First report of Calonectria pseudoreteaudii in Lao PDR associated with a leaf spot disease of Macadamia integrifolia

Macadamia (Proteaceae) is a rainforest genus indigenous to Queensland and northern New South Wales, Australia. It includes four species, two of which, and their hybrids, are grown commercially for their high-value nuts in Australia and other countries. Macadamia is now being grown in several orchards and in gardens on the Bolaven plateau in southern Lao People’s Democratic Republic (PDR). In November 2018, leaf spot disease symptoms were observed on young leaves of macadamia trees in a demonstration garden 15 km west of Paksong, on the Bolaven Plateau in Champasak Province, Lao PDR. A fungus isolated from the leaf spots was identified by morphological and DNA sequence comparisons as Calonectria pseudoreteaudii . This is the first report of this species in the Lao PDR.