Ref1

https://books.google.com.my/books?id=iT0rAAAAYAAJ&pg=PA127&dq=Lost+Crops+of+the+Incas:+Chenopodium+pallidicaule+disease&hl=en&sa=X&ved=0ahUKEwic6NKv0dfnAhWHzjgGHd2DALEQ6AEIKTAA#v=onepage&q=Lost%20Crops%20of%20the%20Incas%3A%20Chenopodium%20pallidicaule%20disease&f=false