By Stuart Wale, Bud Platt, Nigel D. Cattlin
Covering crucial pathogens, this guide offers transparent, concise descriptions of the indicators and cycles of ailments and problems, and the pests that regularly prey on potato plants, their distribution and significance, and recommendation on their keep watch over. The textual content is illustrated with a few 235 tremendous colour images of affected vegetation to assist within the swift and exact id of disorder. It presents a realistic reference for execs and scholars concerned with potato creation, dealing with, and garage worldwide.
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Extra info for Diseases, Pests and Disorders of Potatoes: A Colour Handbook
Hide, G. A. (1995) Effects of fungicides on the growth and conidial germination of Colletotrichum coccodes and on the development of black dot disease of potatoes. Annals of Applied Biology, 126: 437–447. Read, P. , Hide, G. A. ) Hughes) and its effects on the growth and yield of potato plants. Annals of Applied Biology, 127: 57–72. , Loria, R. (1994) Response of Colletotrichum coccodes to fungicides in vitro. American Potato Journal, 71: 455–465. B LACK D OT RICK PETERS 36 D ISEASES , D ISORDERS AND P ESTS OF P OTATOES Fusarium spp.
The disease is sometimes associated with the potato early dying syndrome. Small, black, dot-like sclerotia (microsclerotia) are formed abundantly in stem lesions, particularly late in the growing season, and are visible to the naked eye. Under the microscope, examination of sclerotia reveals acervuli bearing setae, which are diagnostic. Cutting open dried stems often reveals an amethyst coloration inside the vascular cylinder. Sclerotia may form in internal tissues as well. Leaf lesions are mostly associated with hot dry climates where wind-blown sand particles facilitate transport of the pathogen.
As infected plant parts decay, oospores formed previously will be released into the soil. However, potato tubers with eye infections caused by zoospore attack may not rot prior to harvest. Tubers with superficial infections may have viable mycelium and oospores but appear to be healthy when placed in storage, only to rot a few weeks later or remain healthy until planted – resulting in disease initiation at new sites. The pathogen can also be transmitted in storage or during tuber handling periods to healthy tubers which appear sound but carry oospores or mycelium in the skin or eyes from which infections can develop after planting.
Diseases, Pests and Disorders of Potatoes: A Colour Handbook by Stuart Wale, Bud Platt, Nigel D. Cattlin