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Dear All,
In the past many of the manufacturers produced fold-out lookup
charts for the home gardening market with illustrations of
diseased/chewed plants, the pest/fungus responsible and their product
for treating it. These were rather useful, not least as list of what
chemicals were available. Does anyone know if any of the manufacturers
still publish such charts?

As Bob has said, the increased control of 'home use' pesticides has reduced
the spectrum available so manufacturers' ranges are effectively all the same

In terms of what causes disease/chewedness, have you looked at the ' **
Expert' series of books ? I must admit I've not looked at them recently,
but they used to be good for that sort of thing.