20 METHODS OF CONTEOL FOR WHITE GRUBS. 



Given, however, a grubby field, the method of treating may be with 

 a shovel, taking out a shovelful of earth, so that a pinch of the spore- 

 laden soil may be dropped in and covered. This inoculation should be 

 no more than a chain or so apart in the field, the closer the better, for 

 quick results. An easier method of aji plying would be when ploughing. 

 By having a tin of the inoculating soil on the plough, a pinch could easily 

 be dropped here and there in the furrow — say, about every tenth row or 

 closer, if the spore-laden soil was easily procurable. 



Let me finally advise, however, that immediate results must not be 

 looked for. A few dead grubs may be found from time to time ; but the 

 hope that I am working on is the unusual season, such as that of 1920, 

 when the presence of the spores over most of the infested cane areas would 

 .probably do much toward a marked reduction in this terrible pest. 

 Furthermore, since I am compelled shortly to give up the investigation 

 of this tremendously important problem — control of the pests of sugar- 

 cane, due to which the industry loses hundreds of thousands of pounds 

 annually — I wish to recommend for the benefit of those most interested, 

 the further introduction of other similar friendly organisms. I have 

 had considerable correspondence on the subject, and would urge immediate 

 investigation in Java. They have two species of grub-destroying bacteria, 

 which might prove very beneficial here, since our rains come at the time 

 that the grubs are active. At the same time, it would be possible to 

 collect and breed a number of other natural enemies of the grubs, for 

 introduction here. The Philippine Islands are also a rich source of 

 similar organisms, as demonstrated by the Hawaiian Sugar Planters' 

 entomologists. If we consider the economical production of sugar, 

 the introduction of friendly organisms will be pushed as speedily as 

 possible. 



By Authority: Anthony .Jamks Cummi.nu, Uovernmeut Printer, Brisbane. 



