Effect of nematode popula non and host types on emergence, penetra non and development of Heterodera avenae¹

Increased emergence of larvae from Heterodera avenae cysts was observed when barley variety resistant to Ludhiana but susceptible to Narnaul populations was planted in soil infested with Narnaul population. Higher penetrations of larvae was observed in barley resistant to both the populations and barley variety resistant to Narnaul but susceptible to Ludhiana populations and planted in soil infested with Narnaul population and also in the latter case when soil was infested with Ludhiana population.