Resistance in Alfalfa to Four Biotypes of the Spotted Alfalfa Aphid1

Publisher Website
Google Scholar
Abstract
Fifty-two experimental alfalfas and cultivars were evaluated for resistance to 4 biotypes (ENT-A, ENT-C, ENT-E, ENT-F) of Therioaphis maculate (Buckton) in greenhouse tests at Tucson, Arizona. Three alfalfas (‘Caliverde’ 65, developed by the University of California at Davis; T-3-12, a new experimental developed jointly by the University of Arizona and Entomology Research Division, ARS, USDA; and UC-64, a new experimental developed jointly by University of California and Entomology Research Division, ARS, USDA) were rated highly resistant, 14 moderately resistant, 13 intermediate, 7 low resistant, 9 susceptible, and 6 highly susceptible. In the analyses, highly significant differences were found in seedling survival. Also, differences among biotypes were highly significant, and the biotypes reacted differentially among and within alfalfas, thus substantiating previous experiments that they are distinct. When the virulence of biotypes was established, ENT-F was found to be the most virulent strain, followed by ENT-E, ENT-A, and ENT-C.

This publication has 0 references indexed in Scilit: