The rule says get rid of one or two of the last letters and attach osis.
So varroa would chop off the oa and give varrosis which is easy to pronounce.
What the rule wants you to do is chop all the terminal vowels from the base word and add osis to what is left. That gets rid of the clumsy double vowel. A double vowel forces you to change what is a syllable as syllables in English seldom end in a vowel unless at the end of a word.
Dick
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