1. Defining the economic threshold;Headley,1971
2. The economics of pest management;Headley,1975
3. Grass growth in different parts of England in relation to invertebrate numbers and pesticide treatments;Henderson;Journal of the British Grassland Society,1977
4. The control of leatherjackets in grassland by winter pesticide applications;Newbold,1981
5. Economic aspects of pest management strategies and decisions;Southwood,1973