In article , solaara solaara.1uye82@
gardenbanter.co.uk writes

my begonias were ruined this year by caterpillars..I don't know what
sort, but I found two hairy caterpillars on the nearby plants..What can
I do next year to prevent this happening.......


Caterpillars are usually pretty specific as to food plant - it's
unlikely that they'll move from one plant to another unless both are
favoured food plants.
--
Kay
"Do not insult the crocodile until you have crossed the river"