Distribution and severity infection of soybean cyst nematode, Heterodera glycines, in Mazandaran and Golestan provinces
2007
Tanha Maafi, Zahra, Iranian Research Institute of Plant Protection
The soybean cyst nematode (SCN), Heterodera glycines Ichinohe, found in most soybean growing regions in the world, is considered the most economically damaging pathogen of soybean worldwide. A survey conducted in the northern provinces Mazandaran and Golestan, the main soybean producing areas in Iran, revealed SCN was wide spread in different localities of these regions. Of the 55 and 88 soil samples collected from soybean fields in Mazandaran and Golestan provinces, 10 (18.8%) and 23 (26%) samples were infested with H. glycines, respectively. The Population densities of cysts ranged from 3 to 310 and 14 to 700 cysts per 250 ml soil in Mazandaran and Golestan provinces, respectively however, the population densities of J2 and eggs ranged from 500-60,000 and 500΅έ100,000 per 250 ml soil. Most of the fields sampled had H. glycines population densities that exceeded of 500 eggs/250 ml soil that can be considered as the damage threshold level. These population densities of H. glycines are likely responsible for some soybean yield reductions.
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