Susceptibility of almond (Prunus dulcis) cultivars to twig canker and shoot blight caused by Diaporthe amygdali.

Twenty-five almond cultivars were assessed for susceptibility to Diaporthe amygdali, causal agent of twig canker and shoot blight disease. In laboratory experiments, growing twigs were inoculated with four D. amygdali isolates. Moreover, growing shoots of almond cultivars grafted onto INRA 'GF-677' rootstock were used in four-year field inoculations with one D. amygdali isolate. In both […]

Mutations in Sdh Gene Subunits Confer Different Cross Resistance Patterns to SDHI Fungicides in Alternaria alternata Causing Alternaria Leaf Spot of Almond in California.

Alternaria leaf spot caused by Alternaria alternata and A. arborescens is a common disease of almond in California. Succinate dehydrogenase inhibitors (SDHIs) are widely used for its management, however, we observed reduced performance of SDHI fungicides at some field sites. Thus, we evaluated the sensitivity of 520 isolates of the main pathogen A. alternata from […]

Comparative Profiling of Wood Canker Pathogens from Spore Traps and Symptomatic Plant Samples within California Almond and Walnut Orchards

Fungi causing wood canker diseases are major factors limiting productivity and longevity of almond and walnut orchards. The goal of this study was to compare pathogen profiles from spore traps with those of plant samples collected from symptomatic almond and walnut trees and assess if profiles could be influenced by orchard type and age, rainfall […]