868 EXPERIMENT STATION RECORD. 



the disease has proved a very destructive one for tea seedlings. So far the attack 

 appears to be confined to nurseries, and the disease is believed to be of recent origin. 

 In addition to the tea seedlings, a number of weeds and other plants were attacked, 

 and it is believed that the nematodes have been upon the plantation for a long 

 period, being established on other plants, but only recently have found the young 

 tea plants as suital>le hosts. 



A contribution to the knowledge of slimeflux of trees and some of its 

 causes, W. Holtz [Centbl. Bakl. u. Fur., 2. ALL, 7 {1901), Nos. 4, PP- 113-128; 5-6, 

 pp. 179-189; 7, pp. 229-238; 8, pp. 274-281; 9-10, pp. 338-350, pis. 2, figs. &).— The 

 author gives results of studies made upon Oidium luduigii, and a number of bacteria 

 and other fungi associated with it which are considered the cause of slimeflux on 

 oak, maple, birch, aspen, and other trees. 



The slimeflux of trees, F. Ludwig {Centbl. Bakt. u. Par., 2. Aht., 7 {lHOl), No. 

 9-10, pp. 350-352). — A report is given upon observations made during the years 1899 

 and 1900 upon various forms of slimeflux observed l)y the author. The brown flux 

 is reported as having been observed upon apple trees in various parts of Germany; 

 upon aspen, chestnut, elm, and birch trees in parks; and upon beech and white fir 

 in forests. The author is led to believe from correspondence that this same disease 

 occurs in a number of parts of the United States and other parts of Europe. The 

 white slimeflux of oaks was commonly observed upon oak trees, and there seemed to 

 be some relationship between the phenological conditions of its appearance and that 

 of the first flowering of elder and rye. Observations covering 15 years seem to indicate 

 that the slimeflux and flowering of these plants occur at about the same time. 

 Another form to which the name nmsk flux is given has been observed as Avhite or 

 reddish masses upon linden or maple trees. It is believed to be due to a fusarium 

 form of Nectria aquxductum. 



ENTOMOLOGY. 



Proceedings of the thirteenth annual meeting of the Association of 

 Economic Entomologists ( U. S. Dcpt. Agr., Division of Entomology Bid. 31, n, 

 ser., pp. 103, pis. 2, figs. .^).— At this meeting, held in Denver, Colo., August 23 and 

 24, 1901, the following papers were read: 



Life history studies on the codling moth, C. P. Gillette (pp. 5-20). — The author made a 

 careful study of the life history of this insect with special reference to the determi- 

 nation of the number of broods per year. In Colorado it is found that the time 

 occupied by the codling moth for a complete cycle in the summer averages about 7 

 weeks. In early spring the insect was always found in a larval condition. The 

 larvfe begin to pupate just before the apple blossoms open. The length of the pupal 

 state of the first brood varied from 13 to 68 days. Notes are given on the numbers 

 of larvpe taken by different people under bands of apple trees previous to time of 

 blooming. It was found that a small pei'centage of larvpe seek a place for pupation 

 in the spring after having passed through the winter in a larval condition. At Ft. 

 Collins the earliest moths were captured April 26, and moths continued to appear in 

 breeding cages until July 24. The moths lived but a few days. The earliest time 

 at which eggs were observed was June 9, and by July 21 it was almost impossible to 

 find unhatched eggs. The time between the emergence of the moth and the laying 

 of the eggs averaged 6.7 days and the number of eggs laid by each moth varied from 

 2 to 50, nearly all of which hatched. The incubation period of the eggs was found 

 to be from 6 to 8 days. The earliest date at which larvae of the summer brood were 

 observed was June 28, and the earliest date for the appearance of larvpe of the second 

 brood was August 3. The first brood reached its maximum on July 25 and the sec- 

 ond on September 12. Of 414 larvae taken under bands 353 came to the bands during 

 the night and the remainder during the day. The duration of the larval period 



