158 EXPERIMENT STATION RECORD. [Vol. 43 



The yeai" was an exceedingly unfavorable one for normal results in work 

 with the codlinj;: moth. Its ravages were extremely severe in most of the 

 apple-growing sections of the State, due apparently to the unusually warm 

 summer. 



In work with the western bean beetle (Epilachna comipta), good results 

 were obtained in its control by the use of arsenite of zinc or arsenate of lead. 

 The number of broods in the locality of the station has been deternjined as one 

 and a very small fraction of a second. 



The beet web-worm {Loxostege sticticalis) appeared in unusually lar§,e num- 

 bers in the Fort Collins-Greeley district of northern Colorado during the sum- 

 mer, thousands of acres of sugar beets being eaten to the ground after the tops 

 had grown to the height of 10 or 12 in. While in many of the fields nothing 

 but a few of the stronger midribs of the leaves were left standing, the re- 

 covery of the beets was quite remarkable, so that many of the fields seemed to 

 make almost a full growth of tops. It is thought, however, that the tonnage of 

 beets per acre must have been greatly reduced. Tests of Paris green, calcium 

 arsenate, magnesiimi arsenate, and arsenate of lead showed all to be satis- 

 factory when applied in double the ordinary strengths used for control of 

 ordinary leaf-eating catej-pillars. 



The alfalfa weevil continued to spi'ead in Delta County and has been traced 

 several miles to the south and west beyond the area found to be infested the 

 previous year. One small area of slight infestation was discovered on the 

 mesa two miles west of Montrose. 



Insect investigations, E. N. Cory et ax. {Maryland Sta. Rpt. 1919, pp. 

 LII-LVII). — Brief I'eports are made on the 22 projects relating to insects and 

 their control. 



In control work with the woolly aphis 8 iier cent pine tar creosote emul- 

 sion applied twice a year pro-C'ed efficient in controlling the aphids, and no 

 injuries were caused to the trees except in a few instances where the nature of 

 the soil was such that the creosote and natui*al water were held around the 

 tree practically throughout the year. An annotated list of the Halticini of 

 College Park and vicinity, of which 48 species are recognized, has been pre- 

 pared for publication. 



[Work with cranberry insects, 1917-1919], H. J. Franklin {Massachu- 

 setts Sta. Bui. 192 {1919), pp. 126-13S) .—Thm report of work with insect 

 enemies of the cranberry is in continuation of that for the year 1916 (E. S. R., 

 39, p. 60). 



A lK)g on which the spanworm {Epclis tnmcataria fa.rouii :Miuot) was 

 numerous in 1917 was reflowed for a period of three days commencing June 20,^ 

 and while the moths were either destroyed or driven ashore apparently little 

 or no harm was done to the eggs, for the worms appeared in great numbers in 

 July. They were successfully controlled, however, by a single application of 

 arsenate of lead paste, 6 lbs. to 50 gal. of water. The cranberi-y wot grub 

 {AmpJiicoma xnilpina Hentz) found occasionally in great numbers in the sand 

 covering of bogs, where it works very much likt; the rootworm {Rhahdoiitrrus 44 

 picipes), feeding mainly on the small roots, occasionally destroys large patches 

 of vines. Work with the spittle insect {Clastoptcra vitfata Ball) shows it to 

 be very injurious, and that it ought to be controlled wherever it becomes 

 abundant on a bog. This is readily accomplished by applying blackleaf 40, 1 

 part to 800 parts of water, to which soap has been added. Adults of this 

 species have been reared from eight food plants. The most important parasite 

 of the cranberry tipworm {Dasynenra vaccinii Smith) has been identified by I' 

 Gahan as Ceraphron pallidiventris Ashm. 



