256 EXPEKIMENT STATION RECORD. [Vol. 41 



"An attempt to lind a washing formula which oi itself would be effective 

 witliout depending on the high temperature of the drying tumbler was not su-,> 

 cessful, although results of one experiment with benzol, 30.5° B. indicated that 

 the oil could be used for this purpose, if infested garments were soaked 2 to 4 

 liours before washing. A preliminary soal^ing in kerosene or in a 52° kerosene- 

 gasoline mixture followed by washing in gasoline was found in laboratory 

 tests to be inelfective. 



"Laboratory tests with a series of oils showed that benzol (30.5°) killed 

 after 2 to 4 hours' inmiersion ; kerosene (44°) killed within 10 minutes; gaso- 

 line-kerosene mixtures (48 and 52°) killed after 15 minutes; a 56° nuxture did 

 not kill within 17 hours. Gasoline did not kill all eggs after 54 hours' immer- 

 sion. When immersion in any of the heavier oils was followed by a rinse 

 in gasoline hatching occurred. Gasoline-soap emulsion was found to have little 

 killing eiTect on eggs even after 30 minutes' innnersion." 



Notes on Diacrisia virginica, J. D. Mitchell {Ent. News, 30 (1919), No. 7, 

 pp. 191-19-',). — The autlior reports ol)servations made of the yellow bear cater- 

 pillar in Calhoun and Victoria Counties, Tex. In the sunnner of 1917, it was 

 found feeding over all of Victoria County on various species of plants and 

 shrubs, of which 36 are listed, and on cultivated plants, including cotton, corn, 

 cantaloup, alfalfa, peanuts, and all garden crops. 



The damage which it caused to cotton in the two counties in 1918 through 

 stripping of the leaves is claimed by farmers to be from 25 per cent to total 

 destruction, and in one field of 65 acres in Calhoun County visited by the author 

 the destruction was complete. 



In rearings by the author a large percentage of tlie caterpillars were de- 

 stroyed by a fungus caused by Entomophthora anticw. Eremotylus arctiw was 

 the only parasite reared. When very young the caterpillars can be killed by 

 the application of 3 lbs. of Paris green and 5 lbs. of lime made into 50 gal. of 

 spray, but when the caterpillars have reached a large size no poison or repel- 

 lents seem to have any effect on them. 



The work in the United States against the pink bollworm, W. D. Hunter 

 (.Jour. Econ. Ent., 12 (1919), No. 2, pp. 166-175). — A detailed account of the 

 work by the U. S. Department of Agriculture, a bulletin relating to which by 

 the author has previously been noted (E. S. R., 39, p. 764). 



The European corn borer and its control, S. C, Vinal and D. J. Caffrey 

 (Ma.-i.sdchu.seUs .S'^a. Bui. 1S9 (1919), pp. 71, fifis. i.'/).— This is a detailed report 

 based upon investigations conducted by the authors and a review of the htera- 

 ture, including data presented in the preliminary account by Vinal previously 

 noted (E. S.' K., 39, p. 62). The investigations reported in the present bulletin 

 were conducted by the station in cooperation with the Bureau of Entomology 

 of the U. S. Department of Agriculture. 



Up to November, 1918, the European corn borer had become established in 

 an area of about 320 square miles, comprising 34 towns, immediately west, 

 north, and northwest of the city of Boston. A colony had also been found 

 near Schenectady, N. Y., as noted by Felt (E. S. R., 41, p. 60). A list is 

 given of 33 plants attacked of which corn is its favorite host, all parts except 

 the tibrous roots being attacked. 



"The economic injury to corn consists of the following: (1) Injury to tassel 

 wdiich results in poor ferti'ization, (2) injury to stalk which reduces vitality 

 of plant, (3) injury to stalk which causes breaking over of plant, (4) injury 

 to stalk which indirectly affects the ear by cutting off its supply of nutriment, 

 (5) injury to ear which directly affects the yield, (6) injury to the silk of 

 the ear which results in poor fertilization. 



