Technical Abstract: This is a report on two years of field trials evaluating Metarhizium anisopliae strain MA1200 with oat or rye cover crops in Pembina County, ND. Oat and rye cover crops were main treatments, sub-level treatments were three seeding rates, 0, 1.5, and 3.0 oat-bushel equivalents per acre and at-planting application of MA1200 granular formulation, a postemergence spray of MA1200 spores, at-planting application of Counter 15G, and an untreated check served as sub-sub-level treatments. Cereal cover crops were broadcast immediately before subarbeet planting. Granular Metarhizium and Counter treatments were applied using modified-in-furrow placement. Metarhizium spray application (2x10E13 infective spores per acre, in 7-inch bands at a spray output volume of 30 gallons/ac) was done at peak fly oviposition. Cover crops were killed by herbicide spray when beets were 7 inches tall. Under a moderate level of larval infestation, postemergence Metarhizium sprays integrated with oat provided better root protection against maggot feeding than without a cover; rye combined with Metarhizium granules allowed significantly less root scarring than Metarhizium without a cover crop. The postemergence application of Metarhizium was successfully integrated with both seed rates of rye. These treatment combinations were superior to no-cover plots. Environmental factors appears to impact the integrated programs because oat cover cropping resulted in more consistent root injury reductions when combined with granular Metarhizium in 2002, whereas the liquid formulation of the fungus worked better without in 2003. Combining planting-time granular and postemergence Metarhizium treatments with either oat or rye enhanced SBRM control.