140 REPORT OF OFFICE OF EXPERIMENT STATIONS. 



and for blight of jootatoes, made observations on the injury to apples 

 by lime-sulphur wash and Bordeaux mixture, experimented in top- 

 working apples, and tested varieties of potatoes, together with cul- 

 tural methods. Varieties of plums generally grown in Iowa were 

 studied, described, and classified ; experiments in the cold storage of 

 Iowa-gi*own apjoles were .conducted, and the results of observations 

 as to the storing quality of different varieties were reported. Ex- 

 tensive plantings have been made of orchard fruits, mainly apples, 

 but also pears, plums, and grai^es. 



The entomological work of the year embraced investigations on 

 the oyster-shell scale and the apple leaf-hopper, and experiments in 

 spraying for the codling moth. In the study of the apple-leaf 

 hopper, special attention was given to its life history, classification, 

 destructiveness, distribution, feeding habits and food plants, control 

 measures, and natural enemies. 



The station veterinarian completed and reported the results of 

 tests made during several years for the detection of tuberculosis in 

 cattle, and, in cooj^eration with the department of animal husbandry, 

 studied the influence of infected cattle on the hogs following them, 

 and the effect of feeding infected milk to swine. Observations were 

 also made and rejoorted on tuberculous cattle held in quarantine. 



The botanist of the station had charge of the enforcement of the 

 State pure-seed law, and in connection therewith made studies of the 

 weeds of the State, and the means of eradicating them. The results 

 of experiments on the eradication of weeds by means of chemicals 

 or herbicides were published, together with observations on the ger- 

 minability of seeds as affected by being kept in compost. Attention 

 w^as also given to experiments in cultural methods for destroying 

 quack grass. Work on fungus diseases of plants was also carried on, 

 and the results of observations on certain plant diseases prevalent in 

 1908 were published in bulletin form. 



The publications of the station received during the year were as 

 follows: Bulletins 104, Some Plant Diseases of 1908; 105, Notes on 

 Eradication of Weeds, with Experiments Made in 1907 and 1908; 

 IOC), Preparation of Corn for Hogs ; 107, Tuberculosis and its Detec- 

 tion; 108, Cold Storage for Iowa Apples; 109, The Value of Corn, 

 Oil Meal, Cottonseed Meal, and Gluten Feed in Work Horse Ra- 

 tions; 110, Roots and Cora Silage for Fattening Lambs; 111, The 

 Apple Leaf-hopper (with popular edition) ; 112, The Influence of 

 Feeding Sugar Beets and Mangels to Breeding Animals, with Special 

 Reference to the Fomiation of Renal and Urinary Calculi (with pop- 

 ular edition) ; 113, Influence of Condimental Stock Foods on the Di- 

 gestibility of a Corn Ration Fed to Swine (with popular edition) ; 

 and 114, Plum Varieties (with popular edition). 



