INJURIOUS INSECTS AND FUNGI. 283 



tender parts. There are many species of scale insects so 

 closely resembling this pest that when insects of this kind 

 are found they should be sent to the experiment station 

 entomologists for identification and suggestions as to 

 remedies. 



Remedy. This pest has been destroyed in some cases by 

 the same, but more concentrated, remedies as used for the 

 oyster-shell scale. The applications should be made more 

 thoroughly and more frequent use of the kerosene emulsion 

 during the summer. Clear kerosene sprayed upon the 

 branches iu a fine mist, so that no drops may be formed, 

 while the trees are dormant, has proved effectual in destroy- 

 ing the pest. In using clear kerosene care must be taken 

 that no drops are formed or that it does not run down the 

 branches. It is best always to use it on a clear bright day, 

 that it may evaporate rapidly and before any injury is 

 done. 



MAPLE WOOLLY SCALE (Pseudococcus aceris), Fig. 166. 

 This comparatively new insect pest has appeared in 

 several sections of the country, but thus far has been found 

 only on the soft maples. In Europe it is reported to be 

 injurious to the linden, elm, chestnut, etc. (see " Bulletin 

 N. H. Ex. Station, Ko. 36"), and should it increase in 

 this country will prove a very troublesome pest. It is 

 somewhat of the nature of the scale and aphis, sucking the 

 juices of the plant upon which it feeds; its body and the 

 masses of eggs which it lays being covered with a white 

 cottony or woolly substance, from which it takes its 

 name. 



Remedy While no experiments have been made, or at 

 least reported, to prove the value of the various common 

 insecticides in destroying this pest, from the nature of the 



