THE CARROT RUST FLY 5 



New Hampshire. — A single specimen of P. rosae in the National Museum was 

 collected at Franconia, New Hampshire, in 1902, but it was not recorded as 

 causing damage to carrots until 1915 at Manchester. At present, this insect has 

 been found in eleven towns in the State and undoubtedly it would become a 

 serious pest if carrots were grown more extensively. 



Washington. — Specimens in Dr. A. L. Melander's collection were taken in 

 May 1908 at Nooksack, Whatcom County, and in May 1910 from Olga, on an 

 island in Puget Sound. It was first reported as injuring carrots in 1929 and has 

 increased in destructiveness each year. In 1936 it was found in Lewis County 

 near the Columbia River, and most carrot plantings in the Puget Sound section 

 were infested. 



Massachusetts. — The first flies reported in Massachusetts were reared in 

 September 1913 from maggots in carrots grown near Haggett's Pond, Andover, 

 and are now in the Boston Museum of Natural History. From 1926 to 1930, 

 however, infested carrots were observed and reported throughout the State, and 

 during this period vegetable judges at agricultural fairs where the best carrots 

 were displayed reported injury by the carrot rust fly in nearly every county. 

 In fact, it was difficult to purchase in the market local grown carrots which were 

 entirely free from evidence of attack. Since 1930 injury by this pest, although 

 still to be found, has decreased greatly. 



Vermont. — Although no records of injury to carrots are available from Vermont, 

 specimens in the Boston Museum of Natural History were collected at St. Albans 

 in 1913 and at Bennington in 1915. 



Michigan. — Infested carrots at Sault Ste. Marie, found in June 1914, constitute 

 the first record of this pest from Michigan, and it did not appear again until 

 1929 at Alpena and 1930 at Petoskey (23). Apparently, it has been confined to 

 small areas in this State and, although threatening, it has not yet become a 

 serious pest. 



New Jersey. — - The carrot rust fly has been known to be present in New Jersey 

 since June 1920 when it was found in Passaic County. Infestations have been 

 recorded at intervals through the northern two-thirds of the State, but the 

 injury to carrots has been variable and generally slight. 



Pennsylvania. — Records of injury by the carrot rust fly in Pennsylvania start in 

 1921 when it was found in Adams County, with the majority of the infestations 

 occurring in 1927 and 1928. Altogether it has been found in twelve counties, 

 mostly in the northern part of the State. The infestations in Adams County 

 and Fulton County constitute the most southern known records for this insect 

 in the United States, being located at approximately 40° north latitude. 



Oregon. — In a list of Diplera found in Oregon, published in 1921 by Cole and 

 Lovett (5), Psila rosae is recorded from Corvallis with a note that it is sometimes 

 of economic importance. No other record of its occurrence in that State has been 

 found, and a survey in 1937 failed to find any evidence of this insect. 



Rhode Island. — The first record in Rhode Island refers to specimens collected 

 at Newport in December 1923. Since that time, occasional damage to carrots 

 in the vegetable-growing areas has been observed by County Agricultural Agents, 

 but apparently it never became so destructive as in Massachusetts. 



Connecticut. — Infested carrots and parsnips were observed in Winsted and 

 New Haven in 1927, and slight infestations were reported until 1931 (2). No 

 evidence of this insect has been recorded since and it is not considered an im- 

 portant pest in Connecticut. 



Ohio. — Reports by Houser and Parks in the winter of 1931 refer to infestations 

 in stored carrots grown at Canton and Akron during the previous summer and 



