A few consolidated sources of descriptions and illustrations of plant and soil forms, in particular, are available and should be used along with the taxonomic keys. At best, keys are only attempted short cuts to" the recognition of certain specimens. In all cases check the decisions by referral to descriptions and illustrations of the nematodes. There are some excellent volumes available to workers who do not have access to the necessarily large reprint files of the taxonomist. The
Of eight soybean cultivars tested ‘Pickett’ and ‘Dyer’, were found to be resistant to the reinform nematode, Rotylenchulus reniformis. In the presence of Pickett and Dyer, the soil counts of renifonni nematodes were significantly reduced from an initial 10,000 larvae to less than 500 per pot over a 2.5‐month period. Cultivars resistant to the root knot, Meloidogyne spp., did not possess resistance to the reniform nematode but those resistant to the soybean cyst nematodes, Heterodera glycines, did. Under the conditions of the test, the seed yields of Pickett increased while those of ‘Hood’ decreased when inoculated with reniform nematodes.
Effects of different nematicides on yields of sweetpotatoes and on root-knot nematode (Meloidogyne incognita) damage at two different locations were studied over a period of 3 years. Average yields of marketable size roots were significantly increased on Hartsells fine sandy loam from use of Penphene, D-D, Dowfume W-85, Telone, and Nellite; the increased yield from Furadan was nearly significant. All nematicides reduced the root-knot infection counts on steam-peeled roots and root-knot larvae per pint of soil at harvest. Furadan gave the best nematode control. Average' yields were increased on Alaga sand from use of Penphen, D-D, D-D + SD14647, Vorlex, Furadan, Temik, and Mocap. Average root-knot infection counts and root-knot larvae per pint of soil at harvest were significantly reduced by all nematicides used; the greatest reductions followed applications of Temik, Mocap, Furadan, and D-D + SD14647.
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