. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. 54 California Agricultural Extension Service [Cir. 119 and these spread to form a dead, brown strip around the edges of the leaf (fig. 26). Although tipburn itself is nonparasitic, ''slime" and gray mold develop from tipburn areas, especially in packed lettuce. Tipburn ap- pears mostly during the warmest portion of the year and is popularly supposed to follow alternating periods of cloudy and hot, bright weather. To avoid tipburn, the planting of lettuce in the various California d
. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. 54 California Agricultural Extension Service [Cir. 119 and these spread to form a dead, brown strip around the edges of the leaf (fig. 26). Although tipburn itself is nonparasitic, ''slime" and gray mold develop from tipburn areas, especially in packed lettuce. Tipburn ap- pears mostly during the warmest portion of the year and is popularly supposed to follow alternating periods of cloudy and hot, bright weather. To avoid tipburn, the planting of lettuce in the various California dis-. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : College of Agriculture, Univ. of Calif.
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