654 EXPERIMENT STATION RECORD. 



selves vei'y satisfactorily. Where the trees have been blown down, but not 

 uprooted, they are sprouting freely and the roots from the sprouts appear to be 

 forcing their way through the trunk of the parent tree into the ground beneath, 

 hence it is believed that the increase in the number of trees in the plantations 

 will be considerable. 



Cooperative forestry work for 1908, W. J. Green and L, H. Goddard {Ohio 

 tita. Circ. l), pp. J). — In this circular a general outline is given of the co- 

 operative forestry work which the station proposes to undertake in 1908, 

 together with a blank form to be used by any farmer of the State who desires 

 to cooperate with the station. 



DISEASES OF PLANTS. 



Report of assistant plant pathologist, H. S. Fawcett (Florida Sta. Rpt. 

 1907, pp. XLIII-LII, pJs. 3, figs. 3). — The principal investigations I'eported are 

 studies on the scaly bark, gumming and scab of citrus fruits, the fungi para 

 sitic on the white fly, peach diseases, i)ecan mildew, etc. 



The scaly bark disease of citrus trees seems to be a new disease, and while 

 si)ecimens of diseased lemons and fruit of sweet oranges were received at the 

 station ?> years before, it was not until in liX)fi that a study of the disease was 

 undertaken. So far as present information goes this disease seems to be con- 

 lined almost entirely to the sweet orange. The trees when badly infested 

 present the general appearance of having been neglected and poorly fertilized. 

 The leaves are usually small and yellow, and the trunks and larger limbs bear 

 large scaly areas. The bark and older limbs show ruptured scales. On the 

 smaller l)ranclies and younger woods the areas become definitely defined. At 

 first the diseased area is of a lemon color, changing later to a rusty brown. In 

 these areas the epidermis becomes lirittle and cracks open, forming scales or 

 flakes, as is the case on the older limbs. The cause of this disease has not yet 

 been definitely determined. 



Citrus scab and gumming are described and suggestions given for their 

 control. 



Among the parasites of the white fly, descriptions are given of two species of 

 Aschersonia, ^1. flnro-ritrina and A. alryrodrs. Cultures are being prepared of 

 both these fungi with the idea of using them in si)raying white-fly infested trees. 

 A third species of Aschersonia (.1. turbinata) has been found to be parasitic 

 on the wax scale. 



An account is given of pecan mildew, in which it is stated that the crop was 

 practically destroyed by the fungus Micros phwra aini. Spraying experiments 

 showed the possibility of controlling this disease, but it would probably be 

 impracticable on large trees. Since the fungus is carried over on the dead 

 leaves and fallen nuts, the author recommends the collection and burning of 

 all trash and the cultivation of the orchard in the winter season, if practicable. 



A brief description is given of a disease of roselle, due to Micros pliwra sp., 

 in which the Oidium stage of the mildew occurs abundantly on the leaves, 

 petioles, and stems, giving the plant the appearance of having been dusted with 

 lime or flour. 



Report of the horticulturist [on plant diseases], G. AV. Warren and Jennie 

 A. VooRHEES {tieic Jersey Stas. Rpt. 1906, pp. 224-236) .—This report contains 

 an account of the bacterial blight of pear trees, " cloudiness " of pears, brown 

 rot of plums, spraying experiments for the control of San Jose scale, the spray- 

 ing of apples, pears, eggplants, tomatoes, and cantaloupes, the spraying of 

 tomatoes and strawberries in bloom, methods of making Bordeaux mixture, 

 and a description of stock solutions of copper sulphate. 



