DISEASES OF PLANTS. 991 



tracheiphilns, powdery mildew, Ciuised by rUtfimoparn oibt'jisis, tlie 

 cucuinber spot {('Uidosporium cuciimcrium), and anthracnose {Golleto- 

 tricliiim la(jtnarium) arc tlescnbed and preventive remedies suggested. 

 Brief notes are also given on nematode attacks on forced cucumbers, 

 and a pliyilosticta of cucumbers. 



A new leaf blight of muskmelons, wliicli is [)robabIy due to Alter 

 naria hrassicw nigresceiiti, is very briefly described. The fungus caused 

 rather large dead spots on the leaves, followed by dying ami curling 

 under from tips and margins. The disease pronuses to be very injuri- 

 ous, and it is thought that liordeaux mixture if properly applied would 

 l^revent its attacks. Notes are given of a severe attack of watermelon 

 anthracnose ( CoUefotrichum lagenarium). 



Among the tomato diseases mentioned the principal ones are a leaf 

 mold, blight of forced tomatoes, leaf blight (probably referable to 

 SeptorUi Iijcopersici), point rot, and bacterial tomato blight. The leaf 

 mold, which is caused by Gladosporiumfnlvum, is one of the most com- 

 mon diseases of tomatoes under glass, and will i)robably be held in check 

 by the use of Bordeaux mixture or ammoniacal copper carbonate. 



The leaf blight of forced tomatoes described appeared in the station 

 greenhouses in 1895 and reappeared in 189G. The younger leaves show 

 the earliest indications of the disease, and have a drooping appear- 

 ance, with the leaflets turned inward at the margin and with occasional 

 dead areas. The attacked leaves soon die and hang from a more or 

 less drooping leaf stem. The thriftiest and most vigorous plants were 

 apparently as commonly attacked as the others, and later plantings 

 suffered the most. The stems and leaf stalks of the affected plants 

 showed black elongated spots upon them, and the green fruits were 

 marked with brown, irregular spots. In general the leaf symptoms 

 were similar to those caused by nematodes, but examinations f^iiled to 

 show any present. No successful remedial or preventive treatments 

 have been found for this disease. If it should prove to be due to 

 nematodes the usual precautions against these pests are recommended. 



The tomato leaf blight, due to Septorla Iijcopersici, is reported as well 

 as a leaf spot caused by Alternaria solani. 



A rot of tomatoes at the point or blossom end was common in the 

 greenhouse as well as in the gard(ui. Observations seemed to show 

 that this rot is associated with iiisulhcient moisture in the soil. 



A bacterial disease of tomatoes, which is probably the same as that 

 described by K. F. Smith' as due to BucHIuh mlanaccarum, is men- 

 tioned. 



Brief notes are given on anthracnose, black rot, and a disease pro- 

 duced by a species of Fusarium on tomatoes. As yet no careful study 

 .has been made of them. 



White spots on stored tobacco, H. Garman {Knifucky Sfo. niiL 

 6G,pp.3S,3'J). — The author mentions the occurrence of round whitish 



'U. S. Dept. Agr., Division of Vegrlul.lr I'li vsiology ami i'alliolnyy Itiil. IL' (K. S. 

 K., 8, p. 89.5). 



