DISEASES OF PLANTS. 641 



tho original point of attack (the pails below showing an increase of growth) 

 during (hroo years. A young red maple was also found to have been attacked 

 in like manner and to have been killed above the fwint of contact. 



Eelworni disease (Agr. Gas. Tasmanid, 22 {lUl'i), No. 9, p. SJ/l). — It is staled 

 (liat the nematodes which infest clover also attack oats and several other culti- 

 vated besides many wild plants. They are carried on tool.s, wheels of vehicles, 

 etc., as well as by .Miiuials. the eggs resisting desiccation for a long time. 



It is claimed that turning the land as much as 5 in. deep destroys the nema- 

 todes, also that potassium sulpliate applied to tho bind shortly before sowing 

 the clover seed is safely i)rotective (o the plant during the short period of its 

 susceptibility to nematode attack. 



Maryland plant diseases in 1912, J. B. S. Norton (Rpt. Md. State Hort. 

 Hoc, 15 (1012), pp. 182-188). — After discussing the immediate and later effects 

 of the very cold weather on plants in 1912 and stating that the cool moist sum- 

 mer was favorable to parasitic disease in Maryland, the author lists alpha- 

 betically about 50 plants with parasites observed in connection with each. 



Report of the botanist, E. A. Bessey (Michigan HIa. Rpt. lOlff, pp. 226, 

 227). — Besides brief notes of work regarding some plant diseases, more special 

 mention is made of investigations by J. A. McClintock on Michigan ginseng 

 troubles, particularly those due to nematodes. Golden seal was found susceptil)le 

 to this pest. 



The steam pan laiethod of sterilization was found to give adequate" protection 

 against nematodes. A soil drench of formalin, 1 part to 100, prevented damping 

 off in the beds, and black rot was controlled by a much higher concentration of 

 this agent. 



[Report on work in plant pathology] (New Mexico Sta. Rpt. IHIJf, pp. SO, 

 81). — The principal work carried on in the department of plant pathology has 

 been the studies of the blighting of chili peppers, chlorosis of foliage of orchard 

 trees, studies of diseases of apples, i>ears, and peaches, particularly the powdery 

 mildew of the apple (Podospliccra oxycanthw), and some truck crop diseases, 

 one of which, Fusarium wilt, is said to cause considerable damage to tomato 

 crops. 



The blight of peppers is thought to be influenced by damp weather, as the 

 disease spi'eads much more I'apidly under such conditions than where the season 

 is dry and free from heavy rains. So far no causative organism has been iso- 

 lated. 



In the studies on chlorosis of the foliage of orchard trees, plugging and spray- 

 ing them with 1 per cent solution of ferrous sulphate were compared. The use 

 of the material as a spi'ay was found to benefit the trees greatly. 



Notes, observations and minor investigations on plant diseases, H. S. 

 Jackson (Oregon ma. Bien. Crop Pest and Hort. Rpi. lOlS-lJf. pp. 261-283, 

 fi'js. 15). — Notes are given of observations and investigations on a considerable 

 number of diseases of economic plants due to fungi, etc. 



Fungus diseases of Swedish melons and cucumbers, J. Eriksson (/v. 

 Landthr. Alcad. Ilandl. ocli Tidalcr., 52 (1913), No. J,, pp. 233-253, figs. 9; Mcddel. 

 Centralanst. Fdrsokv. Jordhruksomrddet, No. 76 (1913), pp. 23, figs. 9). — Tho 

 following fungi causing diseases are described and discussed in the paper: 

 Cladosporium cucumerinutn, Cercospora melonis, and CoUctotrichum lagenariiim. 



A Coiatribution to the study of foot rot of cereals, P. Bertii.\ult (Rev. G6n. 

 Bot., 25 />/-i" (IDJ'f), pp. 2D-3-'i). — Reviewing reports and discussions of studies 

 on this disease of cereals, and reporting on his own examination of diseased 

 wheat stems sent in from several portions of France during lOlo. the author 

 states that while he did not find Leptosphicria hcrpotrichoidcs on these speci- 



