| the epidemiology of nematodirus battus--is it changing? | natural populations of 3rd-stage nematodirus battus larvae were present on pastures in north wales throughout the year; highest numbers were present in late spring, with smaller peaks occurring in autumn. inter-site variation was observed in the timing and magnitude of these peaks. hatching on experimental plots occurred 2 months to 2 years following deposition of eggs. intraspecfic and inter-site variation occurred in the timing, and inter-site variation occurred in the magnitude, of the mass h ... | 1991 | 2038499 |