350 EXPERIMENT STATION RECORD. 



nose due to GlceositorUtin nidlicorticis, and offers suggestions for its control, the 

 information being largely based upon Oregon Station Bulletin Wl (E. S. R., 12, 

 J). r»S). In tliat bulletin tlie suggestions for treatment included late summer 

 aud autumn spraying with Bordeaux mixture or other compounds. Based upon 

 subse<iuent observations the author states that he is inclined to believe that the 

 summer sprayings may be omitted and that it is most important to have the 

 trees thoroughly i)rotected by a fungicide during November and December. In 

 order to secure this result he recommends a thorough apiilication of Bordeaux 

 mixture soon after the fruit is gathered, to be followed after the leaves are off 

 the trees with another application of Bordeaux or of lime-sulphur mixture. 



Control of pear scab, R. E. Smith {Nortlnaest Pacific Farmer, 39 (1909), 

 \o. 51, pp. 1, 16). — Attention is called to the pear scab, which is becoming one 

 of the most serious diseases of the pear on the Pacific coast. The author 

 quotes extensively from California Station Bulletin 163 (E. S. R., 16, p. S87), 

 and for the control of the disease he recommends spraying the trees thoroughly 

 In February and March with lime-sulphur mixture or copper sulphate solution. 

 When tlie buds have begun to swell the trees should be sprayed with a strong 

 Bordeaux mixture, and as this is the most important of all the aitplieations, par- 

 ticular effort should be made to have it thoroughly done. After the fruit sets 

 about two sprayings with a 5 : 5 : 50 Bordeaux solution, to which some arsenical 

 may be added, are recommended. 



Diseases of the native plum, W. T. Macoun (Canada Expt. Farms Rpts. 

 1909, pp. 126, 127). — Attention is called to two diseases of the native plum 

 (Prunus nigra), a species extensively cultivated in Ontario and Quebec, where 

 European varieties of plums can not be grown. The diseases are the leaf spot 

 or blight (Cladosporium carpophilum) and plum pockets (Exoascus pruni). 



Experiments have shown that these diseases can be controlled by the thorough 

 application of Bordeaux mixture, and suggestions are given for its use. Where 

 it is necessary to apply the fungicide after the fruit has become of considerable 

 size, ammoniacal copper cai'bonate can be substituted for ordinary Bordeaux 

 mixture, so as to prevent staining of the fruit. 



Some diseases of citrus trees, H. S. Fawcett (Proc. Fla. State Ilort. Soc, 

 22 (1909), pp. 75-88, pi. 3). — Popular descriptions are given of scaly bark, 

 withertip, foot rot, gumming, blight, scab, and smoky fungus, with suggestions 

 for the treatment of the different diseases, so far as definite i-emedies are 

 known. 



Yellow spotting of citrus leaves, B. F. Floyd (Proc. Fla. State Hort. Soc, 

 22 (1909), pp. 88-93, pis. 2, figs. 2). — A disease of citrus trees characterized 

 by a greasy yellow spotting of the leaves is described. Little appears to be 

 known of its history, and it is said that it may almost disappear in a locality 

 aud again appear after an interval. From the evidence at hand it seems that 

 it belongs to the same class as trenching, melauose, dieback, and blight. 



The symptoms of the disease are confined to the leaves, although a single 

 instance has been found where the fruit was spotted. The typical spots are 

 yellowish or golden in color, varying in size, and usually occurring between 

 the main veins. The yellowish or golden color is more noticeable on the upper 

 surface of the leaves, while on the lower surface the spot is often rough and 

 projecting, thereby differentiating it from the yellowing due to other causes 

 with which, it is said, it is frequently confused. 



As yet no definite cause has been found for the disease. While inoculation 

 experiments have given negative results, it is believed from field observations 

 that it is ti'ansmissible to some extent. 



The diseases and insect injuries of coffee, F. C. von Fabek (Ccntbl. Bwkt. 

 [etc.], 2. Abt., 21 (1908), No. -',-G, pp. 97-117, figs. 12; 23 (1909), No. 6-9, pp. 



