560 EXPERIMENT STATION EECOBD. 



The snow-white linden moth, G. W. IIerrick (New York Cornell 8ta. Bui. 

 286, pp. -'fi-S-'f, figs. 5). — Since tlie iutrodiiction of the English sparrow, but 

 little injury appears to have been done by the snow-white linden moth, also 

 known as the elm spanworm, until 1907, when it appeared as a serious pest to 

 forest trees and has since been very abundant and injurious. 



In this bulletin the author deals with its occurrence, injury, danger as a 

 fruit pest, distribution, food plants, life history and habits, natural enemies. 

 and control. It appears to be widely distributed over the middle and eastern 

 parts of the United States and occurs in Canada. The larvse infest a great 

 variety of forest trees, apparently somewhat preferring beech and maple and 

 have been found on elm, linden, chestnut, hickory, ash, apple, birch, and others. 

 The author considers it quite probable that this insect may in the future become 

 of considerable importance as a fruit pe.st. 



The eggs are deposited during the latter part of June and first part of 

 July on the underside of the branches in masses of from 20 to 100 or more 

 and commence to hatch during the latter half of April. Six caterpillars ob- 

 served began spinning their cocoons May 30, June 1, 2, 3, 6, and 7, respectively, 

 changing to pupse about 3 days later. The 6 pupte required from 13 to IG days 

 for their transformation to adults. In regard to parasites the author states 

 that he has bred but a single specimen {Pimpla eonqinsitor) . 



It is thought that the use of arsenate of lead, 3 lbs. to 50 gal. of water, will 

 control this pest on shade trees. 



A chronologically arranged bibliography is appended. 



The celery leaf-tyer, H. J. Quayle (Cal. Cult., 35 (1910), No, 16, p. 371).— 

 A brief account is given of Phhiciwnia fcrrugulis. Paris green in the propor- 

 tion of from 1 to IJ lbs. to 200 gal. of water was found to be the most practical 

 insecticide and is recommended for use. 



Experiments in the storage of seed potatoes, H. M. Lefroy and G. Evans 

 (Agr. Jour. India, 5 (1910), No. 1, pp. 19-28, pi. 1). — The authors repoit investi- 

 gations that were made necessary by attacks of the potato moth (Plitlwrima;a 

 operculella) . This pest attacks stored potatoes freely and has become well 

 established in India where potatoes are grown. 



Cankerworm experiments of 1909, W. H. Goodwin (Ohio State Hort. Soc. 

 Ann. Rpt., .'i3 (1910), pp. 105, 106). — A brief report of banding and spraying 

 experiments. 



Codling moth control in California, C. W. Woodworth (Jour. Econ. Ent., 

 3 (1910), No. 6, pp. Jf70-/f73). — It is shown that the climatic conditions in the 

 Pajaro Valley are such that none of the commercial brands of arsenate of 

 lead containing arsenic acid soluble in ammonia can be safely used. A 

 method of manufacture has been worked out by means of which a saturated 

 lead salt is uniformly obtained. 



The blossoming period in this valley extends over such a long period that the 

 first fruit set usually are so far advanced as to render the poisoning of the 

 calyx cup impossible before half of the buds are open. The Watsonville 

 spraying program, which absolutely ignores the blossom-cup work, usually 

 begins with an application about the time the last blossoms appear, usually 

 long after the calyx lobes of all the fruit that will set have closed. " This 

 spray may be followed by 1 or 2 applications at intervals of a month or C 

 weeks, the number varying with the season and the portion of the valley. . . . 

 The minimum sprayings that give good results in any part of the valley are 

 3, 2 for the first brood and 1 in August, and the maximum is 6, 3 for the 

 spring and 3 in the summer, and except for the early spring applications must 

 be strictly neutral arsenate of lead, one containing no ammonia-soluble arsenic." 



