Sentence:  Based on preferred hosts and host plant origins it is probable that the natural distribution of the fern scale is tropical <WSD>Indo-Asia</WSD> and Indo-Australia while that of the liriope scale is coastal China, Japan and Korea. 
Meaning of the word marked with <WSD> tags:  A landmass on Earth, consisting of the Indian subcontinent and Asia proper; sometimes also including neighbouring islands of the tropics.