How many letters does the top answer for “larva of chalcid flies injurious to the straw of wheat and other grains” have?

The most common answer is jointworm (9 letters).

Crossword clue: larva of chalcid flies injurious to the straw of wheat and other grains

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

jointworm 9 letters wn-def

larva of chalcid flies injurious to the straw of wheat and other grains

strawworm 9 letters wn-def

larva of chalcid flies injurious to the straw of wheat and other grains