Damage threshold of Meloidogyne arenaria to common bean influenced by dates of planting
Damage threshold of Meloidogyne arenaria to common bean influenced by dates of planting
A.M. Korayem, M.M.M. Mohamed† and S.M. EL-Ashry1
ABSTRACT
Effect of root-knot nematode Meloidogyne arenaria was studied on common dry bean plants under natural
infestation in the field at two different seasons of planting. In the first season, bean was grown in Autumn, 2012
while, the second season in early Spring, 2013. For the first season, the relation between nematode initial population
density and bean yield was significantly negative (r = -0.6). A significant reduction in bean yield (P = 0.05) was
obtained when nematode density was more than 100 J2/200 g soil. While, damage threshold level (DT); nematode
density at which yield begin to decrease; was estimated by 3 J2/200 g soil. For the second season, no significant
relation (P = 0.05) between nematode population density and bean yield was found (r = 0.33). DT was estimated as
22 J2/200 g soil. Total protein and nitrogen element decreased in seeds of infected plants compared with those of
healthy ones.
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June 2015
Pakistan Journal of Nematology, Vol. 33, Iss. 1, Pages 1-114
