TABLE CONTENTS

indicated that M. javanica J 2 populations were reduced in all treated soils compared to the
inoculated control treatment. Populations were increasingly reduced from one to three years
of repeated treatment. Root populations were also consistently reduced in the BQMulch
and Nemacur® treated vines. Yields from treated vines were similar to that of inoculated
vines in one and two consecutive years of treatment but increased significantly following
three consecutive years of treatment. Similarly vines applied with brassica green manures for
three consecutive years produced similar yields to that of uninoculated vines. Starch contents
in roots (% dry weight) of brassica and seed meal treated vines were considerably higher (21-
24%) than that in roots of untreated and inoculated vines (17%) after three consecutive years
of application. The number of treatment years did not affect juice characteristics.
Effect of Enhanced UV-B Radiation on Reniform Nematode
(rotylenchus reniformis linford and oliveira) Populations in Cotton
(gossypium hirsutum l.)
Saravanan, V. & B. Abdul Aleem
Bioinformatics Resources, 259, Linghi chetty Street, Chennai 600 001, TN, India
High density radiation (UV-B) reaching the earth's surface has increased by 6-14% since
1980 and is projected to rise further in the near future. Over the past two decades, several
studies were conducted to evaluate the effects of high density radiation on growth and
development of crop plants. However, few studies have addressed UV-B induced changes in
plant chemistry and their influence on pests such as insects, snails, and nematodes. To
quantify increased UV-B radiation effects on nematode populations, cotton plants were
exposed to several levels of radiation. Plant growth, development, drymatter accumulation,
pigments, and phenolics, along with the number of eggs and nematode numbers in the root
zone, were recorded. We observed increased levels of leaf and root phenolic concentration
with increased levels of UV-B radiation and decreased number of eggs and nematodes in the
root zone. The results of this study can be used to screen cultivars for nematode tolerance.
5 th International Congress of Nematology, 2008 285