Studies of Wireworm Populations: II. Spatial Distribution

摘要: 1. Twenty stations were established in a grass field of 8 acres, and twenty-nine soil samples examined from each station the course 2⅓ years. Wireworms (Agriotes sputator) distributed among twenty non-random manner. 2. In this field, wireworm distribution was correlated to highly significant degree with nine factors (loss on ignition, organic carbon, nitrogen, Lolium, Agrostis, Chilopoda, staphylinid larvae, ants Nematocera) three (altitude, pH Diplopoda). 3. Among these factors, (the content as measured by loss prevalence numbers larvae) found analysis be most significantly distribution. 4. Sixteen set up plot ¼ acre, twenty-one during period 3 The wireworms at markedly throughout sampling period, some being consistently or four times heavily infested others only 5 yd away. 5. Within altitude, depth loam amount moisture 9 depth. It lime soil. Ranunculus prevalent an area low infestation. 6. studied plot, in. important. negatively wireworms. 7. having high populations almost exclusively Agriotes sputator; those about equally A. sputator ‘obscurus-lineatus’. 8. Four square-yard examined, eighty-one quadrats 4 square. square yard, not random independently, but aggregated. 9. Separation collected into size groups showed that largely due small which strongly aggregated . medium-sized larvae less large under different 10. To understand controlling it will necessary consider larval age-groups. 11. Two suggestions are made towards explanation geographical England. 12. Study spatial raises major problems ecology and, particular, illustrates interdependence seasonal succession.