New plant growth regulators, named chloroisosulochrin, chloroisosulochrin dehydrate and pestheic acid, have been isolated from the culture filtrate of Pestalotiopsis theae grown on a Raulin-Thom medium. Their structures have been established by spectroscopic and chemical methods. The biological activities of these compounds have been examined using bioassay methods with lettuce and rice seedlings

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A hithcrto unrecorded Periderminm spccies was found on shoots of Pinus pumila Regel in Hokkaido, Japan. The rust has unbranched and uninucleate germ tubes with pointcd tips. Alternate host plants have not been found. The rust is considered to be a pine‐to‐pine species.

structure structure (organic substances) K 9000 51 -023 Chloroisosulochrin, Chloroisosulochrin Dehydrate, and Pestheic Acid, Plant Growth Regulators, Produced by Pestalotiopsis theae. --(SHIMADA, A.; TAKAHASHI, I.; KAWANO, T.; KIMURA, Y.; Z.

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