Development of Heterodera avenae in susceptible and resistant barley cultivars in relation to larval inoculum and penetration

Inoculum level influenced the susceptible cultivars. More larvae penetrated lower one but when per cent development was ratio changed from 2.9: 1.0 (female: male) at rate of development, both in resistant and and devdoped at higher level compared to taken, reverse was found to be true. The sex 100 level to 1.9: 1.8 at 10,000. There was a trend towards maleness at higher inoculum levels.