854 EXPERIMENT STATION KECORD. [Vol. 36 



Moth, by S. A. Forbes and P. A. Glenn (pp. 1-21), are by the author and have 

 been previously noted, namely, A General Survey of the Maybeetles (Phyllo- 

 phaga) of Illinois (pp. 23-65) (E. S. R., 35, p. 158) ; The Influence of Trees 

 and Crops on Injury by White Grubs (pp. 66-70) (E. S. R., 35, p. 159) ; and 

 The Chinch Bug Outbreak of 1910 to 1915 (pp. 71-127) (E. S. R., 36, p. 153). 



The paper relating to the codling moth gives the main practical results of 

 work in 1915 in addition to the information given in the paper previously 

 noted (E. S. R., 34, p. 251). The data obtained concerning both insects and 

 weather have been brought together in two diagrams. There were found to be 

 two complete generations of the codling moth in both central and southern 

 Illinois during 1915, and a small or partial third generation at Olney and 

 farther south. 



It is found that the temperature of the season has very much to do with the 

 rate at which the successive changes go on, the time at which the different 

 generations make their appearance, reach their largest numbers and dis- 

 appear, and with the size and importance of the last or third generation of the 

 year. It is pointed out that 1914, when a total failure to control the pest re- 

 sulted in some orchards notwithstanding the fact that sprays had been applied 

 six, and in some cases seven times, was a very different year from 1915 through- 

 out southern Illinois, not only in respect to temperature and other weather con- 

 ditions but also in the number and importance of the last generation of the 

 codling moth. 



The authors are convinced that the successful timing of spraying operations 

 to the life history of the insect so that effective poisons may be on the apples 

 when they are most needed and will be most destructive to the young apple 

 worms requires a careful and intelligent observation of the course of events 

 for each year. They believe that for the best results a well-equipped observa- 

 tion station with an experienced man in charge is necessary for each of the 

 principal fruit sections of the State, but propose a practical method by which 

 the fruit grower can himself follow the course of events through the season 

 in a way to serve fairly well the necessities of the case, enabling him to learn 

 for himself and for the fruit growers in his region about when spraying should 

 be done and how often repeated to protect his crop. 



Entomological report for 1915, E. N. Cory (Rpt. Md. State Hort. Soc, 18 

 {1915), pp. 151-163). — This reports briefly upon the occurrence of the more 

 important insects in Maryland during 1915. 



Report of the department of entomology, T. J. Headlee (New Jersey Stas. 

 Rpt. 1915, pp. 297-385). — The several parts of this report include a tabular 

 statement of the insects and other animals about which correspondents have 

 written ; the occurrence of the more important insects of the year, including 

 the tent caterpillar, apple and other plant lice, pear psylla, white grub, the rose- 

 chafer, flea-beetles, army worm, Angoumois grain moth, the European pine shoot 

 moth (Evetria huoliana), the European mole cricket {Gryllotalpa gryllotalpa), 

 etc. ; and investigations. 



Control work was carried on with the mushroom spring-tail (Achoreutes 

 armatum), which was a source of injury at Irvington. Carbon bisulphid was 

 found to destroy the spring-tails, but its use resulted in such serious injury 

 to the mushrooms that It can not be considered as a remedy. In control work 

 with white grubs it appears that the minimum dose of carbon bisulphid on red 

 Bhale soil is not far from 0.75 oz. to the square foot. Even when used much 

 stronger up to November 1 there was no trace of injury to either blue grass or 

 clover on any of the plats, indicating that the minimum dosage for the grub is 

 well below the maximum dosage for blue grass and white clover. In the control 

 of the rose-chafer on apple self-boiled lime-sulphur plus lead arsenate was the 



