Natural Increases in Parasitoid and Predator Abundances and a Shift in Species Dominance Point to Improved Suppression of the Sorghum Aphid Since Its Invasion into North America.

sorghi population declined and that there was an overall trend of increasing natural enemy to aphid ratios across the years.

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The highly significant results from each of the twenty contingency tables constructed to analyze the six key natural enemy groups in the first analysis ( Section 3.1 ) strongly indicated that the frequencies of these taxa were not equally represented over the years examined for each location, although they did not provide any information on the contribution to the suppression of individual taxa.

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