577 



A table records the effect of various insecticides on T. pallidas. 

 Bordeaux mixture may be safely used on geranium foliage to kill the 

 mites. Sulphur and other solutions were tried and discarded owing to 

 injury to the foliage. Chromic and picric acids produced discoloration 

 of the leaves, but a thorough watering of the plants on the day following 

 this treatment might recTuce the injury to a negligible amount. A 

 stream of pure water ^^^ll dislodge many of the mites, and this is a 

 feasible method with geraniums, since the leaves do not curl so badly as 

 to hide the mites as in the case of snapdragon. 



Allard (H. a.). Further Studies of the Mosaic Disease of Tobacco. — 



Jl. Agric. Research, Washington, B.C., x, no. 12, 17th September 

 1917, pp. 615-631, 1 plate. 



It was observed during the winter and spring of 1912 that Aphids 

 were in some manner associated with outbreaks of the mosaic disease 

 of tobacco [see this Revieiv, Ser. A, i, p. 19]. Experiments have since 

 shown that some Aphids may become active carriers of the infective 

 principle of the disease, though all species do not appear to transmit 

 it with the same readiness. The green peach aphis, Mgzus persicae, 

 Sulz., is an active carrier in the greenhouse, where it is found on a 

 variety of plants. Under field conditions Alacrosiphiim tabaci, Perg., 

 appears to be an efficient carrier of the disease, and there is strong 

 reason for suspecting that the widespread epidemic of mosaic disease 

 that affected tobacco, tomatoes, and datura during 1913 was due 

 to the presence of this Aphid, colonies of which were found on the 

 under-sides of the ground leaves of almost every tobacco plant in the 

 field. Tetranychus telarius, L. (red spider) and Aleurodes vaporariorum, 

 Westw. (whitefly) have given negative results wdth regard to trans- 

 mission of this disease. It is found that if Aphids are excluded from the 

 greenhouse by fumigation, the occurrence and spread of the mosaic 

 disease of tobacco becomes a negligible factor, while it cannot be 

 controlled so long as Myzus persicae is allowed to multiply 

 unchecked. 



McHargue (J. S.). A Study of the Proteins of Certain Insects with 

 Reference to their Value as Food for Poultry. — Jl. Agric. Research, 

 Washington, B.C., x, no. 12, 17th September 1917, pp. 633-637. 



This paper shows by comparative analyses that Melanoplus spp. 

 (grasshoppers) and Lachnosterna sp. (June bugs) contain proteins 

 similar both in character and quantity to those contained in the higher 

 animals that furnish a large part of human food. The results of j^rotein 

 determinations on these two insects are given in a table and are 

 contrasted with the protein content of roast beef and turkey under the 

 same method of analysis, the results showing considerable similarity. 

 Experiments show that grasshojDpers deprived of their moisture 

 contain a higher protein content than commercial meat meal and in all 

 probability could be made an efficient substitute for it. It is pointed 

 out that the instinct in wild and domesticated birds which guides 

 them in their natural selection of the most efficient food is confirm3d 

 by the high lysin content found in the insects thus far examined. 



