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Influence of Soil Moisture On Pratylenchus Penetrans

Influence of Soil Moisture On Pratylenchus Penetrans INFLUENCE OF SOIL MOISTURE ON PRATYLENCHUS PENETRANS BY P. F. KABLE 1) and W. F. MAI Department of Plant Pathology, Cornell University, Ithaca, N.Y., U.S.A. The rate of population increase of Pratylenchus penetrans is greatest at moderate soil moisture tensions (pF 2-3) and is least at very low or very high tensions. Soil type influences population growth: the higher the silt and clay content of a soil the greater is the moisture tension necessary for satisfactory population growth. In general, the number of nematodes surviving in soil decreases with increasing moisture and temperature above freezing. No nematodes survive 15 days at -15° C or at 37° C. Soil type influences survival: at tensions of pF 3.7-4.2 survival is much greater in clay than in sandy soil. Nematodes can remain viable at tensions as high as pF 5.0, but death is rapid at pF 5.06. The results show that the half-life concept is of limited value for measurement of nematode viability. In sandy soil some P. penetrans enter alfalfa roots under saturated conditions (pF 0) and under dry conditions (pF 3.0) but entry is greatest under moist conditions (pF 1.8-2.5). The results suggest that only fourth stage larvae and http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Influence of Soil Moisture On Pratylenchus Penetrans

Kable, P.F.; Mai, W.F.
Nematologica , Volume 14 (1): 22 – Jan 1, 1968
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529268X00697
Publisher site
See Article on Publisher Site

Abstract

INFLUENCE OF SOIL MOISTURE ON PRATYLENCHUS PENETRANS BY P. F. KABLE 1) and W. F. MAI Department of Plant Pathology, Cornell University, Ithaca, N.Y., U.S.A. The rate of population increase of Pratylenchus penetrans is greatest at moderate soil moisture tensions (pF 2-3) and is least at very low or very high tensions. Soil type influences population growth: the higher the silt and clay content of a soil the greater is the moisture tension necessary for satisfactory population growth. In general, the number of nematodes surviving in soil decreases with increasing moisture and temperature above freezing. No nematodes survive 15 days at -15° C or at 37° C. Soil type influences survival: at tensions of pF 3.7-4.2 survival is much greater in clay than in sandy soil. Nematodes can remain viable at tensions as high as pF 5.0, but death is rapid at pF 5.06. The results show that the half-life concept is of limited value for measurement of nematode viability. In sandy soil some P. penetrans enter alfalfa roots under saturated conditions (pF 0) and under dry conditions (pF 3.0) but entry is greatest under moist conditions (pF 1.8-2.5). The results suggest that only fourth stage larvae and

Journal

Nematologica – Brill

Published: Jan 1, 1968

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