First report of Lasiodiplodia pseudotheobromae causing husk rot in macadamia.
In 2016, husk rot symptoms were observed in macadamia (Macadamia integrifolia) trees in Guangxi, China. Husk rot symptoms were characteristically diffuse, soft and spongy black lesions up to 10 mm in diameter clearly discrete on the green fruit pericarp. Then cracking occurred, resulting in fruit drop, seriously affecting the yield of macadamia nuts. The causal pathogen was isolated and identified as Lasiodiplodia pseudotheobromae based on morphological, molecular and pathogenicity analyses. The obtained sequences were deposited in GenBank (accession nos. MH487656, MH487654 and MH487655). This is thought to be the first report of L. pseudotheobromae on this host in the world.