19i!0] HORTICULTURE. 743 



Notching above a bud resulted in nearly every case In more growth for the 

 bud affected than for similar buds situated on untreated twigs. Notching below 

 a bud in every case prevented growth and l^ept the bud dormant. Where notches 

 were made alternately above and below, from base to apex on one-year-old 

 twigs, with the exception of the terminal buds which grew into wood shoots, 

 every bud with a notch underneath remained dormant, and every bud with a 

 notch above grew into a veiy short wood spur. In either case, the effect of 

 notching only extended to the bud adjacent to the notch. 



Temperatures which will damage or kill fruit buds, F. L. Wkst and N. E. 

 EuLKFSEN (Better Fruit, I4 (l'J20), No. JO, pp. IS, i//, fif/. 1). — A contribution 

 from the Utah Experiment Station, comprising a popular summary of the 

 authors' previously noted investigation (E. S. R., 37, p. 344). 



The espalier and fancy fruit, J. Bottn£u (Spalier und Edelobsf. Frankfort 

 on the Oder: Troicitzsch cG Son, 1919, S. ed., pp. IV-\-32'f, fig-t. S30).—A small 

 treatise on the planting, pruning, and cai'e of fruit trees trained to .special forms. 



Report of dusting investigations, W. C. Tkaveus (Trans. Peninsula llwt. 

 Soc. [Del.], 9 (19>0), No. 3, pp. 39-4-'/).— A contribution from the Maryland 

 Agricultural College. Cooperative dusting experiments were conducted in 1919 

 on the Eastern Shore of Maryland, using a dust mixture consisting of 85 per 

 cent sulplmr and 15 per cent lead arsenate in dusting apples, peaches, and 

 strawberries. 



As compared with lime-sulphur spray, dusting was fairly satisfactory in con- 

 trolling insects, but was far from satisfactory in controlling apple disea.ses. 

 It faileil to control peach scab and curculio, but was successful in controlling 

 brown rot. The dust killed the curculio, but not until after they had punctunnl 

 the fruit. The cost of dusting was greater than for spraying, both with apples 

 and peaches. 



Dusting experiments conducted for the control of the strawberry weevil were 

 highly successful and profitable. The 85 per cent sulphur and 15 per cent lead 

 arsenate mixture gave the best results in this work. 



The control of the codling moth and apple scab in Delaware, B. R. Leach 

 and J. W. RoBKRTs (Trans. Peninsula Ilort. Soc. [Del], 1920, pp. lJ,-22).— This 

 report gives the re.sults of experimental work conducted in 1919 by the Bureaus 

 of Entomology and Plant Industry, U. S. Department of Agriculture, in coopera- 

 tion with the Delaware Experiment Station. 



A comparative test of dusting and spraying indicated that the dusting of 

 apples is not advisable in Delaware, since the dust does not control the codling 

 moth or apple scab as efhciently as the spray. The combination of calcium 

 ar.senate and lime sulphur used as a spray controlled the codling moth as well 

 as the arsenate of lead and lime sulphur. In case calcium arsenate is used, 

 however, hydrated lime should be added to avoid injury to the foliage. The 

 spray gun compared favorably with tlie spray rod in the control of the codling 

 moth, and if operated pro])erly good results can be scnrured by its use. A spray- 

 ing schedule, which it is lielieved is best suited for the control of the codling 

 moth and apple scab in Delaware, is given. 



[Report of the] division of horticulture, O. M. Morris (Washington Sta. 

 Bui. 155 (1920), pp. 30-38). — Brief statements are made of progress in various 

 horticultural projects. 



Observations thus far made on the relation of the pollination and proper fer- 

 tilization of apple blossoms to June drop indicate that Inefficient fertilization is 

 a prime cause of June drop. 



Data .secured in orchard cover crop investigations Indicate that permanent 

 cover crops such as alfalfa and clover may be established In orchards without 

 checking the groveth and production of the trees, provided a sufficient water 



