Agricultural Sciences

A Field Guide to Bacteria (Comstock books) by Betsey Dexter Dyer

By Betsey Dexter Dyer

Even if most folk are acutely aware that micro organism are throughout us, few could wager that they produce such targeted and obtainable indicators. no matter if you’re jogging at the seashore, traveling a zoo or aquarium, shopping, searching for fossils, consuming beer, traipsing via a swamp, or cleansing scum from underneath a dripping outside tap, you’re surrounded through bacterial box marks. You don’t desire a laboratory or fancy apparatus to determine what sort of micro organism are there—this advisor will inform you how.—from the creation micro organism are an vital point of each habitat within which they take place and impact the lives of people, different animals, and crops in lots of methods. Too frequently, we equate "bacterium" with "pathogen" and examine micro organism as issues to prevent. In a desirable consultant ideal for naturalists, scholars, lecturers, and travelers alike, Betsey Dexter Dyer we could the reader recognize that it truly is attainable to watch micro organism with all of the senses. Many teams of micro organism may be simply pointed out within the box (or within the fridge) and not using a microscope. Written for curious souls of every age, A box advisor to micro organism opens our eyes—and noses and ears—to this hidden (or ignored) international round us. important illustrations, together with a hundred and twenty colour pictures, accompany Dyer’s full of life textual content all through.

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Additional info for A Field Guide to Bacteria (Comstock books)

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Secor, G. A. (1994) Management strategies for fungal diseases of tubers. In: Advances in Potato Pest Biology and Management (Eds. G. W. Zehnder, M. L. Powelson , R. K. Jansson, K. V. 155–157. APS Press. The American Phytopathological Society, MN, USA. Bains, P. , Bisht, V. , Benard, D. A. (1996) Soil survival and thiabendazole sensitivity to Helminthosporium solani isolates from Alberta, Canada. Potato Research, 39: 23–30. Phoma exigua Desm. var. exigua POCKET/BUTTON ROT Symptoms HAULM: Pycnidia can be detected on dead or senescent haulm, but there is usually little evidence of infection before senescence.

Where black dot affects tubers, symptoms are B LACK D OT STOLONS: Lesions are also reminiscent of those caused by Rhizoctonia, but microsclerotia are readily formed on stolons. Infected remnants of stolons often adhere to tubers at harvest. 34 D ISEASES , D ISORDERS AND P ESTS OF P OTATOES 39 39 Black dot lesions developing from the stolon. B LACK D OT commonly seen near the stolon attachment end (39). Extensive tuber blemishes may increase tuber respiration, resulting in shrivelling and tuber shrinkage.

Fungal growth within the lesion can vary in colour from white, through yellow to red. In section, lesions caused by F. coeruleum are dark brown in the older part of the lesion, fading to a lighter brown which merges into the healthy tissue (42, 43). F. coeruleum lesions have a more regular edge than those of F. sulphureum. Cavities may develop within lesions with age and may be lined with mycelium and spores. When fully invaded, tubers lose moisture and shrivel to a dried ‘mummy’. Invasion by secondary organisms can occur and confuse identification.

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