850 EXPERIMENT STATION RECORD. [Vol.40 



A wither tip of plum trees, H. Wormat.d (Ann. Appl. Biol., 5 (1918), No. 1, 

 pp. 28-59, pis. 3). — The author has made a study of a Monilia found on with- 

 ered leaves and dead twigs of Victoria plum trees in 1916 during a study of a 

 blossom wilt of apple trees which proved to be due to M. cincrca. The fungus 

 on plum was found to be morphologically indistinguishable from that on apple, 

 and is therefore considered a physiological strain of M. cinerea. 



The disease on plum appears to spread from the leaf which is first infected 

 into the shoot, causing it to wilt and die beyond that point. Although only 

 negative results were obtained from inoculations of plum tree leaves with pure 

 cultures of a strain obtained from a withered twig, inoculation of the stigmas 

 was followed in every case by the death of the bloom, and in .some cases the 

 flowering spur was killed and the branch developed a canker. Uninjured plums 

 were not attacked, but conidia applied to wounds produced a brown rot which 

 spread over the fruit, attacking in some cases other fruits with which it was 

 in contact Apple blossoms inoculated with the wither tip strain fell, but did 

 not extend the infection to other parts as in the case of the apple blossom wilt 

 strain of the organism. 



[Grape diseases], L. Havaz (Prog. Agr. et Yit. (Ed. VBst-Centre), 39 (1918), 

 No. 20, pp. 457-.' f 68). — The author summarizes a number of facts in regard to 

 grape downy mildew and appropriate control measures, with observations on 

 grape Oklinm. 



[Grape diseases], L. DegBUIXY (Prog. Agr. rt Yit. (Ed. PEst-Oentre), 39 

 (1918), No. 23, pp. 531-533). — Grape mildew is said to be favored by heavy 

 applications of soluble nitrogenous fertilizers and of farm manures, phosphate, 

 and potash showing little, if any, Influence. The effects of powdered fungicides 

 are also discussed. 



Studies of outbreaks of grape downy mildew in 1915. J. Cafus (Min. Agr. 

 [Fronoe], Ann. Sen. Bpiphyties, ', {1915), pp. 16S-&17, tig*. 19).— This is an 

 elaborate presentation of a large body of information en grape downy mildew. 

 some of which has been noted previously < 1". S. R., 96, p. 650). 



Recent studies on mildew control. L. Havaz (Prog. Agr. rt Yit. (Ed. VEat- 

 Centre), 39 (1918), Nos. 1J,. pp. 313-315; 16. pp. 361-363).— Tests in 1916 with 

 milk of lime at a strength of 3 to 6 per cent are considered to show that this 

 preparation is ineffective as against grape downy mildew, except possibly dur- 

 ing very dry seasons. Iron sulphate at 2 per cent with lime was also ineffective. 

 Mixed preparations, including Bordeaux mixture, gave inconclusive results and 

 are to be tested again. It is said, however, that in every case the copper- 

 arsenic spray was at least as efficacious as the basic copper spray, but addition 

 of the iron salt gave no advantage. 



Tests with copper sulphate in powdered form are said to have shown greater 

 fungicidal efficacy than was shown by that in the liquid form. The powdi 

 form permitted greater ease and economy in application, although it was ap- 

 parently less adherent. 



[Grape] anthracnose, II. E. Laffer (Jour. Dept. Agr. So. Au*t.. 21 [1918), 

 No. 6, pp. 468-411, figs. 7). — Grape anthracnose or black spot {Manginin a»\- 

 pelina) has become prevalent in South Australia owing to the recurrence of 

 favorable conditions and the use of nonresistant varieties. The present article 

 discusses the life history of the fungus, methods of spreading, and varietal 

 susceptibility. 



Black rot, A. Prtnkt (Prog. Agr. et Yit. (E<1. fEst-Centre), $9 (1918), \ 

 pp. 533-51)5). — Besides making comparisons with other grape diseases, such as 

 Oidiuin and downy mildew, the author discusses at greater length black rot 



