J. L. Townshend

Publications62
h-index11
Citations776
Highly Influential Citations22
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Determining nematode population responses to control agents
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Anhydrobiosis in Pratylenchus penetrans.
Anhydrobiotic survival of Pratylenchus penetrans was compared in several soil moisture regimes. Bodies of anhydrobiotic nematodes were coiled. In slow-dried soils, Vineland silt loam (VSL) and Fox… Expand
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A Modification and Evaluation of the Apparatus for the Oostenbrink Direct Cottonwool Filter Extraction Method1)
The apparatus for the Oostenbrink direct cottonwool filter extraction method was modified for more efficient use of laboratory space. Yields of Pratylenchus penetrans were larger than those of… Expand
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The pathogenicity of Pratylenchus penetrans to celery.
Celery seedlings, grown aseptically in silica sand with plant nutrients, were inoculated with surface-sterilized specimens of the root lesion nematode Pratylenchus penetrans (Cobb, 1917) Filip. &… Expand
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Infectivity of Pratylenchus penetrans on Alfalfa.
The infectivity of Pratylenchus penetrans on alfalfa seedlings cv. Du Pulls was studied. The dense root-hair zone was the preferred zone of penetration by females, males, and third-stage larvae. A… Expand
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Some Weed Hosts of the Southern Root-Knot Nematode, Meloidogyne Incognita 1 )
In a greenhouse experiment 34 species of weeds in 32 genera in 19 families were found to be hosts of Meloidogyne incognita. M. incognita has a much narrower host range among the weeds tested than was… Expand
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THE PATHOGENICITY OF PRATYLENCHUS PENETRANS TO STRAWBERRY
Under aseptic conditions, Pratylenchus penetrans (Cobb, 1917) Filip. & Stek., 1941, was pathogenic to roots of strawberry seedlings. After penetrating the epidermis, the nematodes aligned themselves… Expand
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Ultrastructural Pathology of Cells Affected by Pratylenchus penetrans in Alfalfa Roots.
Cortical parenchyma cells penetrated and fed upon by Pratylenchus penetrans for 48 hours contained only cytoplasmic debris. Proximal cells had an increase in tannin deposits, degenerated… Expand
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INFLUENCE OF SOIL MOISTURE ON APPLE MAGGOT EMERGENCE, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE)
Several authors have observed that Rhagoletis pomonella (Walsh) is usually less prevalent during hot dry summers than during cool wet summers (Rivard 1968). Neilson (1964) showed that the emergence… Expand
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Morphological Observations of Pratylenchus penetrans from Celery and Strawberry in Southern Ontario.
Pratylenchus penetrans was obtained from Premier strawberry in Norfolk County and the Niagara Peninsula and from celery in the latter area. Host affected the dimensions of P. penetrans to a greater… Expand
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