va e , ▁which ▁feed ▁on ▁the ▁roots . ▁Ad ult ▁can e ▁be et les ▁have ▁a ▁heavy ▁ex os ke leton ▁and ▁their ▁eggs ▁and ▁lar va ▁are ▁often ▁buried ▁under ground , ▁making ▁them ▁difficult ▁to ▁ex termin ate . ▁Furthermore , ▁conventional ▁methods ▁of ▁p est ▁control , ▁such ▁as ▁p estic ide ▁use , ▁would ▁er ad icate ▁har ml ess ▁species ▁of ▁insect s ▁as ▁well , ▁making ▁it ▁an ▁uns atisf actory ▁method . ▁ ▁C ane ▁to ads ▁were ▁to ▁replace ▁the ▁use ▁of ▁p estic ides ▁like ▁ar sen ic , ▁pitch ▁and ▁co pper . ▁ ▁The ▁success ▁of ▁using ▁the ▁moth ▁C act ob last is ▁c actor um ▁in ▁cont rolling ▁pr ick ly ▁p ears ▁in ▁Australia ▁also ▁contributed ▁to ▁hopes ▁for ▁the ▁can e ▁to ad . ▁ ▁The ▁can e ▁to ads ▁b red ▁immediately ▁in ▁capt ivity , ▁and ▁by ▁August ▁ 1 9 3 5 ▁more ▁than ▁ 1 0 2 ▁young ▁to ads ▁were ▁released ▁in ▁areas ▁around ▁C air ns , ▁Gordon v ale ▁and ▁Inn isf ail ▁in ▁northern ▁Queensland . ▁More ▁to ads ▁were ▁released ▁around ▁Ing ham , ▁A yr , ▁Mack ay ▁and ▁Bund ab erg . ▁Re leases ▁were ▁tempor arily ▁limited ▁because ▁of ▁environmental ▁concerns ▁but ▁res umed ▁in ▁other ▁areas ▁after ▁September ▁ 1 9 3 6 . ▁Since ▁their ▁release , ▁to ads ▁have ▁rapidly ▁multip lied ▁in ▁population ▁and ▁now ▁number ▁over ▁ 2 0