Alternaria alternata Causing Brown Spot Disease on Walnut in Xinjiang, China.

Walnut is one of the Xinjiang’s characteristic dried fruits and the main source of income for farmers in walnut growing areas. In September 2019, Juglans regia leaves with brown spots were observed in a 10 hm2 orchard in Hotan area, the diseased leaf rate reached more than 25%. The leaf lesions were suborbicular to irregular, […]

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 […]