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Estimation of yield losses in broad bean due to Meloidogyne arenaria in Egypt

Estimation of yield losses in broad bean due to Meloidogyne arenaria in Egypt

A. M. Korayem1†, M. M. M. Mohamed1 and S. M. El-Ashry2

1Plant pathology & Nematology Department
2Soil and Water Department, National Research Centre, Dokki, Egypt
Corresponding author:


Loss in yield of broad bean grown in sandy soil naturally infested with root-knot nematode Meloidogyne arenaria
was estimated during two successive seasons. Severity of nematode infestation (damage) was assayed at harvest
stage as root-gall indices (GI) based on scale of 1-6 (1= no infection and 6= 100% root galling). In the first season
(2014-2015) relationship between nematode damage and yield of broad bean was negative, however no significant
reduction in growth and yield (p= 0.05) was obtained at all nematode root gall indices. Correlation coefficient
between nematode damage and yield was low, 0.38 in case of pod yield and 0.40 in case of dry seeds. In second
season (2015-2016), both pods and dry seeds yield were significantly reduced by 10.6% and 15.2%, respectively at
severe infestation (GI=6). Also correlation coefficient between nematode and yield was 0.92 in case of nematodepod
yield and 0.91 in case of nematode-seed yield. Seed contents viz., proteins, carbohydrates, zinc and copper
decreased at severe infestation in the second season, while in the first season quality of seeds was not affected.

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Pakistan Journal of Nematology


Pakistan Journal of Nematology, Vol. 41, Iss. 2, Pages 101-194


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