Diseases of glasshouse plants (1923) Diseases of glasshouse plants diseasesofglassh1923bewl Year: 1923 118 DISEASES OF GLASSHOUSE PLANTS The malady is most destructive under excessively moist conditions, and may be checked by drying the atmosphere by means of suitable ventilation. Dusting with sulphur powders, accompanied by efficient ventilation, will generally effect a control. In Fig. 34. Gummosis of the cucumber caused by Cladosporium cucumerinum : (a) Leaf lesions, (6) fruit lesions, (c) hypha5 and spores, {d) spores. bad cases spraying with hver of sulphur and flour paste is recomme
Diseases of glasshouse plants (1923) Diseases of glasshouse plants diseasesofglassh1923bewl Year: 1923 118 DISEASES OF GLASSHOUSE PLANTS The malady is most destructive under excessively moist conditions, and may be checked by drying the atmosphere by means of suitable ventilation. Dusting with sulphur powders, accompanied by efficient ventilation, will generally effect a control. In Fig. 34. Gummosis of the cucumber caused by Cladosporium cucumerinum : (a) Leaf lesions, (6) fruit lesions, (c) hypha5 and spores, {d) spores. bad cases spraying with hver of sulphur and flour paste is recommended, and in any case diseased fruits should be removed and bmned. GENERAL SURFACE DISEASES Potato Blight of Tomatoes.—The disease of tomatoes caused by Phytojhthora infestans (Mont.) De Bary, universally known as the cause of the late bhght of the potato, rarely attacks tomatoes grown in glasshouses in this country. It is, however, a common disease of outdoor tomatoes, and one may successfully predict its appearance if abundant rain falls in July or August. Indeed, so serious is this disease in wet seasons that the outside tomato crop is frequently ruined, unless regular
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