Soybean Genetics Newsletter


Resistance against the leaf beetles Colaspis sp. (C.occidentalis or near occidentalis according to Dr. R. White, Insect Identification and Beneficial Insect Introduction Institute, Beltsville, MD, USA) and Diabrotica speciosa (Gennar, 1824) were evaluated under greenhouse conditions, utilizing the resistant PI 227,687, two commercial susceptible varieties 'Santa Rosa' and 'Parana', and the two F1 between the PI and these commercial varieties. A free-choice type of test, with five replications, and artificial infestation of field-collected adults, was made and the percentage of leaf area eaten was visually estimated. Tables 1 and 2 show the percentage of leaf area eaten by C.occidentalis and D. speciosa.