01939naa a2200385 a 450000100080000000500110000800800410001910000160006024501210007626000090019752008750020665000130108165000160109465000170111065000200112765000170114765000120116465000210117665000250119765000200122265000100124265000270125265000260127965000200130565000090132565000200133465300280135465300120138265300120139470000210140670000180142770000190144570000200146477300690148412786932025-07-29       1989    bl uuuu     u00u1 u    #d1 aPOPP, M. P.  aEffects of slash pine phloem nutrition on the reproductive performance of Ips calligraphus (ColeopterabScolytidae).  c1989  aThe density of eggs laid by females of Ips calligraphus was determined in the laboratory at 300C and LD 12:12 in thin phloem bolts cut from 25-year-old slash pine (Pinus elliottii var. elliottii) that had been fertilized at the time of planting with a combination of nitrogen, phosphorus and potassium, or phosphorus alone. Egg density was negatively correlated with female pronotal width (size) and positively correlated with the phloem phosphorus concentration. These 2 variables explained 64% of the variation in egg density. It is hypothesized that altering egg density in response to varying phloem nutrition represents a resource partitioning mechanism that reduces larval competition. These results also suggest that excessive phosphorus fertilization of slash pine could contribute to a build-up in the pest population without the added benefits of stand growth.  aconifers  afertilizers  aforest pests  aforest products  ainsect pests  aInsecta  aIps calligraphus  anitrogen fertilizers  aNPK fertilizers  apests  aphosphorus fertilizers  apotassium fertilizers  astored products  awood  aPinus Elliottii  aAgricultural entomology  abiology  aEffects1 aWILKINSON, R. C.1 aJOKELA, E. J.1 aHARDING, R. B.1 aPHILLIPS, T. W.  tEnvironmental Entomology, Lanhamgv. 18, n. 5, p. 795-799, 1989.