76 Bureau of Farmers' Institutes. 



12 Apple tree bark louse (Mutilaspis pomorum). Bark Infested with 

 browuisb scales shaped like 03'ster shells. Occurs ou many other trees. 

 Winter passed as white eggs under old scales, the young appearing about 

 June 1. 



Treatment: spray young with kerosene emulsion or whale oil soap 

 solution. 



13 Scurfy bark louse {Chionaspis furfurus). The whitish, scurfy scales 

 occur on the bark of fruit trees. The purplish eggs remain under old scales 

 all winter, the young appearing about June 1. 



Treatment: spray young with kerosene emulsion or whale oil soap 

 Bolution. 



14 San Jose scale [Aspidiotus perniciosus). A small circular scale not 

 readily seen unless very abundant. Infests many trees and shrubs. The 

 Bpecimens exhibited showed variations in the appearance of the scales and 

 how it may be disseminated by budding. Young appear from early June 

 till cold weather. 



Treatment: destroy badly infested trees, specially if young, and spray 

 others thoroughly in early spring with 20 per cent mechanical emulsion 

 of crude petroleum, kerosene emulsion or whale oil soap solution. Fumi- 

 gate with gas. 



15 English, oyster scale {Aspidiotus ostreceformis). Resembles San Jos6 

 scale in appearance and like it infests fruit trees. Occurs in several 

 localities in this State and should be guarded against. 



Treatment: spray infested trees with kerosene petroleum or emulsion, or 

 whale oil soap solution. Fumigate with gas. 



16 Putnam's scale {Aspidiotus ancylus). Resembles the two preceding 

 species, but is less injurious. Attacks various trees. 



Treatment: same as preceding. 



Small Fruit and Vine Insects. 



17 Currant worm {Pteronus ribesii). Greenish, black dotted saw fly 

 larvae feeding on currant leaves in May, the common currant worm. 



Treatment: spray with hellebore. 



18 Currant span worm {Diastictis ribearia). Yellowish, black dotted 

 span worms feeding on leaves in May and June. 



Treatment: spray with poison or handpicking. 



19 Currant stem borers {Sesia tipuliformis, Janus integer, Tenthredo rufo- 

 pectus). The caterpillars boring in the woody stems are sesians. The 

 maggots working in the tender tips may be either those of Janus or 

 Tenthredo. 



Treatment: burn stems infested with sesians and the wilting tips 

 Infested by the others. 



