1.0Field Stationhttps://uwm.edu/field-stationField Stationhttps://uwm.edu/field-stationrich600338<blockquote class="wp-embedded-content" data-secret="a1E1MHHvbM"><a href="https://uwm.edu/field-station/bug-of-the-week/butternut-woolyworm/">Butternut Woolyworm (Family Tenthredinidae)</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://uwm.edu/field-station/bug-of-the-week/butternut-woolyworm/embed/#?secret=a1E1MHHvbM" width="600" height="338" title="“Butternut Woolyworm (Family Tenthredinidae)” — Field Station" data-secret="a1E1MHHvbM" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://uwm.edu/field-station/wp-includes/js/wp-embed.min.js /* ]]> */ </script> Sawfly larvae are fussy eaters, with many species tied to just a few host plants, and some larvae are considered pests. Larval defense strategies include communal feeding (potential predators have trouble figuring out where one larva stops and the next one starts) and spitting vile liquids from their mouths.