53 



almost identical control resulted with four bi-weekly sprays. Ap- 

 plication of the first four weekly sprays gave 81 to 90 per cent, 

 reduction, while the last four sprays showed 96 to 97 per cent. 

 Eight weekly sprays with the derris reduced (.0101 per cent. 

 rotenone) gave control equal to the standard (.0202 per cent.) 

 while 40 per cent, nicotine sul])hate (1-800) showed thrips reduc- 

 tion of 94 per cent. Effective control has been demonstrated w^ith 

 derris and nicotine sulphate under large-scale applications. Com- 

 plete eradication has not been effected with any of the treatments 

 tested. 



Faniiiiujdalc Iris Garden 



This garden, established in cooperation with tlie State Institute 

 of Applied Agriculture on Long Island, showed excellent results 

 during the past year. Of special interest were the Japanese iris. 

 A very large number of varieties of this group have been planted, 

 and made an excellent dis])lay. Many additional plantings were 

 made in the Propagation Section, ])articularly with a proposed 

 exhibit of the Japanese iris at the Worlds Fair in view. 



Iris Ilyhridij^ation 



In recent years a large number of hybrids between various so- 

 called " species " of Southern iris have been made. Of particular 

 interest are the crosses involving the very tall, blue flowered Iris 

 giganticaeridea and the unique colored /. fulva. Several first 

 generation ])lants involving these two species bloomed this year 

 and provifled material for self-pollination, as well as additional 

 combinations. The special interest in these hybrids will appear 

 when the second generation plants come into bloom. Miss Char- 

 lotte Beier, a graduate of Brooklyn College, volunteered her serv- 

 ices from February to September. She looked after the iris pol- 

 lination work in the greenhouse as well as in the field. The seeds 

 which resulted wei-e cared for and planted and we now have a large 

 number of interesting seedlings coming along for further studv. 



Graduate Students Enrolled During 1938 



Mr. Paul V. Brandwein. a graduate student of New York 

 University, has continued his studies. An interesting paper on 



