RAPD analysis of somaclonal variants derived from embryo callus cultures of peach.

Peach [Prunus persica (L.) Batsch] regenerants from cv 'Sunhigh' embryo no. 156, regenerants obtained from cv 'Redhaven' embryo no.

Factors Influencing Emergence of Juveniles from Cysts of Heterodera zeae.

Several factors were studied to determine their effects on hatch and emergence of second-stage juveniles (J2) from cysts of Heterodera zeae. The optimum temperature for emergence of J2 from cysts of H. zeae was 30 C.

A method for recovery and counting of nematode cysts.

A technique was developed in the early 1980's for recovery and quantification of Heterodera glycines (soybean cyst nematode) cysts from soil and soybean roots. Cysts were collected on sieves and counted on lincd filter paper. This technique could be applied to other particles of similar dimension and density.

Optimal Levels of Meloidogyne incognita Inoculum for Infection of Tomato and Peach in Vitro.

Penetration of second-stage juveniles (J2) of Meloidogyne incognita into tomato root explants and in vitro propagated peach plantlet roots were compared. Five inoculum levels were used: 25, 50, 75, 100, and 200 J2 for tomato; and 50, 100, 200, 500, and 1,000J2 for peach. The greatest root penetration into tomato was 30% at the 75 J2 level, but the maximum penetration into peach roots was only 8% at the 200 J2 level.

Plant and soil nematodes: societal impact and focus for the future.

Plant and soil nematodes significandy impact our lives. Therefore, we must understand and manage these complex organisms so that we may continue to develop and sustain our food production systems, our natural resources, our environment, and our quality of life. This publication looks specifically at soil and plant nematology.