Resistance to a peanut-parasitic population of Meloidogyne javanica and an undescribed Meloidogyne sp. in peanut breeding lines selected for resistance to Meloidogyne javanica was examined in greenhouse tests. The interspecific hybrid TxAG-7 was resistant to reproduction of Meloidogyne javanica, M. javanica, and Meloidogyne sp. An Meloidogyne javanica-resistant selection from the second backcro...

Attachment of relatively low numbers of endospores from two isolates of Pasteuria spp. to several species of nematodes was consistently achieved in 2-5 minutes with a centrifugation technique. The rate of attachment of Pasteuria penetrans at 10 endospores/0.1 ml/tube to second-stage juveniles (J2) of Meloidogyne javanica, M. incognita race 1, M. incognita race 3, and M. arenaria races 1 and 2 i...

A simple method for atomic force microscopy (AFM) of nematode cuticle was developed to visualize the external topography of Helicotylenchus lobus, Meloidogyne javanica, M. incognita, and Xiphinema diversicaudatum. Endospores of two isolates of the nematode parasite, Pasteuria penetrans, adhering to M. incognita and X. diversicaudatum were also visualized and measured by this technique. Scanning...

Lectin binding sites on the surface of Meloidogyne incognita Races 1, 2, 3, and 4; M. javanica; M. arenaria Races 1 and 2; and M. hapla Races A and B were determined with lectins conjugated to fluorescein isothiocyanate or colloidal gold. The amphidial exudate, which was demonstrated histochemically to contain carbohydrate, was the principal binding site. Some lectins also bound to the external...

The effect of soil temperature on the expression of resistance in several common bean lines carrying resistance to root-knot nematodes (Meloidogyne spp.) was studied under controlled temperatures in temperature tank and growth chamber conditions. Resistance to M. javanica and M. incognita race 1 in bean lines A315, A328, A445, G1805, and G2618 was stable at 24-30 C. However, there was a signifi...

The relative DNA content of hypodermal nuclei of preparasitic, 2nd-stage larvae was determined cytophotometrically in 19 populations belonging to 13 species of Meloidogyne, Heterodera and Meloidodera. In Meloidogyne hapla, M. arenaria, M. incognita and M. javanica, total DNA content per nucleus is proportional to their chromosome number, indicating that chromosomal forms with high chromosome nu...

Meloidogyne sp. from five pecan (Carya illinoensis) orchards in Texas were distinctive in host range and iszoyme profiles from common species of Meloidogyne but were morphologically congruent with Meloidogyne partityla Kleynhans, a species previously known only in South Africa. In addition to pecan, species of walnut (Juglans hindsii and J. regia) and hickory (C. ovata) also were hosts. No repr...