Plant diseases are caused by animal agriculture operations for the more part. E.Coli and salmonella are two big ones that were on salad greens recently. Guess what - they didn't originate from the plants. They are 100% animal (or human) based.
Manure, contaminated water, runoff - all contributing factors to "plant diseases", all issues from raising animals for food.
E. coli and salmonella aren't plant diseases. They make humans sick, not plants. Plant diseases are stuff like pseudocercospora, which are on track for eradicating the most common bananas grown today, despite attempts at quarantining affected regions to stop the disease from spreading.
You must have misread what I wrote because I never claimed that they were. I put quotes around "plant diseases" because the two major outbreaks that everybody thinks about weren't plant diseases, they were animal-related.
Manure, contaminated water, runoff - all contributing factors to "plant diseases", all issues from raising animals for food.