34 



Tul)evcles of S(>gments 5-10 almost completely l)Iaek- 



margined ( Dianella odorata) monogratnnia. 



Besides above mentioned spots, 4 or 5 otiier Mack 

 spots on each lol)e of the head. 



Lateral lobes of cervical shieM not bhick-margined. 

 Tul)ercle i of segment 3 verj^ strongly l)lack-marked 



anteriorly (Sedge: Carex oahiieiisis) anastrepta. 



Tubercle i of segment o not strongly black-marked 



(Sedge: Rhyncospora thyrsoidea) antidoxa. 



T^ateral lobes of cervical shield strongly black- 

 margined. 

 The black eyespot has a considerable extension up- 

 ward on side of head (Bean vines and "wiliwili" tree) 



vionogona. 



20 (I'J) No extension of the black eyespot upward on the side 



of head (Palms, especially coconut, and banana) 



blackbiirni. 



REMEDIES. 



Arsenical sprays such as Paris Green and Arsenate of Lead 

 should be more or less effective against leaf-rollers when they 

 become destructive. There would be great difficulty in applying 

 these in cane fields, however, except in young fields where the 

 cane has but a few months' growth, and small enough not to !>(> 

 broken down by a spraying -cart. Of course it is in the younger 

 cane the destruction by leaf-rollers will be greatest, as the amount 

 of eating they would do on small shoots has greater eft'( ct in 

 crippling it for furtlier growth. Larger cane is better al)le to 

 withstand some loss of leaves without any particular injury. 



So far as I know, no trials have been made to determine how 

 expensive, or how effective, the use of poisons may be in the 

 control of this pest. At present, the natural enemies havt' made 

 the damage by leaf-rollers less severe than in f(n-mer years, as 

 indicated by occasional reports of very serious injury by them in 

 the past. But even with this usually etticient control by parasites, 

 there may be times when certain fields of young cane appear to 

 be becoming too seriously attacked by leaf-rollers, and spraying 



