65 



GUAVA ATTACKED BY ALEYRODES. 



The Guava is attacked by a species of Alcyrodcs, 

 Alkyrouicus Cocois Curt., which is the only genus of the family 

 Ai.EYRODiD.K intermediate in systematic position between the 

 plant lice or scale insect (Coccid^e). If you observe the leaves 

 of the guava thus attacked, you will find the young, filed in 

 order along the nerves of the leaves, and a species of ant 

 PRENOLEns LONGicouNis iiTR. busily engaged attending to them. 

 These ants derive their sustenance from sucking the honey dew 

 emitted by the Aleyrodicus. The knot-like projections on the 

 guava leaves (tig. 3 c.) are the females of a very common cosmo- 



^%- 



FIG 3. 



(a) Leaves attacked by insect. {b) Adult insect magnified. 

 (c) Gnat size, (rf) Prenolepis longicornie. (e) Lecanium hemisphfericum 



politan scale insect known as Lecanium hemispilericum Targ. 

 It can be readily killed, as Avell as the aleyrodcs, at the proper 

 time of the year by spraying with dilute kerosine enuilsion made 

 as follows : 



Kerosine 



Soap 



Water 



Igal. 

 lib. 



2 calls. 



By beating the above properly it forms an emulsion ; mix one 

 part of the emulsion Avith 18 parts of water. This solution can 

 also be u£cd with success Jbr croti)ns and gi;ava trees thus 

 aftected. 



II. CAEACCIOLO. 



