1919] ECOl^OMIC ZOOLOGY — ENTOMOLOGY. 355 



Linseed oil-Bordeaux, E. W. Berger (Proc. Fla. State Hort. Soc, 30 (1917), 

 pp. Jflf-Jfl). — In search for a mixture which would serve effectivelj' as a fungi- 

 cide and insecticide, 3 per cent raw linseed oil was mixed with strong Bordeaux 

 (double strength and stronger) by stirring the oil into the Bordeaux. While 

 the effect of this mixture on San Jose scale, purple scale, and citrus white fly 

 on which it was tested has not been definitely determined, the linseed oil was 

 found to have great value as a sticker for the Bordeaux, its presence being 

 visible for five or six months. The efficiency did not appear to be diminished 

 by the addition of the oil. 



" White ants " as pests in the United States and methods of preventing 

 their damage, T, E. Snyder (U. S. Dept. Agr., Farmers' Bui. 1037 {1919), pp. 

 16, fifts. 11). — A popular summary of information. 



Entomology, A. W. Morrill {Arizona Sta. Rpt. 1911, pp. Ift2, ^73). — This 

 report relates entirely to control work with the differential grasshopper 

 {Melanoplus cliffercntiaUs), the most destructive species in Arizona, a more 

 extended account of which by the author has previously been noted (E. S. R., 

 39, p. 359). 



The black fly, W. Newell {Proc. Fla. State Hort. Soc. 31 {1918), pp. 90- 

 96). — A discussion of the status of Aleurocanthus tooglumi, particularly as re- 

 lated to Florida. See also a previous note (E. S. R., 39, p. 864). 



The green soldier bug or pumpkin bug in citrus groves, J. R. Watsoin 

 {Proc. Fla. State Hort. Soc., 30 {1917), pp. 3-^-36).— The author reports upon the 

 results of a test to determine the actual cost of collecting the green soldier 

 bug {Nezara viridnla), made on a 200-ncre grove, and to try out on a large 

 scale several different types of nets. The trees in the orchard were 10-year-old 

 trees, set 20 by 30 ft., and averaged fi'om 30 to 100 bugs per tree, 97 per 

 cent of which were N. viridula. 



It was found that the nets should be at least 3 ft. in diameter and of 

 equal depth, having a short handle which extends across the diameter of the 

 net to stiffen the rim, which is of telephone wire. One man can manipulate 

 the net. although two work to better advantage, one holding the net under a 

 limb full of fruit and the other giving the limb a vigorous shake, causing 

 the bugs to drop and roll to the bottom of the net. After finishing each 

 tree the tip of the net with the contained bugs is dipped into a bucket 

 of kerosene, which keeps the net constantly wet with the oil. 



It is stated that in the experimental grove it cost between 30 and 75 cts. 

 per acre to collect the bugs. Two men working together cover an acre in 

 from one to two and one-half hours, depending on the amount of fruit and 

 the number of bugs present. The author considers this the most satisfactory 

 method of dealing with the green soldier bug thus far devised. Larger nets 

 can be used early in the morning, on moonlight nights, and on cold days. 



The grain bug, D. J. Caffrey and G. W. Barber {U. S. Dept. Agr. Bui. 779 

 {1919), pp. 35, figs. 13). — This report is based upon observations by the senior 

 author in 1915 and the junior author in 1916 during a destructive outbreak 

 of Chlorochroa {Pentatoma) sayi in northeastern Nevi^ Mexico and adjacent 

 territory. 



Since 1911 it has become a serious enemy of wheat and other small grains 

 in the intermountain and southwestern States. " The most important damage 

 Is caused by the insect piercing the newly-formed heads of various cereals 

 and removing the liquid contents, thus preventing the formation of the 

 grain or greatly reducing its weight. The reduction in yield from grain-bug 

 attack varies from 10 to 50 per cent of the crop. In extreme cases the 

 entire crop may be destroyed. 



