Ok so it turns out the whole of Zadoks' book is available You are not allowed to view links. Register or Login to view. .
It contains a wealth of insecticides and other plant treatments, a lot of them based on Geoponika, a 10thC encyclopedia in 20 volumes on agriculture.
The use of soap is documented there as being effective against caterpillars in particular.
The pharma section also contains the depiction of a frog on a nearby folio, and frogs eat insects...
I'm getting OT here, but perhaps it might be worth investigating the items in the pharma section as a collection of things that can be used to treat plants for various problems, and comparing that with the remedies listed in works such as Geoponika?
It contains a wealth of insecticides and other plant treatments, a lot of them based on Geoponika, a 10thC encyclopedia in 20 volumes on agriculture.
The use of soap is documented there as being effective against caterpillars in particular.
The pharma section also contains the depiction of a frog on a nearby folio, and frogs eat insects...
I'm getting OT here, but perhaps it might be worth investigating the items in the pharma section as a collection of things that can be used to treat plants for various problems, and comparing that with the remedies listed in works such as Geoponika?