ENTOMOLOGY. 709 



places, before it attacks the bud iu the spring. The proper remedy 

 therefore, wonkl be to poison the bark aud the outside of the branches 

 duriug" the winter or toward spring, thus killing the insect before it 

 does its chief injury bj^ attacking the buds." 



Dendrolene, J. B. S.AiiTn {Garden and Forest, 10 {1807), Xo. 463, 

 pp. S, 9).— In the spring of 1896 it was found that the Dendrolene pre- 

 viously applied to some peach trees had penetrated the bark suffi- 

 ciently to kill the cells and consequently^ to stop the circulation of the 

 sap. In some instances the effect was like that of a tight band around 

 the trunk. Young trees were most affected. It is suggested that 

 (1) some ingredient be mixed with Dendrolene to lessen its penetrating 

 power; (2) it should not be applied to young trees without consider- 

 able caution, and (3) in no case should the application be a perma- 

 nent one. 



Tests of insecticides, B. S. Goff ( Wisconsin Sta. Ept. 1895, pp. 

 307— 110). — Experiments were made with 4 insecticides submitted to 

 the station: (1) Oriental Fertilizer and Insect Destroyer, (2) Antiuon- 

 nin, (3) West's Chloronaphtholeum, and (4) Siebner's Potato Bug- 

 Exterminator Compound, with the result that none of them can be 

 said to have any special value. In the case of the first three, only the 

 Antinonnin can be depended upon as a remedy against either suck- 

 ing or leaf-eating insects, and this injures the plants to such an extent 

 that it is worthless for general use. In each case the directions given 

 iu the circulars were followed, but the compounds proved worthless 

 when so used. Their strength was doubled, but without materially 

 changing the results. In the case of the fourth compound, careful 

 comparison with control experiments proves it to be worthless so far 

 as preventing the attack of the beetle is concerned. 



On a bacterial disease of the squash bug (Anasa tristis), B. M. 

 DugCtAR {IJUnois State Lab. Xat. Hist., i {l,s90), pp. 310-379, 2>ls. :i).— 

 The subject of this bulletin was presented before section "G" of the 

 American Association for the Advancement of Science.' The disease 

 was observed during July, 1895, while studying some fungus dis- 

 eases of the chinch bug, a great many squash bugs being employed as 

 more convenient on account of size. Squash bugs kept in breeding 

 cages in the laboratory were observed to be dying in considerable num- 

 bers. A fresh lot taken from the field July 23 was put into breeding 

 cages, fragments of the dead bugs from the first outbreak being scat- 

 tered in one cage and the others kept under normal conditions. Within 

 3.i days one-half of the bugs in the infested cage were dead, while iu 

 the control experinient with many more individuals only two or three 

 died. A few hours previous to death the insect becomes sluggish 

 and often incapable of crawling without a marked drag. Finally a 

 slight movement of the antenmc and legs is the only sign of life. As 

 death approaches, the insect becomes slightly darker in color. After 



' .Science, i (1896), Xo. 91, p. 132 (E. S. K., 8, p. 212). 



