Download Field Crop Diseases Handbook by Robert F. Nyvall PDF

By Robert F. Nyvall

An integral, uncomplicated source at the illnesses of a few of the world's vital box vegetation, box Crop illnesses bargains complete, freestanding descriptions of box crop illnesses from alfalfa sprout rot to wheat streak mosaic. every one description--arranged alphabetically and via causal agent, from micro organism and fungi via nematodes and viruses--gives a fantastic, operating wisdom of a sickness: reason, distribution, existence cycle, indicators, and administration recommendations for greater than 1,600 ailment present in 24 box vegetation.

In maintaining with increasing wisdom and altering methods, this version contains over four hundred extra illnesses than prior variants. also, new details is incorporated for many sickness description. illnesses which are recognized usually by way of multiple identify are cross-referenced.

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A Stemphylium-incited disease in Australia and South Mrica has been attributed to a fungus that more closely resembles S. ) Simmons than S. botryosum. Disease caused by this Stemphylium is more common during cooler weather (see Stemphylium vesicarium leaf spot). DISTRIBUTION: Asia, Australia, Europe, and the United States, particularly the southeastern United States. SYMPTOMS: Spots are small, oval or irregular, dark brown with lighter centers, slightly sunken, and they appear on leaves. Normally they are surrounded by a pale yellow halo.

J. Bot. 49:63-67. Ooka, J. , and Vchida, J. Y. 1982. Cylindrocladum root and crown rot of alfalfa in Hawaii. Phytopathology 72:955 (abstract). BIBLIOGRAPHY 35 Parmeter, J. R 1970. Rhizoctonia solani, Biology and Pathology. University of California Press, Berkeley. Pennypacker, B. W. 1983. Dispersal of Verticillium albo-atrum in the xylem of alfalfa. Plant Disease 67:1226-1228. Pennypacker, B. ; and Hill, R R, Jr. 1984. Resistant alfalfa plants as symptomless carriers of Verticillium albo-atrum.

CAUSE: Cercospora medicaginis Ell. & Ev. overwinters as mycelium in infected plant residue. It may also be seedborne in warm humid areas but the incidence is apparently low under other conditions. During warm, moist weather later in the growing season, spores are produced that are either wind or rainborne to healthy plants. Secondary spread of conidia from infected stem and leaves occurs as plants grow taller and form a natural humidity chamber that prevents drying out. DISTRIBUTION: Africa, Asia, Europe, South America, central and eastern United States.

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