THE PEAR THEIPS IN CALIFORNIA. 



ever, were found to be (Euihrips) Frankliniella occidentals Pergande 

 and (Euihrips) Frankliniella tritici Fitch, neither of which is particu- 

 larly injurious to deciduous fruits. Reports of injury supposed to 

 have been caused by this species were received from the Rogue River 

 Valley in Oregon, but a critical examination, in 1909, showed no 

 signs of the work of the pear thrips. In the spring of 1910 many 

 larvse of (Euihrips) Frankliniella tritici were 

 found, but none of the species under consid- 

 eration could be obtained. 



Not until the year 1911 was the pear thrips 

 positively known to be present in the United 

 States outside of the infested districts of Cali- 

 fornia. However, in the spring of 1911 Mr. 

 P. J. Parrott found it in considerable numbers 

 around German town and other points 

 along the Hudson River in New York. 1 

 Later in the year specimens of 

 (Euihrips) Tsenioihrips pyri 

 were found among some Thy- 

 sanoptera which had been col- 

 lected in the spring 

 by Mr. Parrott in the 

 vicinitv of Geneva, 

 N. Y. 



In May, 1912, Mr. 

 A. L. Quaintance sent 

 the authors a number 

 of specimens of thrips 

 collected in pear blos- 

 soms from six differ- 

 ent orchards by Mr. 

 Fred Johnson at North East, Pa. All proved to be the pear thrips, 

 {Euihrips) Tsenioihrips pyri. 



In 1909 Bagnall 2 reported that numerous examples of this very 

 injurious species, taken in plum blossoms at Evesham, England, had 

 been sent to him by Mr. Walter Collinge. So far as we know, this 

 and the previously mentioned account by Theobald are the only 

 published reports of the occurrence of this species outside of the 

 United States. 



Two other species of Thysanoptera (Thrips physapus L. and T.fiava 

 Schrank) are mentioned by Carpenter as the "pear-blossom thrips" 



i Parrott j P. J. Occurrence of Euihrips pyri Daniel in New York State In Science, n s., v. 34, no. 864, 

 p. 94, July 21, 1911. 



2 Bagnall, Richard S. A contribution to our knowledge of the British Thysanoptera (Terebrantia), with 

 notes on injurious species. In Jour. Econ. Biol., v. 4, no. 2, p. 33-41, July 7, 1909. 



Fig. 1.— Map showing general area of infestation by the pear thrips 

 in California. (Authors' illustration.) 



