50 EXPERIMENT STATION RECORD. 



The fungus (.-taising the disease has l)eeii detenuhied as \'nhtfrlhi fntcli \\. sp.. 

 a technical description of which is given. 



Nematodes on grape roots, J. M. Huergo {Rev. Vitivin. Argentina. 3 (1906). 

 Nos. 21, PI). 312-31J,; 22, pp. 32.',-327 ; 23, pp. 339-342; 2',. p. 36J,; -'/ {1901). A'o.s-. 

 2, pp. 25, 26; -'/, pp. 60, 61; 5-6, pp. 19-82). — A description is given of the effect 

 produced by Heterodera rarlicicola on grapevines, and directions are given for 

 distinguishing the work of nematodes from that of phylloxera, with suggestions 

 nf means for comliating nematodes. 



Some tea and rubber diseases, C. Bernard {Bill. Dept. A(/r. Inde.s 'SeerJand.. 

 1907, IS'o. 6, pp. 55, pis. 4)- — Descriptions are given of some fungus and insect 

 injuries to TJiea ussamica, Klckxhi clasticu. and Herra Jtni.silleiislH. 



One iif the most destructive diseases of tea is that caused by Peatalozsia pul- 

 laannn. This fungus attacks the foliage, causing discolored spots on the leaves, 

 which finally turn l)rown. When se^'erely attacked the plant is greatly weak- 

 ened. A study of the fungus indicated its identity with one that causes severe 

 injury to young cocoanut trees. In fact the fungus aii])ears to spread from 

 cocoauut trees to tea plants. In combating this disease attention should be 

 given the centers of infection, and when they are eradicated the attack on tea 

 plants may lie controlled by picking the diseased leaves and an occasional spray- 

 ing with Bordeaux mixture. 



A second disease of tea is that due to Hypoc1inu-<<: their n. sp., a fungus that 

 forms felted mats and strands over the branches and leaves of the plant. The 

 fungus seems to be a saprophyte, but from its abundance causes serious injury. 

 Pruning the shrubs and the frequent application of Bordeaux mixture will hold 

 this fungus in check. 



The third disease of tea plants described is due to (fiiii/nardhi their. It is 

 believed that treatments similar to those recommended for the control of the 

 l)lack rot of grapes will be successful in its control. 



The disease of Kickxia is due to one of the sooty molds {Capiiodliini indiciiin 

 n. sp.) following attacks of scale insects, particularly Leeairliini sp. 



Upon Hevea the author reports the attacks of the larvte of some undetermined 

 borer and a disease of young trees due to mites. 



Bordeaux injury, U. P. Hedrick (Neic York State Sta. Bill 287, i)p. 103-189, 

 pis. 8). — On account of the repeated reports of injury to apples through Sprg,v- 

 ing with Bordeaux mixture, the station undertook investigations in the spring 

 of 1900 to determine the cause of Bordeaux mixture injury, conditions favoring 

 the injury, and means for preventing it. 



It was found that Bordeaux mixture injury is known wherever Bordeaux 

 mixture is used as a fungicide, and that different species of plants are injured 

 in different degrees, peaches, apricots, and Japanese plums ))eing most suscepti- 

 ble to injury, and common plums, quinces, pears, and apples being injured in 

 about equal degree. Varieties of all the above fruits differ in their susceptiliility 

 to injury. 



It appears that the amount of the injury to a given species or variety of fruit 

 will depend upon the specific susceptibility of the plant, the solvent properties 

 of cell sap on the copper hydroxid. the permea))ility of the epidermis of the 

 plant, and the \A-eather conditions following spraving. 



The injury on tlu' fruit appears as small, round, black or brown specks, and 

 later the injured specimens become rough and russeted by reason of a ruptured 

 epidermis and layers of dead corky cells. In badly injured specimens the fruits 

 are more or less distorted thi'ough shrinkage of the injured portions. A 

 microscopical examination of the injured fruits shows the waxy covering and 

 cuticle of the apple to have been largely destroyed, and such epidermal cells as 

 remain have become much thickened and corky in appearance. 



