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Distillate flower abscission (PFA) was measured for four cultivars of walnut  (Juglans regia  L.): `Serr', `Sunland', `Howard', and `Chandler'. Mean PFA for `Serr' over 7 years was greater than for the other cultivars and there were no differences among any of the latter. The high PFA potential of `Serr', shown here and earlier, was not expressed in `Sunland', even though both cultivars have one common parent. There was no association of PFA with either of two rootstock. Flowering index did not differ among cultivars and was not related to PFA.

Pistillate Flower Abscission of Walnut—`Serr', `Sunland', `Howard', and `Chandler'