay symptoms in the Sacramento Valley; however, …

Efficacy of a Hull Split Spray vs. Sanitation for NOW Control

Navel orangeworm (NOW) is most effectively controlled with the cultural practice of winter sanitation. Winter shaking almond trees to remove mummy nuts has proven to decrease next year’s NOW damage better than any other approach. The reason for this is clear. NOW overwinters as larvae in mummy nuts left in the tree after harvest and it is in these nuts the population …

2023-2024 Winter Chill, Dormancy & Walnut Management Update

Walnuts are one of the highest chill requirement tree crops in California. Though it’s easy to forget given the luxuriously high amounts of chill last year, multiple recent winters have fallen short of the chill accumulation needed for a tight, economical walnut bloom (e.g. 2014, 2015, 2020). Inadequate winter chill accumulation can result in delayed budbreak, scattered or prolonged budbreak …

Preventing Bacterial Blast Damage in Almond This Year

In 2023, the cold, wet weather during bloom and leaf-out resulted in bacterial blast damage in many Sacramento Valley almond orchards. If conditions this year are cold and wet during bloom, we may see a recurrence of blast: make a plan now to keep blast damage to a minimum. The Bottom Line: Bacterial blast can be a problem when cold, wet conditions …

2023 UCCE Blackeye Bean Variety Evaluation

UC Cooperative extension experts led by Michelle Leinfelder-Miles evaluated blackeye bean varieties in a commercial field in Stanislaus County in 2023. The season began with cool and wet spring conditions, which lasted through the month of June and delayed planting. Seven varieties from the University of California blackeye breeding program were planted on July 7th. The varieties were grown on …

UCCE 58th Annual Sweetpotato Meeting

Save the date, Thursday February 8, 2024, for the UC Cooperative Extension 58th Annual Sweetpotato Meeting to take place at the UCCE Classroom (2145 Wardrobe Ave., Merced).  Growers and industry stakeholders are invited to attend and gain research updates on sweetpotato production and marketing in California. Doors open at 7:30 a.m. where attendees can sign-in, and enjoy some coffee and …

Bacterial blast/canker: What do we know?

Diseases caused by Pseudomonas syringae can affect tissue throughout the entire tree, including bacterial blast of flowers, leaves, and shoots as well as bacterial cankers that develop under the bark in cambial and wood tissues of trunks, scaffolds, and branches. The pathogen commonly exists on plant surfaces in an orchard without causing disease, but cold, wet weather can trigger damaging infections. Bacterial canker/blast …

Be Careful with Almond Variety-Rootstock Selection

Almond variety and rootstock selection is a quarter century investment. After choosing which crop type to plant, this is likely the most important decision you will make when planting a new orchard. The difference in results is massive. A poor selection could lead to the orchard failing to establish and needing to be removed or providing sub-standard yield for the …

Video Released on Nitrogen Management in California Processing Tomatoes

Efficient nitrogen fertilization management for all irrigated crops is gaining much attention as the Irrigated Lands Programs in the Central Valley and Central Coast begin efforts to minimize nitrate movement past the root zone of fruits, nuts and vegetables. The first in a series of seven educational videos on nitrogen fertilizer management is now available online. The video series is …

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