164 EXPERIMENT STATION RECORD. 



The apple aphis (Aphis mail) seems to confine its attack mostly to 

 young trees, and is attacked by a disease probably of bacterial nature 

 that destroys large numbers during the latter part of the summer. 

 The bodies shrivel up, turning to a dark-brown color, and remain on 

 the leaves. The woolly aphis (Schizoneura lanigera) is thoroughly estab- 

 lished and is especially favored by the character of the Nevada climate. 

 In many orchards uninfected trees are the exception. Mytilaspis porno 

 rum has not yet been found in the State on fruits, but has been taken 

 from the Lombardy poplar in Carson City. Other insects treated are 

 as follows: Flat-headed apple-tree borer (Chrysobothris femorata), pear 

 and cherry slug (Selandria cerasi), imported cabbage butterfly (Pieris 

 rapa), mourning-cloak buttertiy (Euvanessa antiopa), hollyhock butter 

 fly (Vanessa carya), hop-vine butterfly (Grapta satyrus), tomato worm 

 (Phlegethontius celeus), poplar hawk moth (Marumba modesta), locust- 

 tree carpenter moth (Prionoxystus robinia'), codling moth (Garpocapsa 

 pomonella), ash-gray pinion (Lithophane automata), currant-stem borers 

 (Sesia tipuli/ormis, Chrysobothris femorata), cabbage plusia ( Plusia bras- 

 sica), corn-ear worm (Heliothis armiger), zebra caterpillar (Mamestra 

 picta), cutworms, diamond-back moth (Plutella cruciferariim), snowy 

 tree cricket ((Ecanthiis niveus), plant lice (Aphis sx>l>- ), apple-leaf louse 

 (A. mall), woolly aphis (Schizoneura lanigera), cabbage louse (A. bras- 

 sicce), plum-leaf louse (A. prunifolii), rose-plant Jouse (Aphis sp. '?), 

 currant-leaf louse (A. ribis), elm-leaf louse (Aphis sp.?), cotton wood - 

 leaf louse (Aphis sp.?), poplar-leaf gall louse (Pemphigus sp.?), willow- 

 stem louse (Lacknus sp.?), San Jose scale (Aspidiotus perniciosus), 

 English-walnut scale (Aspidiotus juglans-regioe), oyster-shell bark louse 

 (Mytilaspis pomorum), Lecanium ribis, cottony maple scale (Pulvinaria 

 innumerabilis), imported elm-bark louse (Gossyparia ulmi), rose-leaf 

 hopper (Typhlocyba rosce), buffalo tree hopper (Ceresa bubalus), red 

 spider (Tetranyehus tclarius). 



Insect injuries to Ontario crops in 1896, J. Fletcher (h'pt. 

 Ontario Ent. Soc. 1890, pp. 58-00, Jigs. 15). — Cereals were attacked by 

 the wheat-stem maggot (Meromyza americana), American frit fly ( Oscin is 

 variabilis), Hessian fly (Cecidomyia destructor), wheat midge (Diplosis 

 tritici), grain aphis (Siphonophora arena), and army worm (Leucania 

 unipuncta). 



Fodder crops were attacked by three common species of grass- 

 hoppers—the red-legged locust, two striped locust, and the lesser 

 migratory locust. In some cases they were reported to have dis 

 appeared suddenly. This was doubtless due to the increase of their 

 natural enemies — Empusa grylli, tachina flies, and locust mites (Trom- 

 birfiitm locustarum), which seem to be the most efficient workers in 

 keeping down the numbers of grasshoppers. This mite is discussed 

 somewhat at length Another parasite of grasshoppers noted is the 

 hair snake or hair worm. Other insects noted are gray blister beetle 

 (Macrobasis unicolor), clover-root borer (Hylesinns trifolii), clover seed 



