Insecticides evaluated for lettuce root aphid control
AuthorsNick C. Toscano
Marvin J. Snyder
Carlton S. Koehler
George C. Kennedy
Authors AffiliationsNick C. Toscano is Extension Entomologist and Associate in the Experiment Station, University of California, Riverside; Ken Kido is Staff Research Entomologist, U. C., Riverside; Marvin J. Snyder is Farm Advisor, Santa Barbara County; Carlton S. Koehler is Urban Pest Management Specialist and Horticulturist, U. C., Berkeley; George G. Kennedy is Assistant Professor and Entomologist, North Carolina State University, Raleigh; Vahram Sevacherian is Assistant Professor and Statistician, U. C., Riverside.
Hilgardia 31(4):4-5. DOI:10.3733/ca.v031n04p4. April 1977.
The lettuce root aphid, Pemphigus bursarius L., can cause considerable damage to crops of summer head lettuce. Its primary host is the Lombardy poplar, Populus italica var. nigra. The aphids, or “stem mothers,” which hatch in the spring from eggs that have overwintered on the poplar, cause hollow, flask-shaped galls to develop on the leaf petioles (fig. 1). The stem mother becomes enclosed within the gall, where it matures and gives rise to between 100 and 250 young.
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