52 EXPERIMENT STATION EECORD. 



of the disease and the extent of the injnry are much the greater for the bac- 

 terium. 



Some results of recent investigations on the diseases of sugar beets, 

 K. Stormer (Bl. Zuckerrilbcnbau, 15 {1908), /Yos. 10, irp. 2Jf7-2oJi ; 17, pp. 26ff- 

 269; IS, pp. 279-283). — In an address before the general meeting of the Associa- 

 tions of German Sugar Industry, a sunmiary account is given of some of the 

 more recent investigations of sugar-beet diseases and means for their control. 



The blossom blast or blight of cranberries, C. L. Shear {[Proc] Wis. 

 Cranberry Growers' Assoc., 22 {1909), pp. -'/-")• — Attention is called to the blos- 

 som blast or blight, which the author states is due largely to climatic and 

 growth conditions. So far as Wisconsin conditions are concerned, fungi ap- 

 parently have an unimportant part in the destruction of flowers resulting in the 

 blight, cold weather and excessive vegetative growth being more commonly the 

 cause of the ncmsetting of the fruit. 



The failure to set fruit may be avoided by providing a sutHcient storage 

 reservoir to prevent injury from frost, by judicious sanding, and by the selection 

 and production of hardy varieties. Where fungus parasites are present, spray- 

 ing with Bordeaux mixture may be practiced. 



Investigations on black rot of grapes, L. Soursac {Ann. Ecole Nat. Agr. 

 Montpellier, n. ser., 8 {1908), No. 2, pp. 151-160, dgm. 1 ; 8 {1909), No. 3, pp. 

 161-175). — -The primary object of this investigation was to establish the scale 

 of resistance for different species of grapes toward the black rot. The author 

 found that the different species were iniequally resistant, and he classifies them 

 in the increasing order of resistance as follows: Vitis vinifera, V. arizonica, V. 

 californica, V. labrusca, V. rubra, ^'. moriticokt, T. corincea, and 1'. rnpestris, 

 and V. cordifolia, V. riparia, and T". candicans apparently resistant. 



In the formation of hybrids of grapes, the author suggests that attention 

 should be paid to the resistance of the parent plants to disease. Attention is 

 called to the fact that different varieties of the same species also vary in their 

 susceptibility to disease. 



The claims that the leaves can be infected at certain stages of growth only 

 and that there are definite periods of infection were investigated. The author 

 found that the receptivity of young leaves, according to others' observations as 

 well as his own, seem to be checked at some distance from the tip of the shoots, 

 but that the position of the leaf varies with the species and also in the same 

 species with different stages of growth. 



The author believes that the grape is susceptible not only after the periods 

 of receptivity described by others, but also that during these periods the number 

 of leaves which are subject to infection is quite large. 



The difference in resistance to black rot in the different species of the genus 

 Vitis does not seem to be dependent upon the thickness of the cuticle. 



The effect of various fungicides on the flowers of grapes, E. Molz {B^^r. K. 

 LeJiraiist. Wcin, Obst, k. (iortciibau Gcisrnheim, 1907, pp. 316-319). — Experi- 

 ments were conducted with Bordeaux mixture; soda Bordeaux mixture; neu- 

 tral copper acetate; Eclair, which is said to be a mixture of copper acetate, 

 sodium acetate, and sodium sulphate; crystal azuriu, which is a mixture of 

 copper sulphate and ammonia ; and several powder fungicides, among them 

 N()rdlinger's preparations, which consist of 10 per cent copper sulphate vari- 

 ously diluted with talcum, powdered lime, a natural silicate of ahmiinum and 

 magnesia, and kaolin ; Xonnit, and powdered sulphur. Two applications of the 

 fungicides were given to grapes at intervals of about a week, and the flowers 

 and leaves were examined 3 days later. 



Neither the flowers nor the leaves were at all injured by the Bordeaux mix- 

 ture, the Nordlinger preparations, or the powdered sulphur. Some slight injury 



