IN NICARAGUA 



181 



The kerosene emulsion preparation can also be applied for the 

 Lecaniodiaspis, of which only a few specimens were found on the twig 

 which you sent. 



Yours truly, 



F. H. CHITTENDEN. 

 Acting Chief, Bureau of Entomology, 

 Washington, D. C. 



Another possible enemy to the Castilloa that the alert planters were 

 seeking information about, was a wood borer which attacked the tree 

 where the self-pruning branches broke off, and occasionally where the 



STERN OF "NAT, JR." 



bark was cut or wounded. The larva of the insect are large grubs, that 

 after penetrating the outer bark burrow upwards inside of the cambium, 

 and then straight through the wood, completely honeycombing it so 

 that the trees break short off when very little wind comes. This does 

 not always kill the tree, but it sets it back appreciably. These borers 

 appear to be most active during the months of June and July. The 

 planters, for a remedy, were using a mixture of tar, kerosene oil, black 

 oil and sulphur. This killed the grub if it touched it, but it was very 

 difficult to reach it because of the length of the burrow. A suggestion 

 for keeping the borers out was to have a gang of men constantly going 



