1340 The Vegetable Industry in New York State 



crop rotation. Do not put pea straw on land where peas are to be 

 grown. The disease is introduced into fields with manure where 

 pea vines are fed, but the disease germs are killed where the vines 

 are used as silage. Use seed from disease-free crops. Blackish 

 brown spots on seed are a sure indication of the disease. 



tomato 



Blight (Phytophthora infestans DeBary). The potato blight 

 fungus occasionally attacks tomatoes, producing a similar blight. 

 Spraying with bordeaux, 5-5-50, will check the disease and is 

 advisable when it appears. Systematic spraying, as for potatoes, 

 probably would not be profitable. 



Leaf Mold (Cladosporium fulvum Cke.). Yellow and dead 

 areas, covered on the lower surface by an olivaceous mold, appear 

 in the leaves. This is primarily a greenhouse disease. Thorough 

 spraying with bordeaux, 5-5-50, every ten days is usually recom- 

 mended. Spraying has, however, not proved generally satisfac- 

 tory. The disease can be largely avoided by keeping the tomato 

 foliage and the greenhouse atmosphere as dry as possible. 



Leaf Spot (Septoria lycopersici Speg.). Small angular dead 

 spots occur in the leaves eventually causing them to dry and fall. 

 Stems and fruits are also spotted. Three or four applications 

 of bordeaux, 5-5-50, early in the season are said to control it. 



Blossom End Rot. The blossom ends of half grown and larger 

 fruits become black and more or less sunken. The nature of the 

 disease is not fully known. Various soil conditions, including 

 a sudden decrease in water supply, favor it. Varieties are said 

 to differ in susceptibility. 



