552 



on the bushes should be touched at the place of infestation with 

 benzine, the spot being then dabbed with tar or paint so that they 

 may be recognised. The bushes should be kept down to six feet in 

 height, as this facilitates the work. All these measures must be preceded 

 by the picking of all ripe, half-ripe and blackened berries. 



A note by Dr. W. Bally points out that it is desirable to ascertain 

 whether benzine kills the eggs, larvae and pupae as well as the adults, 

 and whether this method is practicable in the case of plantations in 

 full bearing. 



Hallauer ( — ). [The Co!lee-berry Borer.] — Proefst. Mid.- Java, 

 Salatiga, Circ. 3, 28th September 1921, 1 p. typescript. [Received 

 6th September 1922.] 



The measures recommended in the preceding paper against the coffee- 

 berry borer are being tried on a large scale in collaboration with the 

 Central Java Experiment Station. 



Hallauer ( — ). Maandelijksch Bericht over het Verloop der Proeven 

 met de Methode Van Davelaar gedurende de Maand October. 



[Monthly Report on the Experiments with Van Davelaar' s Method 

 in October.]— P/Od/s/!. Mid.- Java, Salatiga, Circ. 5, 6th November 

 1921, 2 pp. typescript. [Received 6th September 1922.] 



As described here, this method for combating the coffee-berry borer 

 differs from that originally worked out by van Davelaar [see above]. 

 The first procedure is a protective application to the berries of a solution 

 of axle grease in benzine, petroleum, or a mixture of petroleum and 

 benzine. The coating is now applied sparingly, so that it does not 

 penetrate far within the berry clusters, the result being more satisfactory 

 than with the former liberal application. This treatment is followed 

 by the application of a mixture of thick fat with 5-10 per cent, 

 petroleum in order to kill the beetles and their brood. 



Hallauer ( — ■). KoSfiebessen-Boeboek. [The Coffee-berry Borer.] — 

 Proefst. Midden- Java, Salatiga, Koffiebessen Boeboek Serie, Circs. 

 6-11, December 1921-July 1922, 8 pp. typescript. 



These circulars include information on the experiments in combating 

 the coffee-berry borer [Stephanoderes hampei] according to van 

 Davelaar's method [see above] progressively modified. One user of 

 this method records his opinion that it is practicable and economical in 

 actual plantation work in spite of the time and expense involved. 

 The first (protective) mixture is made up of six parts axle grease and 

 one part petroleum. A thin coat that does not run on to the stems of 

 the berries is applied, the brush loaded with the mixture being applied 

 first to the large berries and then to the small ones, which thus get a 

 really thin coat. The second (killing) mixture consists of one part thick 

 fat mixed with one part petroleum, and is applied to the bore-hole 

 by means of a piece of wood. The last circular (no. 11) deals with the 

 precautions needed when harvesting the coffee crop. The baskets, 

 etc., must be kept free from infestation and no blackened berries must 

 be left on the bushes or on the ground. 



