DISEASES OF PLANTS. 51 



Both species of Fusarium have been successfully inoculated into the wild 

 ivy-leaved morning glory, but they have proved not parasitic to eggplants, 

 tomatoes, peppers, clover, Irish potatoes, or several species of Ipomoea. All 

 attempts to produce the stem rot of sweet potato with Nectria ipomcew, which 

 may be commonly found on rotting sweet potatoes in storage, have been unsuc- 

 cessful. 



Recent studies of some new or little known diseases of the sweet potato, 

 J. J. Taubenhaus (I'hijtopatliology, // (,19U), No. 4, pp. 305-320, pis. 3).— This 

 is a detailed account of a paper presented before the American Phytopatho- 

 logical Society (E. S. R., 31, p. 447), in which charcoal rot {Sclerotiiim hatati- 

 cola), a soft rot and ring rot (RMzopus nigricans), vine wilt or yellows. 

 (Fusarium iatatatis), and a new leaf spot (Septoria Mtaticola n. sp.). ai*e de- 

 scribed. 



Wintering of timothy rust in Wisconsin, C. W. Hungerford {Phytopathologi/, 

 If {19U), No. If, pp. 337, 338). — In a brief note the author states that uredo- 

 spores of timothy rust can live over winter and infect the new gi'owth in the 

 spring, and it is probable that the mycelium lives over winter as far north as 

 Madison, Wis. The teleutospores of the timothy rust are said to be not plenti- 

 ful and are found only in shady places, along fences or edges of woods. 



rOrchard diseases and treatments], L. Caesar (Ann. Rpt. Ontario Agr. Col. 

 and Eivpt. Farm, 39 (1913), pp. 28-31). — Part of this report deals with work 

 done in combating fire or twig blight of pears, which was controlled though in 

 an advanced stage; little peach and yellows, which are being rapidly brought 

 under control by carefully inspecting, marking, and destroying diseased trees; 

 apple scab, which was readily controlled by spraying in some parts of Ontario, 

 but scarcely at all in numerous others; and winter injury, which was studied, 

 but will require observation extending through some years. 



A new pomaceous rust of economic importance, Gynmosporangium blas- 

 daleanum, H. S. Jackson (Phytopathology, If (1914), No. 4, pp. 261-270, pis. 2, 

 pg. 1). — This is a detailed account of an investigation previously reported 

 (E. S. R., 31, p. 345). 



A, fruit spot of the Wealthy apple, E. C. Stakman and R. C. Rose (Phyto- 

 pathology, 4 (1914), No. 4, pp. 333-336, pi. 1).—A spot of Wealthy apples is said 

 to have been very prevalent in Minnesota in 1911. It was less widely spread in 

 1912, but in 1913 assumed considerable importance. Only ripe apples seemed 

 to be affected in the field, especially those which have been left too long and 

 were slightly overripe. In cellars spots were found to occur within a short 

 time after storage, in some cases as many as 60 per cent of the fruits being 

 badly affected. While most prevalent on the variety Wealthy, it was found to 

 attack a number of other varieties. 



Careful microscopic examinations made of the spots showed the presence of 

 mycelium which proved to be the mycelium of an Alternaria, Inoculation 

 experiments failed except where the apples had been injured. Even under 

 the most favorable conditions the fungus did not seem to be able to penetrate 

 the unbroken skin. The primary cause of the disease is said to be still a matter 

 of doubt, although the Alternaria occurred in such a large percentage of spots 

 as to indicate that possibly it was associated with the disease, but further 

 study will be necessary before definite conclusions regarding it can be reached. 



An unusual host of Femes fomentarius, J. R. Weir (Phytopathology, 4 

 (1914). No. 4, p. 339). — The author reports the occurrence of this fungus on 

 varieus varieties of apple trees in an abandoned orchard near INIissoula, Mont. 

 F. applanatus or F. leucophwus, as the American form is commonly designated, 

 is said to be more common in the West on cultivated fruit trees. 



