. Fungous diseases of plants, with chapters on physiology, culture methods and technique . e United States. It was at firstknown (to pathologists at least) in the northeastern states, but itis now common upon several hosts in Missouri, Colorado, andother western states. Cucumbers and melons would seemmost susceptible, although pumpkins and squash may beWeather conditions dc^^^^em to affec^^^erially tdance of this dise^^^^^^^F ^^^^^^ Symptomg^^^llJWr symptoms are single and striking. jressive wilting of the host. If infectioncentral stem, the wilting in the whole vinely. If, however, infection
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . e United States. It was at firstknown (to pathologists at least) in the northeastern states, but itis now common upon several hosts in Missouri, Colorado, andother western states. Cucumbers and melons would seemmost susceptible, although pumpkins and squash may beWeather conditions dc^^^^em to affec^^^erially tdance of this dise^^^^^^^F ^^^^^^ Symptomg^^^llJWr symptoms are single and striking. jressive wilting of the host. If infectioncentral stem, the wilting in the whole vinely. If, however, infection is in the distal parts ofthere is gradual wilting back to the main stem. Thenthe remaining branches promptly show the effect. In the tissuesthere is at the time of wilting very slight, if any, evidence of achange in appearance. In no case is there the development ofodors, or of decay in the usual sense. Infection and spread of the disease appears to result almostwholly through biting insects. The organism is found massedprimarily in the vessels of the xylem. At first the spiral vessels. ado, and * ^m to b^^^H I ^o FUNGOUS DISEASES OF PLANTS I are the seat of action, and later the pitted vessels are late stages of the disease the lesions may be considerable, thebundle system being broken down and cavities formed in the ad-jacent tissues. The lesions are also very noticeable when theorganism has gained entrance to the fruit. The organism is a rod averaging two or three times as longas broad, X -S--/? often adhering in twos, and rapidlymotile only when young (Fig. 37). The rods are readily stained
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