West Coast Nut disease Archives - westcoast_nut



Distribution of Chlorosis in Almond Orchards

Distribution of Chlorosis in Almond Orchards

By: Elizabeth J. Fichtner, Farm Advisor, UCCE Tulare and Kings Counties; Mae Culumber, Farm Advisor, UCCE Fresno County, Bruce Lampinen, Extension Specialist, UC Davis The first step in assessing the cause of canopy chlorosis and decline in an orchard is mapping the distribution of the symptoms. If a pattern of chlorosis is similar across irrigation lines, then the cause of the problem may be related to over—or under—watering. Two scenarios present themselves regularly during summer farm calls: a) terminal tree chlorosis, and b) within row tree chlorosis (Figures 1 and 2). Figure 1. A) Chlorosis of end tree indicates excessive...

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Best Management Practices for Fungal Disease in Almonds

Best Management Practices for Fungal Disease in Almonds

By: Cecilia Parsons, Associate Editor Fungal disease management in almonds requires year-round vigilance.   The overall process for integrated pest management of fungal diseases calls for knowledge about the life cycle of the disease, the crop and environmental triggers.   Emily Symmes, University of California Cooperative Extension (UCCE) Integrated Pest Management (IPM) advisor in the Sacramento Valley,  said actively assessing all stages of a fungal disease, monitoring and tracking weather patterns will help growers be proactive in disease management.   Speaking at the Mid Valley Nut Conference in Modesto, Symmes noted one more key components of a good IPM program is...

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Everything you Need to Know About Thousand Cankers Disease of Walnuts

1,000 Cankers Disease: Everything You Need to Know For Walnuts

By:  Mohammad Yaghmour, Area Orchard Systems Advisor Kern Co and Elizabeth Fichtner, UCANR Advisor Tulare and Kings Cos The walnut tree (Juglans sp.) is well known for its valuable wood and timber quality and its nutritious nut.  Different native species of walnut are an important part of the ecological system in North America.  Eastern black walnut (Juglans nigra) is native to eastern North America from the northeast in Vermont and southern Ontario to Minnesota and south to Florida.  It also ranges east from the Atlantic coast to central Texas except the Mississippi River Valley and Delta.  Juglans nigra has an...

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Almond Disease and Control

Almond Disease and Control

By: Julie R. Johnson, Contributing Writer From planting to maturity and crop production, almonds trees can be host to a plethora of diseases, be it bacterial, fungal, viral, parasitic or phytoplasmal. These diseases and how to control them was the topic of Dr. Jim Adaskaveg's presentation during this year's North Valley Nut Conference hosted by West Coast Nut in conjunction with the UCCE Butte/Glenn Counties Almond and Walnut Day at Silver Dollar Fairgrounds in Chico. Adaskaveg, professor and plant pathologist with the Department of Plant Pathology, UC Riverside, who specializes in foliar disease of almonds and other tree crops, shared the...

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Blight Control in Walnuts

Blight Control in Walnuts

By, Julie R. Johnson, Contributing Writer Blight's description “as any cause of impairment, destruction or ruin,” definitely applies to Xanthomonas arboricola pv juglandis (Xaj), a pathogen of Walnut Blight and the topic of Richard Buchner's presentation during this year's annual Walnut Trade Show hosted by West Coast Nut. Buchner, UCCE Orchards Advisor, Tehama County, said walnut blight caused by Xaj can cause significant crop loss and determining an orchard's risk is often a matter of guess work. “Three things are necessary for the disease to occur,” he explained, “pathogen, host and favorable weather. This is often referred to as the disease...

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