THE TOBACCO THRIPS, A NEW AND DESTRUCTIVE ENEMY OK 

 SHADE-GROWN TOBACCO/' 



{I'jUt III ills iiirdtiiiini Iliuds.) 



INTRODUCTION. 



In accordance with the authorization of the Secrotar}^ of Agricul- 

 ture and the instructions of Dr. L. O. HoAvard, the writer left Wash- 

 ington, D. C, April 14, 1905, to investigate certain injury to shade 

 tobacco at Quinc}^ Fla. He arrived at Quinc}^ April 10 and spent 

 the following two months in the work. Having reached Avhat seemed 

 to be a satisfactory result, he left there on June 1(). June 27 was 

 spent at Palestine, Tex,, and June 28 and 29 at Nacogdoches, Tex., in 

 examination of tobacco fields. At Quincy the writer was associated 

 with Mr. W. W. Cobe}^, tobacco-breeding expert of the Bureau of 

 Plant Industry, from whom valuable advice and suggestions were 

 received. The writer again visited Quincy in October, 1905, and spent 

 two weeks in a further examination. A continuation of the Avork was 

 planned for 1906, but could not be carried out, although a visit Avas 

 made at Quincy in November to determine the results obtained 

 Avhere remedial measures had beeu emj^loyed. 



HISTORY. 



The iirst report of thrips injuring tobacco in this country, so far as 

 the Avriter is aware, was made by Dr. ¥. II. Chittenden in 1904,'' the 

 species concerned being considered as Iiutluips tritic'i Fitch. As will 

 l)e seen from the folloAving pages, additional material showed that 

 the in.sect concerned is a ncAv species, Euthripx tih-othnui' Hinds. 



A Russian, Lindeman,'' first described scientifically in ISSS a 

 species of thi'ips, TJuipK tahdci. which he reported as doing great 

 damage to tobacco in that country. While (his same species is gen- 

 erally disti'ibuted in our own country and although its list of food 

 plants is large, it is not lecorded as having attacked tobacco hei'e. 



Several communications Avere received by this Bureau diirinir the 



n Circular No. C8, pnl>lisii('(l F(>liru;iry. i;»(ic.. L'ivcs ;i ln-icf accdniit of llie 

 insect and remedies roconnnended \\y tiic u liter. 



6 Yearbook of the V. S. I)ei)artnient of ALrriculture for r.»(l4. p. C.U.".. l!i(i.".. 



p Die Sehiidlichsten Insekten des Taltal< in I'.essarabien, Bull. Soc Iniii. 

 Xatur., Mo-scow. i)p. 51-05. 1888. Roc also 'i'ar.L'ioni-To/zetti. Aniiii:ili cd 

 insetti del Tabacco. i)p. 222-L»L'4, IS'H. 



