Plictran (tricyclohexyltin hydroxide) was very effective against the European red mite, Panonychus ulmi (Koch), and the apple rust mite, Aculus schlechtendali (Nalepa), when applied at the pink bud stage of apple bud development. Plictran as a summer spray was not so effective because a small number of phytophagous mites survived. Plictran, however, is low in toxicity to the predaceous phytoseiids Metaseiulus occidentalis (Nesbitt) and Typhloseiopsis sp. near arboreus (Chant), and these predators increased on the surviving phytophagous mites. Because of this selective action, Plictran is a very promising acaricide for use in integrated mite control programs.

Tetrastichus inferens, new species reared from Sesamia inferens Walker on sugar cane from Tainan, Taiwan, is described and illustrated.

Electrophysiological recordings are taken from the antennae of eastern spruce budworm males. These respond to crude pheromone extracts from the females. The pheromone receptors are located along the length of the antennae.

A method of producing radioactive eggs of the flea beetle Altica carduorum Guér. is described. Adult beetles were fed on young thistles (Cirsium arvense (L.) Scop.) into which P32 had been incorporated via the roots. Feeding was continued until the females had reached four and the males five levels of radioactivity. The effects on oviposition, total egg production, viability of the eggs, and longevity of the beetles were studied. The results indicate that a calculated body content of 0.03 μc P32 in the females would be optimal where large numbers of labelled eggs are required.