discovered that eggs passed successfully through last winter here, and 

 hatched in the spring. A number of other grain plant lice have also 

 been exhaustively studied. 



Work with the Cabbage Maggot has been continued during 1907 

 and 1908, our attention in the latter year being principally given to 

 treatment of radishes to prevent its attack. In the summer of 1907 

 one man devoted almost his entire time to the studying of means of 

 protecting cabbage and cauliflower plants from the attacks of this 

 pest. Results of this work, embodied in advice and suggestions, were 

 mailed to all market gardeners in April, 1908, as Circular No. 9 from 

 this office. "Remedies for the Cabbage Maggot." Several parasites 

 new to science have been reared from this pest. 



Plum Curculio: In 1^'07 and 1908 experiments were carried 

 on by Mr. Ruggles, an assistant in this department, to test the value of 

 spraying plum trees with arsenate of lead, and have proved conclu- 

 sively that a large per cent of fruit can be saved by spraying at the 

 proper time witli this comjiound. 



Comparisons of Liquid Spray and Dust Spray: During the 

 two years just past these two widely different agents have been tested 

 upon the Russian orchard at the Experiment Station, which orchard 

 was courteously placed at our disposal by the Horticultural Division. 

 This work was directed against the Apple Scab, the Plum Curculio 

 and the Codling Moth. The results .largely favor the liquid spray as 

 being more advantageously used than the dust spray. 



Hydrocyanic Acid Gas: Experiments with this dangerous but 

 effective medium, made by combining cyanide of potash with sulphuric 

 acid, have been continued, to get further data as to the time elapsing 

 between the dropping of the charge into the acid, and the giving off 

 of the gas ; also the distance into a mass of meal or bran to which 

 this gas can penetrate effectively. 



Office Publications: In addition to various communications to 

 the state press, from time to time as occasion demanded, the following 

 publications have been issued from this office during 1907 and 1908: 



1907 "Three New Hymenopterous Parasites of Pcgoniyia brassicae" 

 (technical). 



Nov., 1907 Press Bulletin 28, "1. The Fall Web Worm a Menace in 

 ^linnesota. 2. Autumn Remedies for the Stalk Borer in 

 Flower Gardens." 



Feb., 1908 Experiment Station Bulletin No. 105, "The Importance of the 

 Study of Entomology; How to Collect and Preserve In- 

 sects." 



Feb., 1908 Circular No. 6, "Crown Gall in Minnesota." 



Feb.. 1908 Circular No. 7, "^^lediterranean Flour Moth." 



