vin DISEASES AND ENEMIES 267 



not necessary to spray the foliage, but only the stem 

 and the thicker branches, especially the "fork" and 

 the foot of the stem of the young trees. In the dry 

 season, when the branches used as traps dry up rather 

 quickly, the traps must be renewed every two or three 

 weeks, and the used ones burned. Branches pruned off 

 the cocoa can also be used as traps in the same way. 



In order to kill the larvae, Guppy recommends the 

 injection of a small quantity of carbon bisulphide into 

 the tunnels by means of a small syringe ; the aperture 

 must immediately be filled up with clay. This method, 

 however, is not always successful. 



In the meantime the 

 beetles must be picked off 

 as thoroughly as possible. 

 They may be found on the 

 trees as well as on the 

 traps, and the keenest boys 

 and women should always 

 be used for this work. It 

 is advisable to pay them 

 according to the number 



of beetles Caught. FIG. 88. The Glenea borer 



The Glenea l)OTer (Glenea novemguttata}. 



(Glenea novemguttata) 1 is 



the most common and most destructive kind of borer 



in Java. 



The beetle is no longer than about 11 mm. (^ inch), 

 blackish coloured, often with a blue metallic lustre, 

 with four spots of a yellowish white colour on each 

 side of the thorax (Fig. 88). The larvae are larger, 

 attaining a length of about 30 mm. (1'2 inch), and 

 are yellowish white in colour. 



The beetle lays its eggs one after another in the 

 bark of the cocoa tree, making a separate incision for 

 each egg. Thus the eggs are concealed, and can only 

 be detected by very close and very careful investigation. 



1 Zehntner, Bulletins 1 and 3 of the Cacaoproefstation, Salatiga (1901) ; 

 Roepke, Bulletin 1 of the Proefstation, Midden Java (1911). 



