PLEASE ,,,,, Can anyone suggest a safe spray for food crops . My cabbages which have about 10 leaves infested by green caterpillers . I know butterflies are in short supply but is there anything I can use( other than my fingers to remove catterpillers ) to spray on cabbages to prevent this happening . never been bothered before . I grew to seedling stage , pricked out into pots , are about 6 inch high but still in greenhouse . I have no ground yet until peas are finished .