Intracanopy Distribution and Seasonal Abundance of the Yellow Pecan Aphids Monellia caryella and Monelliopsis nigropunctata (Homoptera: Aphididae)1

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Abstract
Results of analysis of 3 years of survey data from an experimental orchard indicated that the mean number of Monelliopsis nigropunctata (Granovsky) or Monellia caryella (Fitch) per leaf does not significantly differ among quadrants or heights of a pecan canopy. Current action thresholds are based on counts of total number of aphids, and results indicated that current scouting practices give a reliable estimate of relative number of aphids per leaf throughout the canopy. Results of analysis showed that the two species' seasonal abundance patterns correspond closely. Egg hatch of both species occurred at bud break. Mean age class composition of populations over the 3 years was similar. Aphid populations, treated as a two-species complex, exhibited a bimodal seasonal abundance pattern. Dates of peak abundance corresponded closely among years when compared as phenological weeks. Sizes of peaks and percent species composition of peaks differed among years and seasons.

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