656 EXPERIMENT STATION RECORD. 



an account of the experiments conducted in 1896 for the prevention of 

 mildew and anthracnose of cucumbers. Owing to the early destruc- 

 tion of the vines by insects the results are hardly conclusive. The fun- 

 gicides seemed to act to some degree as repellants toward the insects, 

 as the sprayed vines were the last to be destroyed. The leaf blight 

 was prevented to a considerable degree by the fungicides used. The 

 fruit rot was about 5 per cent worse on the plants which were sprayed 

 with the potash solution. 



Experiments with celery (pp. 344, 345). — Negative results are reported 

 on the use of fungicides for the prevention of celery blight, there being 

 no disease manifest on any of the plants. 



Experiments unth peas (pp. 345, 346). — Investigations were conducted 

 for the prevention of the leaf blight (Ascochyta pisi) and mildew (Ery- 

 siphe martii) on peas. A quick growing variety, First of All, was 

 chosen for the trial, the object being to get several successive crops in 

 one season. No apparent effect from blight was found in the first crop. 

 Irrigation materially increased the yield of vines and pods. In the sec- 

 ond cropold seed and new seed from the crop just harvested were planted 

 to the evident advantage of the new seed. Soil treatments of sulphur, 

 corrosive sublimate, carbonate of lime, and copper sulphate were tested 

 with the expectation that they would check the disease coming on 

 the stems near the ground. The best yields were secured where the 

 carbonate of lime was employed. But very slight differences were 

 observed in the amounts of blight on the different plats. On the third 

 crop the effect of Bordeaux mixture in keeping off the diseases from 

 late peas was very evident. 



Experiments with beets (pp. 346-350). — Experiments were conducted 

 for the prevention of some of the fungus attacks of beets, principally 

 Cercospora beticola, which was described in Bulletin 107 of the station 

 (E. S. 11., 6, p. 905). The fungicides were efficient in increasing the 

 yield of the treated plats, although the ammonia-Bordeaux mixture 

 burned the foliage to a considerable degree. 



The identity of the scab upon potatoes and beets was clearly estab- 

 lished by a field inoculation. 



Experiments with sunflowers (pp. 350, 351). — A test was made of fun- 

 gicides for the prevention of attacks of Puccinia tanaceti on sunflowers. 

 Twelve sprayings were given the plats, and it was found that all the 

 fungicides were active in keeping down the fungus. Those plants 

 receiving what was called the ammonia-Bordeaux mixture were almost 

 entirely free from rust pustules. 



A stem blight due to Phlyetcena sp. was noticed on some of the plants 

 and it did not seem to yield to applications of fungicides. An allied 

 species of this fungus has been reported on cosmos. 



Experiments with onions (p. 352). — Tests were made in the greenhouse 

 with sulphur and corrosive sublimate for the prevention of onion smut 

 due to TJrocystis ccpuhc, but no disease appearing in either check or 

 treated lots, the results were negative. 



