44() REPORT OV OFFICE OF EXPERIMENT STATIONS. 



Kerosene ciimlsion jxmi-cd into the openinj^'s of a nest just after a rain 

 is also etfeetive in killin*^- or driving awav tlu* ants. Fi-csh air-slaked 

 lime placed close about the base of the trunk will for a time hinder 

 the ])r(U'essions. (Moth banda<;es tai'red or wet with (•rcolin, corrosive 

 sublimate solution, or erud«> earbolic acid solution ai'c of some tempo- 

 rary value only; the two latter should l)ea])[)lied o\('r a j)lain bandage 

 of cotton battin*^-. 



The larva» of a weevil determined as EivopldJml mu^ xpenijleri was 

 found eatino- the bark from the taproots of oranjj-e stock in a nursery 

 near Kio Pitnlras, The adult insect is conunon throu*^iiout the island 

 not only on citrus stock, but on nearly all kinds of fruit trees. A 

 handful of air-slaked lime at the foot of the tree deters the female 

 from enterino' the ground to deposit her eggs at that point. Hand 

 picking will probably- be found necessary to keep this pest in check 

 for the next few years. 



During the drj-^ season two species of Lam«>Ilicorn ])eetles seriousl}'^ 

 damage the foliage of citrus stock and bananas. A boy with a lantern 

 and a pail containing a little kerosene and water can easih' collect a 

 large per cent of these insects in an orchard l)y visiting the trees in 

 the earh' part of the evening; for large trees a sheet spread under the 

 branches may be used by two or three boj^s to better advantage. 



INSECT ENEMIES OF MISCELLANEOUS FRUIT TREES. 



Dkuipis pentagona has proved very destructive to peach trees in the 

 east part of the island; this species also attacks nnil berry and papaw. 

 Although not difficult to control, the native makes no attempt to rid 

 his dying papaws of this "piojo'' (louse). 



Aleid'odicus imninia injures the wild guava {l^.sldiain yiuiyaca) in 

 some localities. 



A-sterolecanium piistxilans has appeared on the fig {Flcus carlca) at 

 the experiment station. 



An undetermined scale (Vinsonia?) occurs on the rose apple {Jani- 

 hosa jai)JK>.'<). 



The Guaniibano {Anona muricata) is everywhere affected with 

 Leainhnii J(c)ni.Kj)h3eTicum; and an aphid frequently joins its efforts 

 to weaken the tree, and by its habit of attacking the flowers prob- 

 ably prevents the "setting" of many fruits. 



A thrips and a Dactjdopius have injured Pajuil seedlings {Aruicar- 

 dium occidentale) in our nurseries; a few of the plants were killed in 

 spite of kerosene emulsion treatment. 



An aphid appeared on the Castilloa plants, but was exterminated by 

 a lace-wing fly (Chrysopa?). 



The flower clusters of cacao {Theohroma cacao) are frequently 

 attacked by a brownish aphid, and the punctured and weakened pedi- 



