438 NEW JERSEY AGRICULTURAL^ COLLEGE 



the spraying, provided it is done early, in anticipation of the enemy,, 

 that may come with great force when the conditions of warmth and^ 

 moisture prevail. 



THE MILDEW OF THE GRAPE. 



Last year (1900) the mildew was very abundant upon the grape* 

 vine at the time that the plants were in bloom. Photographs wer& 

 taken of canes, flower clusters and leaves, showing the mildew in 

 great abundance. (See last Report, Plate X. ) This year the same 

 vines were watched closely and were sprayed with fungicide, in an 

 attempt to check the growth of the mildew. But no mildew appeared 

 upon the young clusters, canes or foliage until about the first of Sep- 

 tember, when the appearance of the young canes and leaves corre- 

 sponded well with the same parts in the springtime of last year. No- 

 mildew was met with upon the clusters, which, at that time, were 

 maturing the fruit. 



It is remarkable that the results of the two years should be so 

 different. This leads to a study of the conditions surrounding the 

 plants for the two seasons. It is seen that the rainfall was somewhat 

 unusual for the period under consideration, there being nearly nine 

 and a half inches (9.43) for August to 4.23 for same month of the 

 previous year. This does not, however, explain the non-appearance- 

 of the mildew in the spring, when the rainfall did not differ much 

 for the two spring seasons. 



TULIP MOULD. 



A grower of Cape May county made complaint that his tulips were- 

 diseased, and, upon request, sent specimens for examination. The 

 trouble was diagnosed as the Tulip Mould, which is due to a fungus, 

 Botrytis parasitica Cav. Upon this subject Massee'J" states that "Cul- 

 tivated tulips are often killed by a mould, which forms olive-brown^ 

 minutely, velvety patches on the stem, leaves and flowers. At a 

 later stage, smooth, lentil-shaped sclerotia, at first grey, then black, 

 appear, mostly in the outer parts of the bulb, sometimes being so 

 numerous as to form black crusts. Preventive means : When the 

 mould is observed the plant should be taken up and burned, to- 

 prevent the formation of the sclerotia, some of which are oftea 



* Plant Diseases, p. 158. 



