ENTOMOLOGY. 265 



insects injurious to various cultivated crops and the dates of their appearance as 

 reported to the station for a series of years. 



Insects injurious to beets {Landtmannen, 11 {1900), No. 46, j)p. 571-574.) — An 

 account is given of the haliits and life history of Cassida nebulosa, which is reported 

 as being very injurious to l>eets. Its natural food plants are said to be species of 

 Chenopodium and Atriplex. Spraying with Paris green proved very effective in the 

 destruction of the jtest. 



Mites injurious to field crops, A. Bekf.ese {Rir. Ptttnl. Vi'(j., S {1900), No. 7-12, 

 pp. 227-291, fujx. 61). — This paper contains descriptions, biological and economic 

 notes on a large number of genera, including Pediculoides, Bryol)ia, Tetranychus, 

 Tarsonenius, etc. A bibliography is given of literature relating to the subject. 



The destructive green-pea louse, F. 11. Chittenden {U. S. Dept. Agr., Divinon 

 of Entomolorjy Circ. 43, 2. ser.,pp. 8, figs. 3). — A brief description is given of the insect 

 in its different stages, together with an account of the extent of injury to peas and 

 otherplant,« upon which itdepredates. Mentionismadeof a number of natural enemies 

 of this in.sect, including the lady beetles, lace-wing flies, red mites, syrphus flies, and a 

 parasitic fungus Empasa (ipJiidis. Among the artificial remedies which are recom- 

 mended for conti'oUing this insect, mention should be made of the use of kerosene- 

 soap emulsion, the brush and cultivator method, the brush and pan method, and 

 rotation of cro})S. 



Experiments with, lime mixtures for the eradication of scale insects, ^\^ T. 

 Macoun ( Canada Expt. Faniis Rpts. 1900, pp. 119-123) . — Experiments in whitewash- 

 ing trees to retard the swelling of buds in the spring showed that this treatment was 

 effective in destroying the oyster-shell bark-louse. The formula used was lime 

 60 lbs., water 24 gal., skim milk 6 gal. This produced a thick mixture which 

 was difficult to spray. The trees were sprayed 6 times, and since this was considered 

 too expensive for treatment against scale insects, experiments were tried to determine 

 how many applications were necessary for this purpose. In these experiments 2 

 lbs. of lime were used to the gallon of water, and the trees were sprayed on 

 November 17, 20, 27, and December 7. The mixture did not adhere as well as when 

 skim milk was used, and began to peel off after a period of 10 days. The results 

 indicated, however, that 2 sprayings were quite sufficient to give satisfactory results 

 in destroying the oyster-shell bark-louse. 



Further experiments were made to determine the minimum strength of lime neces- 

 sary to obtain satisfactory results. These experiments, while not leading to definite 

 conclusions in all respects, indicated that the best time to spray for this purjjose is 

 in autumn rather than winter uv spring. An apple tree was sprayed twice with 

 a solution containing 2 lbs. of lime, 1 gal. of water, 1 quart skim milk, 5 oz. of 

 salt. The .second spraying was done when the leaf buds were opening. No injury 

 resulted to the tree. Experiments with lime mixtures on peach trees infested with 

 the San Jose scale, and on plum trees infested with the New York scale, indicated 

 that these scales were not destroyed by this method. 



Experiments in Italy in destroying- the scale lice of cultivated plants, 

 G. Del GrERCio {Nuuvc Rdaz. R. SUiz. Eiit. Agr., 1. xer., 1900, No. 3, pp. 417-42").— 

 The experiments reported in this article were carried out with the assistance of Prof. 

 I']. Banjni. These experiments showed that a single treatment with a soap emulsion 

 oi oil of tar containing 1 per cent of tar was (juite etficient against young scale lice 

 just hatched, but did not completely rid the plants of infestation. A 2 or 8 per cent 

 solution of the same mixture was very effective and jjlants thus treated seemed to 

 make a vigorous growth. 



The San Jose scale, J. Ritzema-Bos {Tijdschr. Plantenziekten, 6 {1900), No. 5-6, 

 pp. 152-159).— The author discusses the dangers from importing San Jose scale on 

 nursery stock and fruit, and concludes that there is little likelihood that San Jos^ 

 scale which are imported on fruit will escape into orchards. 



