Concept:The correct spelling of a vine-pest genus is based on the English word ‘Phylloxera’, which refers to insects that damage grapevines.Explanation:The word ‘Phylloxera’ comes from Greek ‘phyllon’ (leaf) and ‘xeros’ (dry).Among the options, only ‘Phylloxera’ matches the standard spelling.Option B ‘Phylloxerae’ is a wrong plural or possessive form.Options C ‘Philoxera’ and D ‘Phyloxera’ have missing or swapped letters.Therefore, the correct choice is A.Answer:Option A. Phylloxera