36 EXPEEIMENT STATION KECORD. [Vol.35 



had made a little better growth than the crown-sail infected stock. A collec- 

 tion of varieties of pears was set out in the spring of 1912 to determine the 

 influence of fertilizers and cultural methods on the development and spread of 

 the pear blight. Of these varieties a pear of the Garber tj'pe, belonging to the 

 ryriis sinrs'iH gi-oiip and secured from the eastern section of South Carolina, 

 was found to he i»ractically immune to the blight! This pear is slightly superior 

 to the Kieffer in quality. 



Observations made on the flowers of a number of Elberta peach seedlings 

 confirmed previous observations reported by Hedrick (E. S. R., 29, p. 424) with 

 reference to the relation of the color of the inside of the corolla cup and the 

 color of the flesh of the peach. Deep orange corolla cups gave yellow flesh 

 peaches ; liglit yellow or green corolla cups gave green or white flesh peaches. 



An investigation of the cause of partial or entire self-sterility existing among 

 certain varieties of pecans has shown that the varieties can be divided into 

 two distinct groups based on the floral charactin- of the catkins of the staminate 

 flowers. The two most important differences between these two groups from 

 an economic standpoint are the difference in the viability of the pollen and the 

 difference between the time the pollen is shed and the time the pistillate flower 

 l)ecomes receptive. The pollen of one group was found to be approximately 

 three times as viable as that of the other group and the pollen was shed at 

 approximately the same time that the pistillate flowers became receptive. In 

 the other group the difference in time between the sliedding of the pollen and the 

 receptive stage of the pistillate flower ranged from 6 to 13 days. These ob- 

 servations indicate that a certain number of early blooming varieties should 

 be interplanted with those varieties in which the pollen is late in developing. 



A large number of crosses between the black and white fruiting varieties of 

 Rotundifolia gi'apes showed that black is dominant to white and that white is 

 a pure recessive, thus indicating that white or light fruiting vines may be 

 produced by pollinating the flowers of Scupi^ernong vines with pollen from 

 white male vines. Studies thus far made of the microspoi-e development of 

 Vitis rotundifolia in order to ascertain the cause of self-storility in these 

 grapes have shown that the microspores functioned normally in both male and 

 female through the tetrad stage. Following this stage the pollen from the 

 self-sterile varieties shows signs of degeneration, 



A B C of veg'etable gardening', E. E. Rexford {Neio York and London: 

 Harper & Bros., 1916, pp. 116). — A popular treatise on the culture of vegetables 

 and small fruits. 



Sj)raying programs for the small home orchard and fruit garden, H. A. 

 CossAKu and W. J. Green {Mo. Bui. Ohio Sta., 1 (1916), No. 4, pp. lOS-107).—- 

 This comprises abridged spraying programs for the treatment of orchard and 

 small fruits. The programs are prepared with special reference to the owners 

 of small orchards. 



Spray formulas for tlie town lot, P. Thayer (Mo. Bnl. Ohio Sfn., 1 {1916), 

 No. Jf, pp. llJf-116). — The author has here perfected a set of spray formulas 

 adapted for use in the small fruit garden where only a few trees and bushes are 

 to be sprayed. Wherever possible measui'cs are given permitting of the ready 

 preparation of small amounts of spray materials. 



Culture of cabbage, J. W. Wellington {New York FIfatc Sta. Circ. If 8 {t916), 

 pp. 5). — This circular contains concise directions for growing cabbage, including 

 instructions for the control of diseases and insect pests and a list of the more 

 important varieties. 



New or noteworthy fruits, IV, U. P. Hedrtck {Nctv York State Sta. Bui. 

 414 {1916), pp. 3-10, plH. 5).— In continuation of a previous bulletin (E. S. R., 

 33, p. 238) the author describes the best recent fruit introductions as tested 



