- 382 - 



3) Shake infested fruits off the higher trees they fall easily 

 .and collect and burn them. 



4) Collect at once and burn any fruits that have fallen and 

 are lying under the trees, before the larvae leave them. 



5) As the cocoons lie in the soil, from summer to the next 

 year, the soil below trees that were infested should be dug and 

 worked, the turned-up layers being beaten. 



The Pear Leaf Blister Mite (Thriophyes pury). (The Jour- 

 nal of the Board of A^riculutre, pp. 123-126. London, May 1910. 



The Pear leaf blister mite is spreading in England, doing great 

 injury and attacking other Rosaceae, the leaves of which it destroys. 

 After the leaves have fallen it is advisable to water the trees with 

 .an emulsion of petroleum to which caustic soda is added, or else 

 with a mixture made by dissolving in 10 gallons of water, 3 Ibs. 

 of lime, 3 Ibs of flower of sulphur, i Ib of caustic soda, and i Ib 

 of soap. 



F. V. THEOBALD. The Apple Sucker and its Treatment. 



(Irish Gard. 4 (1909) no. 37, pp. 34-35, figs. 8). - - E. S. R. 

 Febr. 1910 Washington. 



An account of the biology of Psylla Mali and the methods 01 

 combating it. 



R. S. MACDOUGALL. The Genus " Chermes " in its Relation to 



Forestry. (Journ. of the Board of Agric., Vol. XVI, No. 6, 

 Sept. 1909, pp. 44i-453> P ] s. 2, fig. i, Dgms. 3). 



A brief account of the species of Chermes occurring in Great 

 Britain. 



The genus Chermes confines its attacks to coniferae. The com 

 plete life history of a species may take two years. Two different 

 species of conifer being made use of. One, the primary host, is 

 typically the spruce, the other the secondary or intermediate host 

 is a Larix, Pinus or Abies. The foundresses on the primary host 

 give rise to galls. The other generations do not form any. In 

 the two years cycle there are five different generations. The three 

 chief forms in the cycle are a) wingless virgin females, b) winged 

 virgin females, c] males and females. 



