APHELINUS PERPALLIDUS PARASITISM OF MONELLIA CARYELLA POPULATIONS IN FAR WEST TEXAS1
In 1981 and 1982, a survey was conducted to determine the impact of the parasite, Aphelinus perpallidus (Gahan), on populations of the blackmargined aphid, Monellia caryella (Fitch), in far west Texas. Parasitism did have a moderate impact on aphid populations in most of the orchards sampled in El Paso County. In 1981, peak percentage parasitism ranged from 6% in the Fabens orchard to 17% in the El Paso orchard. In 1982 peak percentage parasitism generally increased and ranged from 25% in the El Paso orchard to 30% in the Ysleta and Tornillo orchards. Further information on the phenology of A. perpallidus from each site is presented.
Contributor Notes
1 Approved for publication as TA 20417 by Director, Texas Agricultural Experiment Station, El Paso, TX 79927. Partial assistance for these investigations was provided by BARD Grant No. US-228-80.
2 Respectively, Research Associate and Associate Professor, Texas Agricultural Experiment Station, El Paso, TX 79927.