ECONOMIC ZOOLOGY ENTOMOLOGY. 549 



The use of lime and sulphur solution on citrus trees, W. W. Yotheks {Fla. 

 Groiver, 10 (1914), No. 16, pp. 10, 11). — The author presents a brief report of 

 results obtained from the application of lime-sulphur in the control of mites 

 on citrus in Florida. 



Applications of lime-sulphur for the control of the rust mite on July 18, 

 when there were many eggs and adults present, indicate that it is unneces- 

 sary to use dilutions stronger than 1 : 75 since this kills all adults and eggs. 

 Dilutions of 1 : 75 are said to kill also eggs and adults of both the 6-spotted 

 mite (Tetranychus scrinncnilatus) and the purple mite (T. mytiJaspidis) . 



While lime-sulphur was not so effective as oil sprays in killing the purple 

 scale, experiments show it to be suitable for this purpose. Fruit sprayed three 

 times with a dilution of 1 : 25 had only about one-fourth as many scales per 

 orange as were found on unsprayed fruit. It is stated that the white flies are 

 not affected by lime-sulphur, in several experiments dilutions of 1 : 9 having 

 no appreciable effect upon the pupa. The author mentions having observed 

 that lime-sulphur has some stimulating effect upon the growth of the foliage. 

 Attention is called to the fact that it should not be used on ripe fruit at 

 dilutions stronger than 1 : 40 or 1 : 45. 



The use of carbon bisulphid in emulsion at Martinique and Guadeloupe, 

 G. BoRDAz (Abs. in Agr. News [Barbados], 13 (1914), No. 317, pp. 202, 203).— 

 Applications of carbon bisulphid in kerosene emulsion have been found of 

 value in destroying white grubs, eelworms, and a root disease, probably a 

 Rosellinia disease. The most efficacious method in cacao and coffee planta- 

 tions is to pour the emulsion around the foot of each tree. 



The locust pest, C. R. Jones and D. B. Mackie {Philippine Agr. Rev. 

 [English Ed.], 6 (1913), No. 9, pp. 8, pis. 2; Philippine Bur. Agr. Circ. 23 (1913), 

 pp. 8, pis. 2). — These data have been substantially noted from another source 

 (E. S. R.. 28. p. 753). 



Thrips as pollinators of beet flowers, H. B. Shaw {U. 8. Dept. Agr. Bui. 

 104 {1914), pp. 12, pis. 3, figs. 5). — During the course of studies of the role of 

 thrips in the pollination of sugar beets several siiecies were collected from 

 beet flowers at Garland, Utah, including HeUothrips fasciatus, Frankliniella 

 fusca, and F. tritici. It is stated that Thrips tahaei was the species most 

 abundant in Ogden, Utah, during the seasons of 1911 and 1912. 



The investigations show that thrips are active agents in pollination, being 

 very numerous among beet flowers and effecting both close pollination and 

 cross-pollination. After taking into account the various forms of injury which 

 they cause, however, the author considers it doubtful whether the balance 

 remains in their favor in regard even to beets. " Under ordinary conditions, 

 in fields of commercial seed beets, it is believed that on the whole their work 

 is beneficial ; but should they become excessively numerous, they sustain their 

 reputation as one of our really destructive pests. To the horticulturist and 

 plant breeder they are pests of the worst type, necessitating constant watch- 

 fulness and a refined technique in all pollination work. 



" The suggestion is ventured that certain supposed mutations may really 

 have been the result of unsuspected cross-pollination by means of one or 

 another species of thrips, whether in cereals supposedly not susceptible to 

 cross-pollination without the intervention of man or in flowers which were 

 thought to have been isolated against cross-pollination." 



New genera and species of Thysanoptera, with notes on distribution and 

 food plants, A. C. Morgan {Proc. U. 8. Nat. Mas., 46 {1914), PP- 1-55, figs. 

 79). — Three genera and 19 species are described as new to science, among 

 which are Euthrips floridensis, taken on Asclepias variegata and in blossoms of 

 Catalpa catalpa, at Quincy, Fla. ; E. hawaiiensis from cotton at Honolulu ; 



