EXPERIMENT STATION EEPORT. 



521 



Mites in general were very abundant on quite a variety of 

 foliage and caused a good deal of spotting of leaves on peach, 

 cherry, oak, chestnut and quite a number of other trees. These 

 mites are very small creatures, generally knowTi as red spiders, and 

 they often do serious harm or cause a yellow, sickly appearance of 

 the infested leaves. They are most abundant on tlie under sides 

 and their eggs may be found on the bark of the twigs and branches 



Fig. 1. 



A mite : Tetmnychus mytilaspidis. 1, the eggs on the under surface, usually laid close 

 to a vein ; 2, the six-legged young just hatched ; 3, the adult mite, just visible to the un- 

 aided eye : much enlarged. " Original. 



during the winter. Sulphur is a very satisfactory remedy as 

 against them, and any of the diluted sulphides may be employed 

 as a spray. In the greenhouse flowers of sulphur may be dusted 

 on the ground beneath infested plants. 



The pear psylla. — In the report for 1905 mention was made of 

 some Keilfer orchards in Cumberland county in which this insect 

 had catised injury, and these orchards were revisited in March by 



