Scots to watch out for poisonous caterpillars which can cause sickness and rashes The greatest risk period is May to July when the caterpillars emerge and feed before turning into adult moths. Updated Scots are being urged to stay clear of the bugs Join thousands of others in getting the stories that matter to you sent straight to your inbox.Invalid EmailSomething went wrong, please try again later. Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice