COLONI/ATION. 



{■> 



lil)C'rat(Ml at the sjuu(> time, and in tliis case the iiinnlx-r of larva- lib- 

 erated is ol'toii i(>(luco(l ()ii(>-liaH". 



Tlie method of liberating iield eolonies ol" Calosonui l)eetles lias de- 

 l)ended on whether adults or larviv were to be planted. When adults 

 were used, they were taken to the area selected and seattered about 

 amono; the badly infested trees. 



More care was required in distributing::: larval colonies as it was neces- 

 sary to pack the larvfe se])arately so that they would not injure each 

 other before they were turned loose. 



In 1909 the larvte were placed separately in glass tubes, both ends 

 of which were plugged with cotton. Before inserting the last plug, a 



Fig. 21. — Two Inmilrcd IiiIk's, cacli (umtaiiiiiiy: ii hirvn of ('(iliiaoiiKt i-!icui)l(a))tu, ri-sidy for coloniza- 



tion. (Original.) 



small amount of earth and sometimes a cateri)illar or pupa was added 

 with the beetle larva. Tiiese tubes were packed in a basket and taken 

 to the place where the colony was to be liberated. (See fig. 21.) On 

 arrival the contents were dumped at the base of infested trees and the 

 tubes returned for refilling. Frequently the tubes became broken in 

 handling and transit, and occasionally some of the larva? made their 

 way through the cotton plugs and escaped. 



In 1910, a better device was used (fig. 22), which consisted of sev- 

 eral units of wood in which was bored a double row of 1 holes, so that 

 each block would accommodate 20 larva\ The bottom of the block 



