Abstract
Studies of the susceptibility of Avena sp. (oat) to toxaphene suggested that reaction to the chlorinated hydrocarbon insecticide was controlled by a single gene, with susceptibility dominant to resistance. The authors have surveyed the susceptibility of cereal varieties from different parts of the world to toxaphene. Preliminary studies had suggested that susceptibility was evidenced by an inhibition of photosynthetic electron flow. Almost all the barley and oat, and about half the rye, varieties tested were susceptible. In contrast, wheat and maize varieties were with few exceptions resistant. Subsequent studies were confined to one variety of susceptible oat, Blyth.