680 EXPERIMENT STATION RECORD. 



Where there is less rain a f per cent solution is believed to be sufficient in the ordi- 

 nary season, and in dry years or in regions where frequent rains are not experienced 

 a 5 per cent solution will be found sufficient for combating the downy mildew. 



Journal of Mycology, index, W. A. Kellerman (Jour. Mycol., 10 (1904), Am. 

 74, pp. 289-392). — This is an index to the first 10 volumes of the Journal of Mycology, 

 in which the hosts and parasites are indexed and a considerable list of synonyms are 

 given. In addition a separate index is given to Volume X. 



Horticulture: Diseases and pests, F. 1*. Felt (New York State Library Legis- 

 lation Bui. 22°, pp. 15, 16). — A review is given of recent legislation regarding the 

 diseases and pests of horticultural crops. A number of States have amended their 

 laws to secure greater efficiency, and among them California, Utah, New Mexico, 

 and Florida. Notes are given of changes in legislation regarding the insect pests in 

 Texas, .Minnesota, ami California. Nursery inspection laws have been enacted by a 

 number of States and others have amended previous laws to secure greater efficiency, 

 the principal changes being made in California, Connecticut, West Virginia, Michigan, 

 Montana, New Jersey, and Virginia. 



ENTOMOLOGY. 



The use of Paris green in controlling the cotton-boll ■weevil, W. D. IItxter 

 ( U. S. Dept. Agr., Farmers' 11"/. ..'11, pp. 23). — During the past season the Bureau of 

 Entomology has carried on a number of experiments with Paris green as a spray and 

 in a powdered form and similar experiments have been made on a large scale by 

 planters in various parts of Texas. It is estimated that at least 25 carloads of Paris 

 green were used in Texas in combating the boll weevil. 



The experiments reported by the author were largely confined to testing the value 

 of Paris green when applied in the form of a dry powder. Careful estimates were 

 made of the number of weevils present on treated plants and the effect of the appli- 

 cation of Paris green was studied as accurately as possible. As the result of tests on 

 a small scale, during which 732 weevils were counted on the plants which were 

 treated, 27.12 per cent of the weevils were found alive after treatment, 32.05 per cent 

 dead, and 40.89 per cent missing. The lightest application during these tests was at 

 the rate of 20 lbs. per acre and it was estimated that 4 applications at this rate could 

 not possibly be profitable. 



Three tests were made on a large scale by the author and other experiments were 

 conducted by various planters located in different parts of Texas. As a result of all 

 of these tests of the value of Paris green, it was shown that about 30 per cent of the 

 weevils may he killed by heavy application of the poison when the plants are small 

 and without squares. Many instances were noted, however, where a striking failure 

 from the use of Paris green was evident, while the efficiency of cultural methods 

 was demonstrated. 



The author concludes from his experiments, therefore, that the persistent use of 

 Paris green, in some cases as many as 15 applications, does not materially reduce the 

 number of weevils or increase the yield of cotton. Conclusive instances of the 

 successful use of Paris green by planters were not observed. The reasons for the 

 ineffectiveness of Paris green are to be found in the facts that a large percentage of 

 the weevils do not emerge until after the formation of squares on the cotton plants 

 and that, therefore, the weevils feed within the shelter of the bracts. 



Cotton insects and fungus blights, C. Poller (Natal Agr. Jour, ami Min. lire, 

 7 (1904), No. lo, j,p. 931-944, fi'js. 16). — The author discussed the habits, life history, 

 natural enemies, and means of com) fating cotton-boll worm, cotton worm, Mexican 

 cotton-boll weevil, cutworms, plant lice, Atavia crypta, etc., as well as rust mildew, 

 angular spot, pink spot, and cotton-boll rot. 



