. Fig. 26.—Lettuce tipburn. tricts is so regulated as to avoid having crops mature during very hot weather. Summer lettuce is grown in the cooler coast districts like Salinas and Guadalupe rather than in the interior valleys. Strains or varieties of lettuce have been developed which are considerably resistant, though not immune, to this disease. New York Number 515 is one of the most popular of these. ,,^^ ^^^^ ^ ^ MELONS See''Cucurbits" (p. 45) MUSHROOM" Brown Blotch.—Dark-brown patches develop on the surface of af- fected mushrooms. These spots, caused by Phytomonas Tolaasii, are u
. Fig. 26.—Lettuce tipburn. tricts is so regulated as to avoid having crops mature during very hot weather. Summer lettuce is grown in the cooler coast districts like Salinas and Guadalupe rather than in the interior valleys. Strains or varieties of lettuce have been developed which are considerably resistant, though not immune, to this disease. New York Number 515 is one of the most popular of these. ,,^^ ^^^^ ^ ^ MELONS See''Cucurbits" (p. 45) MUSHROOM" Brown Blotch.—Dark-brown patches develop on the surface of af- fected mushrooms. These spots, caused by Phytomonas Tolaasii, are usually not very deep and may be covered with slimy bacterial growth. 1^ For further information on mushroom culture and diseases see: Lambert, E. B. Mushroom culture in the United States. U. S. Dept. Agr. Cir. 251:1-35. 18 figs. 1932.
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Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
