Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 Vegetable and Field Crops 175 estimated in California in 1908; in Michigan in 1915 a loss of more than a million dollars. A cut in price of 5 to 10 cents per crate is common when the bunches are only slightly disfigured. The disease occurs on celery, also on parsnip and parsley. In its early stage it consists of leaf spots; in later stages, the infection of the leaf becomes general, numerous black pycnidia are scattered upon all parts and even upon the Fig. 95. — Celery leaf infected with Septor
Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 Vegetable and Field Crops 175 estimated in California in 1908; in Michigan in 1915 a loss of more than a million dollars. A cut in price of 5 to 10 cents per crate is common when the bunches are only slightly disfigured. The disease occurs on celery, also on parsnip and parsley. In its early stage it consists of leaf spots; in later stages, the infection of the leaf becomes general, numerous black pycnidia are scattered upon all parts and even upon the Fig. 95. — Celery leaf infected with Septoria. After Coons. blanched petioles. In extreme cases wilting of the leaves and destruction of the plant follows. After the celery is put in storage the disease may still progress and do great damage, rotting off the leaves and forcing early marketing. Late- blight is often found in the seed bed, and is probably carried by the seed, since the pycnidia are abundant upon the seed- ing stalks and fruit. Seeds should be disinfected and the seed bed rotated. If the disease has been troublesome in preceding years, the
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