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Disease



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 springtime diseases of almond that can be problematic in a wet spring season are blossom blight, jacket rot, anthracnose, shot hole and bacterial spot. Late spring-summertime diseases include scab, alternaria, leaf spot, anthracnose, rust and hull rot. In an effort to control these and other almond diseases, Adaskaveg emphasized monitoring and risk assessment by determining...

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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 triangle.” One of Buchner’s “take home messages,  is when it comes to walnut blight, the past few years drought and sunshine can be a benefit in controlling Xaj, while this year's rainfall can increase the threat of the disease. “Beware, once the rain events start to come in,” he said, “and these bacteria start building...

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