Effect of sugar beet as a trap crop on the population density of Meloidogyne incognita infecting subsequent common dry bean
Effect of sugar beet as a trap crop on the population density of Meloidogyne incognita infecting subsequent common dry bean
M. M. A. Youssef† and W. M. A. El-Nagdi
ABSTRACT
Sugar beet (Beta vulgaris L.) cv. Gazelle was planted under screen house conditions to assess its ability as a trap
crop to reduce population density of root-knot nematode, Meloidogyne incognita on subsequent common dry bean
(Phaseolus vulgaris L.). Treatments were made by removing whole plant or cutting sugar beet above the surface of
soil in each pot 6, 12, 18, 24, 30 and 36 days after nematode inoculation. The population density of root-knot
nematode as indicated by the number of galls and egg-masses on roots of sugar beet increased gradually as
influenced by the time of gathering. Root-knot nematode started to lay egg-masses after the 18th day to the 24thday
till the end of experiment. On subsequent common dry bean, root-knot nematode significantly (p≤0.05) reduced on
that cultivar of dry bean as influenced by the tested treatments made to sugar beet i.e. cutting or uprooting (removal)
and time of harvest. In general, the nematode parameters as indicated by the numbers of galls, egg-masses and
hatched juveniles on roots of dry bean and number of juveniles in soil were higher on dry bean plants replacing
cutting sugar beet than those on dry bean plants replacing uprooted sugar beet within the most periods. In contrast,
plant growth parameters were higher for dry bean plants replacing uprooted sugar beet than parameters for plants
replacing cutting sugar beet.
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June 2016
Pakistan Journal of Nematology, Vol. 34, Iss. 1, Pages 01-104
