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Table 1 Assumptions within the POPP-Corn model

From: Prediction of pest pressure on corn root nodes: the POPP-Corn model

Model process Assumption
Root growth Root emergence depends on temperature and water content at sowing depth whereas root development in terms of appearance of new root segments and root mass only depends on the average soil temperature and is independent of water content
  The only process causing root density decline is active larval feeding and root mortality caused by pruning
  Root segments are not directly connected to another
  Root growth along the z-axis does not differ with distance from the seedling
Oviposition Sowing of the crop without additional tillage does not change the egg distribution in the soil
  Egg distribution in the soil is normally distributed from the centre of the furrow towards the row when no-tillage occurs
  There is uniformity in the position of row and furrow within the field between seasons
Larval movement Larvae only move when they forage. There is no movement when root density at their location is sufficient to supply their feeding
Pest development Male and female immature stages of the corn rootworm develop at the same rate up to pupation
  Developmental rates for all life stages are definite, and variations in development derive only from differences in temperature and food availability throughout the soil profile
  Developmental baseline temperatures for all life stages, except for eggs, are constant and do not vary with location, as has been observed for egg development
Pest survival Mortality for 1st instar larvae only depends on foraging success and has no time-dependent component (in contrast to all other life stages)
Larval feeding Larvae within one patch share the local food available equally if not enough food is available to fully satisfy the hunger of all