358 EXPERIMENT STATION llECORD. LVol.43l 



the sprays wliich come at the time the hirv;e of the tirst and second hroods are 

 eiiteriiif^ tlie apph^s are not only of much greater importance tlian lias hitlierto ; 

 heen attril)uted to tliem, but are absolutely necessary to satisfactory control,' 

 when the codling moth is present in as great abundance as is now the case of 

 New Jersey and probably Delaware; that that portion of the A,tlantic Coastal 

 I'lain comprised in the southern half of New Jersey and probably Delaware 

 v.-iries sntliciently so to modify the habits of econonuc species of insect -com- 

 ing within its range as to render the studies made of them elsewhere in the 

 country only partially applicable to coastal plain conditions ; and that studies of 

 countrywide economic species should be cari'ied out on a regional basis under a 

 plan which comprehends cooperation between State and between State and 

 Government agencies. 



[Codling moth investigations] (New Mexico Hta. Rpt. Id 19, pp. ;J/-.J.3). — 

 A brief statement is made of the life history work. A summary of experimental 

 spraying on apples, winter pears, and Bartlett pears is reported in tabular form. 



A Connecticut corn field injured by Craiubus ijrtcfectellus Zinck, W. E. 

 Britton {.Jour. Econ. Ent., 13 {W20), No. 2, pp. 222, 223),— This is a brief ac- 

 count of the injury caused by C. prccfectellus to a small field of corn a few miles 

 from the center of New Haven. When only a few inches high, the plants began 

 to look sickly and the outer leaves turned yellow, then shrivelled and died. The 

 new leaves kept green for a time but the plant soon died. The injury was caused 

 just at the surface of the ground where a cavity or hole had been eaten into one 

 side of the stem, often to its center, there apparently being only one larva to 

 each stalk. It is thought to be the first instance of serious injury having been 

 caused by this insect. 



An account of this injury by the author has been noted from another source 

 (E. S. R., 43, p. 251). 



A study of the oviposition of the corn earworm with relation to certain 

 phases of the life economy and measures of control, J. W. McColloch 

 {Jour. Econ. Ent., 13 {1020), No. 2, pp. 21,2-255, flg. i).— This report is based 

 upon studies in Kansas on different varieties of corn plants with relation to the 

 date of planting and period of silking, made during the past six years. The 

 work represents the daily number of eggs deposited on 128 individual plants 

 and the silking period of 128 rows of corn. 



" Three distinct broods of the corn earworm occur each year, the first brood of 

 moths emerging early in June, the second brood about July 10, and the third 

 brood about August 10. The maximum emergence occurs about two weeks aftdt 

 the first emergence. The first two broods are of little importance in comparison 

 with the third brood. 



"The date of silking is dependent on the variety rather than on the date of 

 planting. While the plantings were made at intervals of two weeks, the dates 

 of silking show a difference of less than a week for corn planted April 15, May 

 1, and INlay 15. The moths show a decided preference for the silks for oviposi- 

 tion. When these are not available, the upper surface of the leaves and the 

 stalks are selected. Relatively few eggs are deposited on the lower surface of 

 the leaves, the husk, or the tassel. 



" There is a distinct relation between the date of planting and the number and 

 location of the eggs. From the data presented, April 15 is too early to plant 

 corn from the standpoint of oviposition, and .Tune 1 is too late. The variet.v of 

 ccfrn, however, is to be considered in developing the optiinum date to plant coi'n, 

 since each variety exhibits certain variations which will have an influence on 

 the number of eggs deposited on it. An analysis of the data indicates that from 

 the standpoint of the number of eggs deposited, Boone County White can be 



