1910.] The Pear Leaf Blister Mite. 125 



have spread, or where attack is on a small scale, the galled 

 leaves should be collected and burned. 



2. Spraying with paraffin emulsion when the leaves have 

 fallen has been recorded as successful abroad. One corre- 

 spondent of the Board did not find the measure effective, 

 but a second correspondent found that a weak paraffin emul- 



Pear Leaf Blister Mi te {Eriophyes pyri, Nalepa.) 



1. — The Mite (greatly magnified). 



2. — An infested pear leaf, showing blisters caused by the Mites. 



sion applied towards the end of May gave good results, and 

 checked the spread of the pest. 



3. A correspondent of the Board writes: "The Pear Leaf 

 Blister Mite has been prevalent in this garden for at least 

 twenty years, but until 1907 no steps were taken to attempt 

 a cure. Two large Marie Louise Pears on a wall were 

 always badly attacked. In March, 1907, the trees were well 

 sprayed with the Woburn Paraffin Emulsion,* with the 



* See Leaflet No. 70 {Winter Washing of Fruit Trees, and the Treatment of 

 Neglected Orchards). 



