. Fig. 39.—Spotted wilt of tomato. (From Ext. Cir. 104.) toes by stunting and killing of plants and in reduced size, quality, and yield of tomatoes. Market, shipping, and canning varieties are suscepti- ble. Many other hosts are attacked by the same fungus, Verticillium alho-atrum, which causes blackheart of apricots, blue stem of raspber- ries, and important diseases of strawberry, potato, and cotton. The chief hope of combating this disease in tomatoes lies in resistant varieties. The problem is complicated by the fact that another serious

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