Viroids and Satellites

Viroids and Satellites

2017, Pages 217-228
Viroids and Satellites

Chapter 21 - Apple Scar Skin Viroid

https://doi.org/10.1016/B978-0-12-801498-1.00021-8Get rights and content

Abstract

Apple scar skin viroid (ASSVd) causes serious pome fruit diseases such as apple scar skin, dapple apple, pear rusty skin, pear fruit crinkle, and pear dimple fruit. Diseased apple and pear fruits are unmarketable. The viroid may also be latent in some pear cultivars without causing a disease. ASSVd was reported from many countries, especially those of East Asia. It naturally infects different species of apple and pear as well as apricot, peach, sweet cherry, and Himalayan wild cherry. Nucleotide sequences of several ASSVd variants from different hosts were determined and comparative sequence analyses were made. Using genetic engineering approaches, ASSVd is transmitted to herbaceous plant species. The viroid is also transmitted by the greenhouse whitefly to herbaceous hosts. Other means of transmission, detection, and control are similar to those of other temperate fruit tree viroids.

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