Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Fig. 76. — Fig in well-advanced stage of fruit-rot. Original. considerable damage, causing premature falling of leaves. The rust appears as brown spots upon the leaf. Leaf-blight {Cercospora bol- leana (Thtim.) Speg.). — This blight has been noted in the United States, though l)ut slight attention has been given it. It causes injury similar to that of rust. Other diseases of the fig are: a root-knot due to nematodes; a Rhizoctonia leaf-blight; Southern-blight (Sderotium rolfsii); Cankers due to M
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Fig. 76. — Fig in well-advanced stage of fruit-rot. Original. considerable damage, causing premature falling of leaves. The rust appears as brown spots upon the leaf. Leaf-blight {Cercospora bol- leana (Thtim.) Speg.). — This blight has been noted in the United States, though l)ut slight attention has been given it. It causes injury similar to that of rust. Other diseases of the fig are: a root-knot due to nematodes; a Rhizoctonia leaf-blight; Southern-blight (Sderotium rolfsii); Cankers due to Mac- rophoma, Libertella, and Tubercularia; Limb-blight due to Corticium; Root-rot (Ozonium) and Yellow-rust (Fusarium), Black-smut (Sterigmatocystis) may affect as high as 15 per cent of the fruits in some instances. GUAVA Ripe-rot {Glomerella psidii (G. Del.) Sheldon). — This disease was described from green- house mate- rial collected at Washing- ton, D. C, and after- ward it was reported from Florida and Cali- fornia. The affected fruit shows circular, Fig. 77. — Guava affected with ripe-rot. After Rumsey.
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