Factors influencing populations of Eumargarodes laingi and promargarodes spp. in sugarcane at Bundaberg and derivation of sequential sampling plans
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A survey of the margarodids Eumargarodes laingi Jakubski and Promargarodes spp. in sugarcane was carried out at Bundaberg. E. laingi cyst numbers were influenced by soil type; Promargarodes spp. numbers did not differ between soil types, but there were differences between cultivars. There were more E. laingi and Promargarodes spp. cysts in older crops. The number of times the previous fallow was ploughed and rotary hoed influenced E. laingi numbers, but not Promargarodes spp. numbers. There were fewer E. laingi cysts following a long fallow, but crop rotations did not affect E. laingi numbers. There were trends to lower Promargarodes spp. numbers following a long fallow or a sugarcane-rockmelon rotation. Fields treated with chlorpyrifos (emulsifiable concentrate) had lower numbers of E. laingi than those treated with controlled-release chlorpyrifos; Promargarodes spp. numbers were not influenced by insecticide applications. Soil pH and electrical conductivity, ripping during fallow, type of irrigation, and nematicides used did not affect numbers of E. laingi or Promargarodes spp.