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Fred Runk Johnson
1886
Spraying experiments against the grape leaf hopper [Tychlocyba comes Say] in the Lake Erie Valley in 1911
The grape-berry moth
![Spraying experiments against the grape leaf hopper [Tychlocyba comes Say] in the Lake Erie Valley in 1911](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)