162 EXPERIMENT STATION RECORD. 



ExperiraenU v:lth hydrocyanic-acid gas as a means of exterminating 

 mealy hugs and other itisect pests in greenhouses, 11. D. Ilemenway 

 (pp. 69-7S). — The author condacted a number of experiments with 

 this gas in a wooden box and also greenhouse rooms. The cacti of the 

 greenhouse were infested with Diaspis cacti. The room contained 

 cacti, begonias, passifloras, bananas in fruit, etc. The meah^ ^nigs, 

 scales, and aphides w^ere destroyed as well as a large percentage of the 

 sow-bugs and earthworms. 



In a house which contained carnations, smilax, violets, chrysanthe- 

 mums, etc., and was infested with Dactylop>iw< destructor and Orthezia 

 insignis, 1 oz. of potassium eyanid was used to every 285 cubic 

 feet. The insects were killed, but some of the plants were badly 

 injured. The so-called "dilute method" of fumigation was tried in 

 a camellia room, 1 oz. of potassium eyanid being used to every 3,0UO 

 cubic feet. It was fumigated at 6 o'clock p. m. The room was 

 infested with green fly, mealy bug, and Fuller's rose beetle, and the 

 plants in the room included coleus, azaleas, heliotropes, ferns, orange 

 trees, etc. The insects were uninjured except part of the green flies. 

 Xo damage was done to the plants. A number of other experiments 

 were conducted, and the results are stated in tabular form. 



Sccde insects on Ameidcan fruit imported into Germany (pp. 79-83). — 

 An abstract of a paper b}^ L. Reh, previously abstracted (E, S. R., 

 11, p. 6.5.5). 



Insect control in Bive7\side, Cal.^ F. G. Havens (pp. 83-88). — The 

 orange-growing section of Riverside comprises 12,500 acres of citrus 

 orchards, and this region is one of the 3 divisions of Riverside County. 

 This division is subdivided into 6 districts, and a local inspector has 

 charge of each district. Each orchard is examined tree by tree, and 

 a permanent record is kept by means of cross-lined paper. Besides 

 inspection, the work of the insect-pest control includes eradication and 

 quarantine. Very efficient methods of eradication have been devised 

 and put into practice at Riverside. In 1898, 1,609 trees on 315 acres 

 were infested with red scale. In 1899 the same orchards contained only 

 433 infested trees. The quarantine work has been so efficient that no 

 insect pests have been introduced and become established since the 

 existence of the horticultural commission. 



Xotes on a Irief trip to Porto Rico in January and Fehrimry of 

 1899, A. Busck (pp. 88-93).-— A brief account of a trip to Porto Rico 

 for the purpose of investigating the insect conditions of that colony. 

 Notes are given on insects injurious to sugar cane, coflee, and tobacco. 

 Gryllotcdpa hexadactyla is report(>d as being exceedingly injurious to 

 young tobacco plants. Large colonies of bees were frequentl}' met 

 with in hollow trees, and a considerable honey product is obtained 

 from them. The article contains a list of the Coccid» collected by 

 the author and identified by T. Pergande and T. D. A. Cockerell. 



