Publications by authors named "H F Avenot"
Article Synopsis
- Boxwood blight is an aggressive disease caused by Calonectria pseudonaviculata, first identified in the US in 2011, and has since impacted over 90% of boxwood production across 30 states.
- The study examined weekly monitoring data from two locations (Virginia and North Carolina) over four years to assess environmental factors influencing blight, noting it peaked in late summer and early fall with significant influences from rainfall and humidity.
- Findings revealed that using leaf wetness sensors for disease predictions yielded more accurate results than previous algorithms, enhancing understanding of the disease and helping to improve mitigation strategies.
Botryosphaeria branch canker and dieback of avocado ( Mill.) has expanded in avocado-growing areas in recent years. Twenty-one avocado groves in the major producing regions of California were surveyed in 2018 and 2019.
View Article and Find Full Text PDFTrunk and scaffold canker diseases (TSCDs) of almond cause significant yield and tree losses and reduce the lifespan of orchards. In California, several pathogens cause TSCDs, including Botryosphaeriaceae, , , , , , , and spp. Field diagnosis of TSCDs is challenging because symptom delineation among the diseases is not clear.
View Article and Find Full Text PDFIn this study, a mycelial growth assay was used to evaluate the sensitivity to thiophanate-methyl of 144 isolates (collection A) from Californian vineyards and pistachio and pomegranate orchards. Based on the effective concentration that inhibits 50% of growth (EC) values for mycelial growth inhibition on fungicide-amended media, 3, 28, 10, and 58% of the isolates showed sensitivity (SS; EC < 1 µg/ml), low resistance (LR; 1 < EC < 10 µg/ml), weak resistance (WR; 10 < EC < 50 µg/ml), and high resistance (HR; EC > 100 µg/ml) toward thiophanate-methyl, respectively. The LR and HR phenotypes were observed in pistachio and pomegranate orchards, even though pomegranate was not sprayed with thiophanate-methyl.
View Article and Find Full Text PDFAlternaria late blight (ALB) caused by spp. is an annual disease problem in California pistachio and requires repeated applications of fungicides to prevent significant losses of pistachio foliage and nut quality. From 2003 onward, the succinate dehydrogenase inhibiting fungicide boscalid has played a key role in ALB management.
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